code no: rt32035 r13 set - 1 iii b. tech ii semester ... · pdf fileiii b. tech ii semester...

||''|'''|''|'|''''||

Code No: RT32035

III B. Tech II Semester Regular Examinations, April - 2016

HEAT TRANSFER

(Mechanical Engineering)

Time: 3 hours Max. Marks: 70

Note: 1. Question Paper consists of two parts (Part-A and Part-B)

2. Answering the question in Part-A is compulsory

3. Answer any THREE Questions from Part-B

(Heat transfer data book allowed) *****

PART –A

1 a) How does heat transfer differ from thermodynamics? Is it true to say that heat transfer is

essentially thermodynamics with rate equations added?

[4M]

b) What is lumped system analysis? When is it applicable? [4M]

c) Mention some of the areas where free and forced convection mechanisms are

predominant.

[3M]

d) How is the friction factor for flow in a tube related to pressure drop? [3M]

e) Distinguish between mechanisms of filmwise condensation and dropwise condensation. [4M]

f) How does an enclouser with a small hole in it behave as a black body? [4M]

PART -B

2 A steel pipe (k=72W/m 0C) of 34 mm outer diameter and 2mm radial thickness carries

dry saturated steam at 1200C.The pipe has been provided with asbestos insulation

(k=0.3 W/m 0C) to Check and minimize the rate of steam condensation. The pipe is

located in surroundings at 250C.Taking unit length of pipe, Calculate

a) Thickness of asbestos insulation for which the rate of steam condensation is same as

that when the pipe is uninsulated.

b) Mass flow rate of condensation when the above insulation is provided, and

c) Highest rate of condensation and corresponding insulation thickness,

Take surface conductance’s on air-side and steam-side as 13 W/m2 0C and 500 W/m

2

0C respectively and hfg at 120

0C =2300kJ/kg.

[16M]

3 a) Explain how the triangular fin is of the best shape. [6M]

b) Both ends of a 5mm diameter U-shaped copper (k= 300 W/m 0

C) rod are rigidly fixed to

a vertical wall which is at 1200 C temperature. The length of U-shaped rod is 50 cm and

it is exposed to air at 300C.The combined radiative and convective heat transfer

coefficient for the rod is 25 W/m2 0C.Make calculations for the temperature at the centre

of U-shaped rod and the heat transfer.

[10M]

4 Under steady state conditions, the rate of conduction heat transfer through a plane wall

is known to depend upon the length of the heat flow passage, its cross-sectional area,

temperature difference across the faces and thermal conductivity of the wall material.

Through dimensional analysis, establish an expression for the heat flow rate in terms of

other variables.

1 of 2

[16M]

R13 SET - 1

||''|'''|''|'|''''||

Code No: RT32035

5 A steam pipe 6 cm in diameter is covered with 2 cm thick layer of insulation which has

a surface emissivity of 0.92.The insulation surface temperature is 750C and the pipe is

placed in atmospheric air at 250C.Considering heat loss both by radiation and natural

convection, estimate the heat loss from 5 m length of the pipe. Also calculate the overall

heat transfer coefficient and the heat transfer coefficient due to radiation alone.

[16M]

6 a) What do you understand by nucleation in nucleate boiling? Explain subsequent growth

and motion of bubbles.

[8M]

b) Dry saturated steam at atmospheric pressure condenses on the surface of a horizontal

tube of 35 mm diameter. What should be the surface temperature of the tube if the rate

of heat flow is required to be 6x104 W/ m

2? Also, determine the heat transfer coefficient

under these conditions.

[8M]

7 a) Show that the hemispherical black cavity with a flat cover over it emits 50% of radiation

to the surface itself and is absorbed.

[8M]

b) A dead black cylinder of emissivity 0.95 is kept at 950C in a large enclosure at 10

0C.

Find the radiation heat loss per square meter of its surface. What would be radiation loss

become if the cylinder were surrounded by a concentric cylinder with its inner surface of

a brightly polished metal of emissivity 0.10? Take radiation constant σb=5.67x10-8

W/m2 K

4.

[8M]

*****

2 of 2

R13 SET - 1

||''|'''|''|'|''''||

Code No: RT32035


HEAT TRANSFER






(Heat transfer data book allowed) ****

PART –A

1 a) Cite few examples where conduction plays a major role. [4M]

b) How does transient heat conduction differ from steady conduction? [4M]

c) Explain the significance of non-dimensional numbers. [3M]

d) What is critical Reynolds number for flow over a flat plate? On what does it

depend?

[4M]

e) In the design of condensers, which of the two types of condensation is usually

selected? Why?

[4M]

f) What is a solid angle? What is its unit? What is a steragon? [3M]

PART -B

2 a) Derive an expression for heat flow through a composite cylinder taking into account

the film heat transfer coefficients on the inside and outside surface of the cylinder.

Find the log mean area of the cylinder neglecting film heat transfer coefficients.

[10M]

b) A 15cmx18 cm epoxy glass laminate (k=0.26 W/mK) of 0.14mm thickness has 1

mm diameter cylindrical copper fillings (k=386 W/mK) planted throughout the

board with centre-to-centre distance of 3mm.Determine the thermal resistance of the

epoxy board for heat conduction.

[6M]

3 a)

b)

The fin is exposed to air at 250C with a convective coefficient of 22W/m

2

0C.If

thermal conductivity o the fin material is 200 W/m0C, determine the heat

dissipation. Consider 1m width of fin.

To increase the heat dissipation, the following two alternatives have been suggested

with the same material volume.

(i) Split the fin into two fins of 5mm thickness each

(ii) Single fin 5mm thick and 160 mm long Which will be the better choice?

The fins may be considered short with tip insulated.

[16M]

4 a) Explain the Buckingham’s π- theorem for dimensional analysis? What are repeating

variables and how are they selected for dimensional analysis? [10M]

b) Explain the concept of momentum equation? Explain its significance.

1 of 2

[6M]

R13 SET - 2

||''|'''|''|'|''''||

Code No: RT32035

5 Atmospheric air at 250C flows at 50 m/s velocity past a flat plate 0.6 m long with its

surface maintained at 2950C.Under these conditions, the air may be treated as

incompressible. Make calculations for heat transferred to air from the entire plate

length taking into account both laminar and turbulent portions of boundary layer.

Presume unit width of plate and the critical Reynolds number to be 5x105.What

percentage error would be introduced if the boundary layer is presumed to be of

turbulent nature from the very leading edge of plate.

[16M]

6 a) Explain Pool boiling. How does it differ from forced convection boiling? [8M]

b) Dry saturated steam at 1200C saturation temperature condenses on a vertical plate,

100 mm in height and 50 mm in width having a uniform surface temperature of

1000C.Estimate the average condensing film coefficient, heat transfer rate to the

plate and the steam condensation rate.

[8M]

7 a) By using one radiation shield between two surfaces and if all the three surfaces have

the same emissivity, show that the net radiant heat transfer is reduced by 50%.

[8M]

b) Explain the radiant energy exchange between two small gray surfaces. Show that

F12 = ε1ε2.

[8M]

*****

2 of 2

R13 SET - 2

||''|'''|''|'|''''||

Code No: RT32035


HEAT TRANSFER







PART –A

1 a) Define thermal conductivity. What is the difference between thermal conductivity and

thermal conductance?

[3M]

b) List the assumptions made while analyzing the heat flow from a finned surface. [4M]

c) What is meant by dimensional homogeneity? Explain some of its applications. [4M]

d) What do you mean by local and convective differentials? [3M]

e) Discuss the importance of heat exchangers for industrial use. [4M]

f) What is a black body? Give some examples of some surfaces which do not appear

black, but have high values of absorptivities.

[4M]

PART -B

2 A furnace wall comprises two layers: 8 cm of fire clay (k=1.2 W/mK) next to the fire

box and 0.6 cm of mild steel (k=35W/mK) on the outside. The inside surface of brick

is at 900K and the steel is surrounded by air at 300K with an outside surface

coefficient of 5W/m2K.Estimate the heat flux through square meter of furnace wall

and the outside surface temperature of steel. What would be the percentage increase in

heat flux if in addition to the conditions specified eighteen steel bolts of 1.8 cm

diameter pass through the composite wall per square meter of wall area.

[16M]

3 a) Consider a sphere and a cylinder of equal volume made of copper. Both the sphere

and the cylinder are initially at the same temperature, and are exposed to convection in

the same environment. Which do you think will cool faster, the cylinder or the sphere?

Why?

[8M]

b) A short cylindrical aluminum bar of diameter 6 cm and height 3 cm is initially at a

uniform temperature of 1750C.Suddenly the surfaces are subjected to convective

cooling with a h=250 W/m2K into an ambient at 25

0C. Calculate the centre

temperature of the cylinder 1 min after the start of cooling.

[8M]

4 Show by dimensional analysis that data for forced convection may be correlated by an

equation of the form Nu= φ(Re,Pr) Where Nusselt number Nu=(hl/k),Reynolds

number Re (Vlρ/µ) and prandtl number pr=(µCp/k).

1 of 2

[16M]

R13 SET - 3

||''|'''|''|'|''''||

Code No: RT32035

5 a) Air at 200C flowing at 25 m/s passes over a flat plate, the surface of which is

maintained at 2700C.Calculate the rate at which heat is transferred from both sides of

the plate per unit width over a distance of 0.25 m from the leading edge. Properties of

air at 1450C are Pr=0.687,ν =2.8x10

-5 m

2/s and k=3.49x10

-5kW/m K.

[10M]

b) Explain the effect of prandtl number on the temperature gradient in turbulent flow for

a given Reynolds’s number in tubes.

[6M]

6 a) Give a comparison of parallel-flow and counter flow heat exchangers. Why are

counter flow heat exchangers mostly used?

[6M]

b) Water is evaporated continuously at 1000C in an evaporator by cooling 500 kg of air

per hour from 2600C to 150

0C.Calculate the heat transfer surface area required and the

steam evaporation per hour, if the liquid enters at 1000C.Take U0=46W/m

2K and Cp of

air 1.005kJ/kg k. At 1000c, hfg=2257kJ/kg.

[10M]

7 a) Explain how the shape factors are different surfaces evaluated. [6M]

b) The inner sphere of a Dewar flask is of 300 mm diameter and outer sphere is of 360

mm diameter. Both spheres are plated for which ε=0.5.The space between them is

evacuated. Determine the rate at which liquid oxygen would evaporate at -1830C

when the outer sphere temperature is 200C.The latent heat of vaporization of liquid

oxygen is 14.2 kJ/kg.

[10M]

*****

2 of 2

R13 SET - 3

||''|'''|''|'|''''||

Code No: RT32035


HEAT TRANSFER







PART –A

1 a) Why are metals good thermal conductors, While non-metals are poor conductors of

heat?

[3M]

b) What is the utility of extended surfaces? [4M]

c) The expression

k

lh gives the Biot number as well as the Nusselt number. What is

the difference between the two?

[4M]

d) When is the forced convection heat transfer in two systems physically similar? [3M]

e) What is mean by fouling factor? How does it affect the performance of a heat

exchanger?

[4M]

f) Explain how thermal radiation exhibits wave particle duality. [4M]

PART -B

2 a) Derive a three dimensional general heat conduction equation in spherical co-

ordinates for a homogeneous material. Deduce there from an expression for

unidirectional unsteady state system when heat is generated within it at the rate of qg

per m3 of the material.

[10M]

b) A cubical tank of water of volume 1.5m3

is kept at a steady temperature of 650C by a

1kW heater. The heater is switched off. How long does the tank to cool to 500C if

the room temperature is 150C .

[6M]

3 A orange of diameter 10 cm is initially at a uniform temperature of 300C.It is placed

in a refrigerator in which the air temperature is 20C.If the heat transfer coefficient

between the air and the orange surface is 50 W/m2K,determine the time required for

the centre of the orange to reach 100C.Assume the thermal properties of the orange

to reach 100C.Assume the thermal properties of the orange are the same as those of

water at the same temperature (α =1.4 x 10-7

m2/s and k= 0.59 W/mK).

[3M]

b) What is lumped system analysis? When is it applicable?

[6M]

4 a) Show that the resistance R to the motion of a sphere of diameter D moving with

uniform velocity V through a real fluid of density ρ and viscosity µ is given by

R=ρD2V

2f (µ/ρVD) where f stands for a function of

[8M]

b) Explain the Rayleigh’s method for dimensional analysis.

1 of 2

[8M]

R13 SET - 4

||''|'''|''|'|''''||

Code No: RT32035

5 a) Calculate the heat generated in a body of a man if for comfortable living, the body is

to be at 350C whilst the environmental conditions are at 15

0C.The body of the man

may be idealized as a cylinder of 30cm diameter and 160 cm height.

Use the correlation Nu=0.12(Gr Pr)(1/3)

.

[10M]

b) How does the friction factor for turbulent flow through a tube depend on the

Reynolds number?

[6M]

6 Hot oil is to be cooled by water in a one shell pass and eight tube passes heat

exchanger. The tubes are thin-walled and made of copper with an internal diameter

of 14 mm. The length of each tube pass is 5 m and U0 =310 W/m2 K. Water flows

through the tubes at a rate of 0.2 kg/s and oil through the shell at a rate of 0.3 kg/s.

The water and the oil enter at temperatures of 200C and 150

0C respectively.

Determine the rate of heat transfer and the exit temperatures of the water and the oil.

[16M]

7 a) Show that the emissive power of a black body is π-times the intensity of emitted

radiation.

[8M]

b) Determine the heat lost by radiation per meter length of a 75 mm oxidized steel pipe

at 3270 C if

(i) located in a large room with red brick walls at a temperature of 270C

(ii) Enclosed in a 150mm x150mm red brick walls at a temperature of 270C.

Emissivites of oxidized steel and red brick are 0.79 and 0.93

respectively.

[8M]

*****

2 of 2

R13 SET - 4

||''|'''|''|'|''''||


DESIGN OF MACHINE MEMBERS– II (Mechanical Engineering)

TTime: 3 hours Maximum Marks: 70




Design Data book is allowed.

*****

PART –A

1 a) Write a short note on classification of antifriction bearings. [4M]

b) Explain the various types of stresses induced in the connecting rod. [3M]

c) Explain the design procedure of studs size for the cylinder head. [3M]

d) What are the various types of stresses induced in crane hooks? [4M]

e) With the help of sketches, discuss about the various types of belt joints. [4M]

f) State the application of various types of levers. [4M]

PART -B

2 a) Explain the following terms:

i) Static load carrying capacity, ii) Dynamic load carrying capacity

[4M]

b) A journal bearing of 50mm diameter and 80mm long, has a bearing pressure of 6

N/mm2, the speed of the journal is 1000 rpm. The ratio of journal diameter to the

diametral clearance is 1000. The bearing is lubricated with oil, whose absolute

viscosity at the operating temperature of 750C may be taken as 0.015 kg/m-s. The

room temperature is 250C, Determine (i) the amount of artificial cooling required and

(ii) the mass of the coolant oil required, if the difference between the outlet and inlet

temperature of the oil is 100C. the specific heat of the oil is 1900 J/kg/

0C and heat

dissipation coefficient is 500 W/m2/0C.

[12M]

3 a) Design a center crank shaft for a single acting four stroke engine for the following

data:Bore = 200mm, stroke = 300mm, engine speed = 1000 rpm, length of connecting

rod = 600mm, Maximum combustion pressure = 1 N/mm2, the crank shaft carrying

one fly wheel at one end of each journal. Weight of each flywheel = 2 kN, distance

between flywheel and its nearest journal = 150 mm.

Maximum torque is experienced in the crank shaft when the crank angle is 300 from

inner dead center position. Permissible stresses for crank shaft material are 70 N/mm2

in bending, 40 N/mm2 in shear, limiting bearing pressure is 8 N/mm

2. The length to

diameter ratio 1.2 for both crank pin and journal. Assume required data.

1 of 2

[16M]

R13 SET - 1 Code No: RT32033

||''|'''|''|'|''''||

4 Design a cast iron piston for a single acting four stroke diesel engine with the

following data

Cylinder bore = 300mm

Length of stroke = 250mm

Speed = 600 rpm

Brake mean effective pressure = 0.6 MPa

Maximum gas pressure = 4MPa

Fuel consumption = 0.25 kg per BP per h

l/d ratio for bush in small end of connecting rod = 1.5

Assume suitable data if required and state the assumptions made.

[16 M]

5 a) Why Trapezoid cross-section is preferred for crank hook? [6M]

b) A curved bar of rectangular section, initially unstressed, is subjected to bending

moment of 1400 N-m which tends to straighten the bar. The section is 4 cm wide by 5

cm deep in the plane of bending, and the mean radius of curvature is 10 cm. Find the

position of the neutral axis and magnitudes of the greatest bending stress and draw a

diagram to show approximately how the stress varies across the section.

[10M]

6 a) A flat belt is required to transmit 30 kW from a pulley of 1.5m effective diameter

running at 300 rpm. The angle of contact is spread over 11/24 of the circumference.

The coefficient of friction between the belt and pulley surface is 0.3. Determine taking

centrifugal tension in to account, width of the belt required. It is given that the belt

thickness is 9.5 mm. density of belt material is 100 kg/m3 and the permissible working

stress is 2.5 MPa.

[8M]

b) The lead screw of lathe has ACME threads of 50mm outside diameter and 8 mm pitch.

The screw must exert an axial pressure of 2500N in order to drive the tool carriage.

The thrust is carried on a collar 110mm outside diameter and 55mm inside diameter

and lead screw rotates at 30r.p.m. Derive i)the power required to drive the screw, ii)

the efficiency of the lead screw. Assume coefficient of friction of 0.15 for screw and

0.12 for collar.

[8M]

7 a) A pair of parallel helical gears consists of a 20 teeth pinion meshing with a 100 teeth

gear. The pinion rotates at 720 rpm. The normal pressure angle is 200, while the helix

angle is 250, the face width is 40 mm and the normal module is 4 mm. the pinion as

well as gear is made of steel 40C8 (Sut = 600 N/mm2) and heat treated to a surface

hardness of 300 BHN. The service factor and the factor of safety are 1.5 and 2

respectively. Assume that the velocity factor accounts for the dynamic load and

calculate the power transmitting capacity of gears.

[8M]

b) A cranked lever has the following dimensions: Length of the handle = 300 mm,

Length of the lever arm = 400mm, overhang of the journal = 100 mm. if the lever is

operated by a single person exerting a maximum force of 400 N at a distance of 1/3 rd

length of the handle from its free end, find i) diameter of the handle ii) cross section of

the lever arm iii) diameter of the journal.

The permissible bending stress for the lever material may be taken as 50 MPa and

shear stress for shaft material as 40 Mpa.

[8M]

*****

2 of 2


||''|'''|''|'|''''||



Time: 3 hours Maximum Marks: 70





*****

PART –A

1 a) Define the following terms related to rolling contact bearings:

i) Bearing life ii) Reliability.

[4M]

b) Explain the design procedure of a connecting rod big end cap bolts. [3M]

c) Explain the various types of cylinder liners. [4M]

d) Derive an expression for radius of neutral axis of a rectangular cross- section curved

beam.

[4M]

e) Classify the wire ropes, based on the direction of twist. [3M]

f) Define the following

i) Normal pitch ii) Axial pitch

[4M]

PART -B

2 a) State any four advantages of Rolling contact bearings over sliding contact bearings. [4M]

b) Design a full hydrodynamic journal bearing with the following specifications for

machine tool application

Journal diameter = 75mm

Radial load = 10 kN

Journal speed = 1440 rpm

Minimum oil film thickness = 22.5 microns

Inlet temperature = 400C

Bearing material = Babbitt

Determine the length of the bearing and select a suitable oil.

[12M]

3 Design an overhung crank shaft for a 300 X 350 mm single cylinder vertical engine

using following data:

Maximum gas pressure = 2.5 MPa

(L/r) ratio = 4.5

Weight of flywheel cum belt pulley = 10 kN

Total belt pull = 5 kN

Width of hub for flywheel cum belt pulley = 150 mm

The torque on the crank shaft is maximum when the crank turns through 350 from the

top dead center and at this position the gas pressure inside the cylinder is 1MPa. The

belts are in the horizontal direction. Assume suitable data.

[16M]

4 Design a cast iron piston for a single acting four stroke engine for the following data:

Cylinder bore = 100mm, stroke = 125mm, maximum gas pressure = 5 N/mm2,

Induced mean effective pressure = 0.75 N/mm2, mechanical efficiency = 80%, fuel

consumption = 0.15 kg per BP per hour, higher calorific value = 42 X 103 kJ/kg,

speed = 2000 rpm, assume suitable data if required and state the assumptions made.

1 of 2

[16M]


||''|'''|''|'|''''||

5 a) What are the applications of curved beams? [2M]

b) A C-Clamp is subjected to a maximum load of W as shown in fig. if the maximum

tensile stress in the clamp is limited to 140 MPa, find the value of load W.

[14M]

6 a) It is required to select a flat open belt drive for a compressor running at 720 rpm,

which is driven by a 25 kW, 1440 rpm motor space is available for a center distance

of 3m.

[8M]

b) A power screw having double start square threads of 25 mm nominal diameter and 5

mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of

screw collar are 50mm and 20 mm respectively. The coefficient of thread friction and

collar friction may be assumed as 0.2 and 0.15 respectively. The screw rotates at 12

rpm. Assuming uniform wear condition at the collar and allowable thread bearing

pressure of 5.8 N/mm2. Find

i) The torque required to rotate the screw

ii) The stresses in the screw and

[8M]

7 a) A pair of straight teeth spur gears is to transmit 20 kW when the pinion rotates at 300

rpm. The velocity ratio is 1:3. The allowable static stresses for the pinion and gear

materials are 120 MPa and 100 MPa respectively. The pinion has 15 teeth and its

face width is 14 times the module. Determine i) Module ii) face width iii) pitch

circle diameters of both the pinion and gear from the stand point of strength only,

taking into consideration the effect of the dynamic loading. The tooth form factor can

be taken as teethofno

y.

912.0154.0= and the velocity factor

vCv

+

=

3

3 where v is

expressed in m/sec

[8M]

b) State the applications of hand and foot levers. Discuss the procedure for designing a

hand or foot lever.

[8M]

*****

2 of 2


||''|'''|''|'|''''||








*****

PART –A

1 a) What are the commonly used materials for sliding contact bearings? [3M]

b) Explain the various types of crank shafts. [3M]

c) Explain the function of piston rings. [4M]

d) Draw the distribution of stresses in curved beams across the cross section. [4M]

e) Differentiate between differential screw and compound screw. [4M]

f) Define i) Module, ii) Face width. [4M]

PART -B

2 a) Distinguish between “Hydrodynamic bearings” and “Hydrostatic bearings”. [4M]

b) A single row deep groove ball bearing is subjected to a radial load of 8 kN and a

axial load of 3 kN. The shaft rotates at 1200 rpm. The expected life of the bearing is

20000 hours. The minimum acceptable diameter of the shaft is 75mm. select a

suitable ball bearing for this application.

[12M]

3 The following data is given for the connecting rod of a diesel engine: Cylinder bore =

85 mm, Length of connecting rod = 350 mm, Maximum gas pressure = 3 MPa, factor

of safety against the buckling failure = 5, l/d ratio for piston pin bearing = 1.5, l/d

ratio for crank pin bearing = 1.25, Allowable bearing pressure for piston pin bearing

= 13 MPa, Allowable bearing pressure for crankpin bearing = 11 MPa, stroke length

= 140mm, mass of reciprocating parts = 1.5kg, engine speed = 2000 rpm, allowable

stress in the bolts as 90 N/mm2 and in cap as 95 N/mm

2, density of connecting rod =

7800 kg/m3 calculate:

a) Dimensions of the cross section of connecting rod

b) Dimensions of small and big end bearings

c) Nominal diameter of bolts for the cap

d) Thickness of cap and

e) Magnitude of whipping stress.

1 of 2

[16M]


||''|'''|''|'|''''||

4 A cylinder of a four stroke diesel engine has the following specifications:

Brake power = 5 kW

Speed = 600 rpm

Indicated mean effective pressure = 0.5 MPa

Make suitable assumptions and calculate

a) Bore and length of the cylinder liner

b) Thickness of the cylinder liner

c) Thickness of the cylinder head

d) Size, number and pitch of studs.

[16M]

5 a) Derive an expression for radius of neutral axis of a ‘I’ cross- section curved beam. [6M]

b) A central horizontal section of a hook is symmetrical trapezium 60 mm deep, the

inner width being 60 mm and the outer width being 30 mm. Estimate the extreme

intensities of stresses when the hook carries a load of 20 kN. the load line passes at

40 mm from the inside edge of the section and the center of curvature lies in the load

line.

[10M]

6 a) It is required to select a V belt drive to connect a 15 kW, 2880 rpm normal torque A

C Motor to a centrifugal pump, running at approximately 2400 rpm, for a service of

18 hours per day. The center distance should be approximately 400mm. assume that

the pitch diameter of the driving pulley is 125mm

[8M]

b) A vertical two start square threaded screw of a 100 mm diameter and 20mm pitch

supports a vertical load of 18kN. The axial thrust on the screw is taken by a collar

bearing of 250mm outside diameter and 100 mm inside diameter. Find the force

required at the end of a lever of 400 mm long in order to lift and lower the load. The

coefficient of friction for the vertical screw and net is 0.15 and that for collar bearing

is 0.20.

[8M]

7 a) A pair of helical gears is to transmit 15 kW. The teeth are 200 stub in diametral plane

and have a helix angle of 450. The pinion runs at 10000 rpm and has 80mm pitch

diameter. The gear has 320 mm pitch diameter. if the gears are made of cast steel

having allowable static strength of 100 MPa, determine a suitable module and face

width from static strength considerations and check the gears for wear, given σes =

618 MPa

[10M]

b) A foot lever is 1m from the center of the shaft to the point of application of 800N

load. Find i) diameter of the shaft ii) dimensions of the rectangular arm of the foot

lever at 60 mm from the center of the shaft assuming width of the arm as three times

the thickness. The allowable tensile stress may be taken as 73 MPa and allowable

shear stress as 70 MPa.

[6M]

*****

2 of 2


||''|'''|''|'|''''||








*****

PART –A

1 a) Define the terms:

i) Bearing characteristic number ii) Bearing modulus [4M]

b) What are the various types of stresses induced in the crank shaft? [4M]

c) Explain the properties required for the piston materials. [4M]

d) What are the assumptions made in Winkler-Bach Theory? [4M]

e) Name the type of stresses induced in the wire ropes. [3M]

f) Explain about herring bone gear. [3M]

PART -B

2 a) Explain the various types of lubrication. [4M]

b) Select a single row deep groove ball bearing for a radial load of 4000N and an axial load

of 5000N, operating at a speed of 1600rpm for an average life of 5 years at 10 hours per

day. Assume uniform and steady load.

[12M]

3 Design a connecting rod for an IC engine running at 1800 rpm and developing a

maximum pressure of 3.15 N/mm2. The diameter of the piston is 100mm, mass of the

reciprocating parts per cylinder 2.25kg, length of connecting rod 380 mm, stroke of

piston 190 mm and compression ratio 6:1.take factor of safety of 6 for the design. Take

length to diameter ratio for big end bearing as 1.3 and small end bearing as 2 and the

corresponding bearing pressure as 10 N/mm2 and 15 N/mm

2. The density of rod material

may be taken as 8000 kg/m3 and the allowable stress in the bolts as 60 N/mm

2 and in cap

as 80 N/mm2. Assume I cross section for the connecting rod. The elastic limit of

compressive stress is 350 MPa and rankine constant 1/7500. Draw a neat dimensioned

sketch.

[16M]

4 A four stroke diesel engine has the following specifications

Brake power = 5 kW, Speed = 1200 rpm, indicated mean effective pressure = 0.35

N/mm2, Mechanical efficiency = 80%. Determine

i) Bore and length of the cylinder ii) Thickness of the liner

iii) Thickness of the cylinder head iv) Size, number and pitch of studs.

1 of 2

[16M]


||''|'''|''|'|''''||

5 a) Define curved beam? What is the difference with respect to straight beam [4M]

b) A crane hook has a trapezoidal section at A-A as shown in fig. find the maximum stress

at points P and Q

[12M]

6 a) Design a chain drive to actuate a compressor from a 15 kW electric motor running at

1000 rpm. The compressor speed being 350 rpm. The minimum center distance is 500

mm. the compressor operates 16 hours per day. The chain tension may be adjusted by

shifting the motor on sliders

[8M]

b) A nominal diameter of a triple threaded square screw is 50mm, while the pitch is 8 mm.

it is used with a collar having an outer diameter of 100mm and inner diameter as 65mm.

the coefficient of friction at the thread surface as well as at the collar surface can be taken

as 0.15.the screw is used to raise a load of 15 kN. using the uniform wear theory for

collar friction, calculate

i)Torque required to raise the load ii)Torque required to lower the load and

iii)The force required to raise the load, if applied at a radius of 500 mm

[8M]

7 a) Design a pair of spur gears with 200 full-depth involute teeth consisting of a 20 teeth

pinion meshing with a 50 teeth gear. The pinion shaft is connected to a 22.5 kW, 1450

rpm electric motor. The starting torque of the motor can be taken as 150% of the rated

torque. The material for the pinion is plain carbon steel Fe410 (Sut = 410 N/mm2), while

the gear is made of grey cast iron FG200 (Sut = 200 N/mm2). The factor of safety is 1.5.

design the gears based on the Lewis equation and using velocity factor to account for the

dynamic load

[10M]

b) A right angled bell crank lever is to be designed to raise a load of 5 kN at the short arm

end. The lengths of short and long arms are 100 and 450 mm respectively. The lever and

the pins are made of steel 30C8 (Sut = 400 N/mm2). And the factor of safety is 5.the

permissible bearing pressure on the pin is 10 N/mm2. The lever has a rectangular cross

section and the ratio of width to thickness is 3:1. The length to diameter ratio of the

fulcrum pin is 1.25:1. Calculate i) the diameter and length of the fulcrum pin ii) the

dimensions of the cross section of the lever

[6M]

*****

2 of 2


||''|'''|''|'|''''||


INTERACTIVE COMPUTER GRAPHICS (Mechanical Engineering)





*****

PART –A

1 a) List various output devices used in computers. [3M]

b) Derive the transformation matrix for rotation about X&Z axis. [4M]

c) Explain about window to viewport and viewport to window transformations. [3M]

d) What is a closed and open curve? [4M]

e) Explain about visible surface detection. [4M]

f) Explain about backface detection. [4M]

PART -B

2 a) Explain the functioning of a Plasma display system. [8M]

b) Explain various hardcopy output devices. [8M]

3 Explain flood fill algorithm with an example showing stack position at each step. [16M]

4 Demonstrate Sutherland-Hodgeman polygon clipping algorithm with an example. [16M]

5 Derive the blending functions for a Bezier surface 3x3. [16M]

6 Derive the transformation matrix to reflect an object about an arbitrarily selected

plane.

[16M]

7 Write short notes on

a) Animation specification involving accelerations. [5M]

b) Motion specifications in animation. [5M]

c) Homogeneous coordinates. [6M]

*****


||''|'''|''|'|''''||







*****

PART –A

1 a) Explain the difference between random scan and raster scan devices. [3M]

b) Derive the transformation matrix for rotation about X&Y axis. [4M]

c) Explain the cohen-sutherland clipping algorithm. [4M]

d) Explain about wireframe modeling. [4M]

e) Explain the need for concatenation of matrices. [3M]

f) Discuss about motion specification. [4M]

PART –B

2 Explain various input and output devices. [16M]

3 Prove that a uniform scaling (Sx = Sy) and a rotation form a commutative pair

of operations but that, in general, scaling and rotation are not commutative

operations.

[16M]

4 Compare the number of arithmetic operations performed in the Cohen-

Sutherland and the Cyrus-Beck line-clipping algorithms for two different line

orientations relative to a clipping window.

[16M]

5 Determine the blending functions for uniform, periodic B-spline curves of

degree 3.

[16M]

6 Write the depth buffer algorithm and demonstrate with an example. [16M]


a) Key frame systems. [5M]

b) General computer animation functions. [5M]

c) Parallel and perspective projections. [6M]

*****


||''|'''|''|'|''''||







*****

PART –A

1 a) Explain the functioning of CRT monitor. [4M]

b) Derive the transformation matrix for rotation about Y&Z axis. [4M]

c) Explain the liang barsky algorithm. [4M]

d) Write the shortcomings of Bezier curves. [3M]

e) Derive the relation for rotation about XY plane, YZ plane and XZ plane. [4M]

f) Explain about keyframe system. [3M]

PART -B

2 Explain in detail about any four input devices. [16M]

3 Show that transformation matrix for a reflection about the line y = x, is

equivalent to a reflection relative to the x axis followed by 2 counterclockwise

rotation of 90o.

[16M]

4 a) Derive the window-to-viewport transformation equations by first scaling the

window to the SIZE of the viewport and then translating the scaled window to

the viewport position.

[16M]

5 Derive blending functions for a B-spline surface of degree 3x3. [16M]

6 Derive the transformation matrix for scaling an object by scaling factor S in a

direction defined by the directional angles α, β, γ.

[16M]

7 Write short notes:

a) Generation of in-betweens key frames using linear interpolation [5M]

b) Raster animation [5M]

c) Back face detection. [6M]

*****


||''|'''|''|'|''''||







*****

PART –A

1 a) Explain various input devices used. [4M]

b) Explain DDA algorithm. [4M]

c) Explain about viewing function. [4M]

d) Explain about CSG modeling. [3M]

e) Explain about Z buffer algorithm. [4M]

f) Explain about animation sequence. [3M]

PART -B

2 Explain the functioning of any two monitors with applications. [16M]

3 Show that transformation matrix, for a reflection about the line y = -x, is

equivalent to a reflection relative to the y axis followed by a counterclockwise

rotation of 900.

[16M]

4 Carefully discuss the rationale behind the various tests and methods for calculating

the intersection parameters u1 and u2 in the Cyrus-Beck line-cllpping algorithm.

[16M]

5 Explain about any two shading algorithms in detail. [16M]

6 Write scan line algorithm for visible surface detection and explain with an

example.

[16M]


a) Animation specification implementing the acceleration-deceleration calculation. [5M]

b) Computer animation languages. [5M]

c) 3-D clipping. [6M]

*****


||''|'''|''|'|''''||


REFRIGERATION AND AIR CONDITIONING (Mechanical Engineering)





*****

PART –A

1. a) Explain the term ``Tonne of refrigeration ``. [4M]

b) Why in practice a throttle valve is used in vapour compression refrigerator rather than

an expansion cylinder to reduce pressure between the condenser and the evaporator?

[4M]

c) `` A completely odourless refrigerant is not desirable``, discuss the statement. [3M]

d) Discuss the function of absorber in vapour absorption refrigeration system. [3M]

e) What is the difference between wet bulb temperature and thermodynamic wet bulb

temperature?

[4M]

f) Explain the features required for the proper selection of a fan for a given application? [4M]

PART –B

2. a) Draw the schematic of a boot-strap cycle of air refrigeration system, and show the cycle

on T-s diagram.

[6M]

b) In a boot-strap refrigeration system for an aircraft the ambient conditions are 0.225 bar

and -500C. Cooling load estimate is 20 ton refrigeration (20 TR). The speed of the plane

is 1000 km/hr. Ram efficiency is 0.9. the pressure ratio for the main compressor is 3.5

and this bled off air is further compressed in secondary compressor run by cooling air

turbine on a single shaft such that output from turbine is equal to input to the

compressor. The internal efficiency of main compressor as well as secondary

compressor is 0.9, and that of cooling turbine is 0.8. The air from secondary compressor

is cooled by ram air to 500C. The cooling air turbine running the secondary compressor

has its exit pressure of 1 bar. Determine (i) Delivery pressure from the secondary

compressor, (ii) Mass flow rate bled for cooling the cabin, (iii) COP of the system.

[10M]

3. a) Discuss the effect of sub-cooling on COP. Would you desire large sub-cooling and

why?

[6M]

b) A refrigerating plant using CO2 as refrigerant works between 250C and -5

0C. The

dryness fraction of CO2 is 0.6 at the entry of the compressor. Find the ice formed per

day if the ice is formed at 00C and from the water at 10

0C. Quantity of CO2

circulated=10 kg/min. Take relative efficiency=0.6. Take Cp (water) = 4.2 kJ/kg, latent

heat of ice=335kJ/kg.

Temperature 0C Liquid heat

(kJ/kg)

Latent heat

(kJ/kg)

Entropy of liquid

(kJ/kg K)

25

-5

81.25

-7.53

121.6

245.8

0.2513

-0.0419

[10M]

4. a) Describe the working of an evaporative condenser. [7M]

b) Explain the working of following types of evaporators with neat sketches: (i) Shell and

tube evaporator, (ii) Forced convection evaporator, (iii) Shell and coil evaporator.

1 of 2

[9M]

R13 SET - 1 Code No: RT32037A

||''|'''|''|'|''''||

*****

2 of 2

5. a) Draw a neat diagram of lithium bromide water absorption system and explain its

working in major field of applications of this system.

[8M]

b) Derive an expression for the COP of an ideal vapour absorption system in terms of

temperature TG at which heat is supplied to the generator, the temperature TE at Which

heat is absorbed in the evaporator and the temperature TC at which heat is discharged

from the condenser and absorber.

[8M]

6. a) Explain the difference between comfort air-conditioning and industrial air-conditioning. [8M]

b) Define the term `` effective temperature `` and explain its importance in air-

conditioning system. Describe the factors which affect effective temperature.

[8M]

7. a) Describe a centrifugal fan with the help of a neat sketch? [8M]

b) Explain in detail about heat pump circuits? [8M]


||''|'''|''|'|''''||







*****

PART –A

1. a) Discuss the advantages of the dense air refrigerating system over an open air

refrigeration system.

[3M]

b) Under what circumstances the superheating of vapour before coming to compressor is

more objectionable? Give the ways to prevent it.

[4M]

c) Discuss why refrigerants are so selected that evaporator pressures and condenser

pressure are greater than atmospheric pressure.

[4M]

d) Discuss the advantages of vapour absorption refrigeration system over vapour

compression refrigeration system.

[4M]

e) Prove that the partial pressure of water vapour in the atmospheric air remains constant

as long as the specific humidity remains constant.

[4M]

f) What is the function of a fan in an air conditioning system? [3M]

PART –B

2. a) Draw the schematic of a boot-strap evaporative cycle of air refrigeration system, and

show the cycle on T-s diagram.

[6M]

b) A regenerative air refrigeration system for an air plane has to take 30 ton of load, while

the ambient conditions are 0.80 bar and 70C. The ramming action leads to a pressure

rise from 0.8 bar to 1.2 bar at constant entropy. The air is bled off the main compressor

at 4.8 bar. The ram air heat exchanger is 60% effective. The air from the heat

exchanger passes on to cooling turbine. Some portion of the air after expanding in the

cooling turbine passes on to the regenerative heat exchanger reducing the temperature

of the main compressed air to 500C. The cooling air from turbine gets heated to 100

0C

before discharging. The isentropic efficiencies of the compressor and the turbine are

90% and 80% respectively. The cabin is pressurized to 1 bar and maintained at 250C.

Determine (i) The ratio of the air extracted from cooling turbine for regenerative

cooling of the ram air, (ii) Power required for maintaining the cabin at required

condition. Assume the cooling turbine power developed to be used for ram air exhaust

fan.

[10M]

3. a) How does the increase in condenser temperature affect COP? Also explain the

influence of evaporator temperature on COP. Which of the two temperatures have

more influence on COP?

[6M]

b) A refrigerating plant of 28 kW capacity has its evaporation temperature -80C and

condenser temperature of 300C. The refrigerant, R-12 is sub-cooled 5

0C before

entering the expansion valve and the vapour is superheated 60C before leaving the

evaporator coil. The compression of the refrigerant in the compressor is isentropic. If

there is a suction pressure drop of 0.2 bar through the valves; and discharge pressure

drop through the valve of 0.1 bar, determine the C.O.P. of the plant, theoretical piston

displacements/min and the heat removed in the condenser. Solve the problem with the

help of P-h chart. Give also a diagrammatic sketch of this cycle on the T-s chart.

1 of 2

[10M]


||''|'''|''|'|''''||

*****

2 of 2

4. a) Discuss the natural and forced convection types of air-cooled condensers. [8M]

b) Discuss the operation of a capillary tube in a refrigeration system.

[8M]

5. a) Draw a neat diagram of three-fluid system of refrigeration (Electrolux refrigeration

system) and explain its working.

[8M]

b) List out the merits and demerits of thermo-electric refrigeration system over other

refrigeration system. What are the fields of its applications?

[8M]

6. a) Define room sensible heat factor. How room sensible heat factor line is drawn on the

psychrometric chart?

[8M]

b) Explain in brief as to how the human body reacts to changes in temperature of

environment. Also explain the effect of activities on the heat load calculation for

comfort application.

[8M]

7. a) Explain the various types of axial flow fans. [8M]

b) Explain the case of heat pump for heating and cooling cycle with neat diagram. [8M]


||''|'''|''|'|''''||







*****

PART –A

1. a) `` The COP of an air refrigeration cycle is very low, but still a refrigeration system is

most common in the Air craft ``, discuss the statement.

[3M]

b) Mention the advantages of vapour compression refrigeration system over air


[3M]

c) What are essential properties of a good refrigerant? [3M]

d) Define and write the expression for nozzle efficiency in steam jet refrigeration system. [3M]

e) Define the term `bypass` factor used for cooling or heating coil and find the expression

for that.

[5M]

f) Make the arrangement of heat pump when it is used for year round air conditioning. [5M]

PART –B 2. a) Explain the difference between simple air craft refrigeration and boot-strap air


[6M]

b) An air refrigerator working on Bell-Coleman cycle takes air into the compressor at 1 bar

and 268 K. It is compressed in a compressor to 5 bar and cooled to 298 K at the same

pressure. It is further expanded in the expander to 1 bar and discharged to take the

cooling load. The isentropic efficiencies of the compressor and expander are 85% and

90% respectively. Determine : (i) Refrigeration capacity of the system if the air

circulated is 40 kg/ min; (ii) Power required for the compressor; and (iii) C.O.P of the

system.

[10M]

3. a) Draw the vapour compression refrigeration cycle on T-s diagram when the refrigerant is

dry and saturated at the end of compression and find an expression for the C.O.P in

terms of (i) Temperature and entropies; (ii)Enthalpy.

[8M]

b) A vapour compression refrigerator uses R-12 as refrigerant and the liquid evaporates in

the evaporator at -150C. The temperature of this refrigerant at the delivery from the

compressor is 150C when the vapour is condensed at 10

0C. Find the coefficient of

performance if the liquid is cooled by 50C before expansion by throttling. Take specific

heat at constant pressure for the superheated vapour as 0.64kJ/kg K and that for liquid

as 0.94 kJ/kg K. the other properties of refrigerant are as follows:

Temperature

in 0C

Enthalpy in kJ/kg Specific entropy in

kJ/kg K

liquid vapour liquid vapour

-15 22.3 180.88 0.0904 0.7051

10 45.4 191.76 0.1750 0.6921

1 of 2

[8M]


||''|'''|''|'|''''||

*****

2 of 2

4. a) Write short notes on (i) Ozone layer depletion; (ii) Global warming. [8M]

b) Explain the working principle of thermostatic expansion valve with the help of a neat

diagram.

[8M]

5. a) Derive an expression for finding out the mass of motive steam required per kg of water

vapour produced.

[8M]

b) Explain the working principle of vortex tube and explain that the energy exchange

phenomenon in vortex tube is not a violation of second law of thermodynamics.

[8M]

6. a) Explain the procedure to draw a grand sensible heat factor line on a psychrometric

chart. What do you understand by effective room sensible heat factor?

[8M]

b) Why ventilation is required? Explain why different ventilation standards for different

purposes are recommended?

[8M]

7. a) Give the classification of fans and explain the working principles on which they work. [8M]

b) Suggest the different constructional features used in heat pump to improve the overall

EPR.

[8M]


||''|'''|''|'|''''||







*****

PART –A

1. a) What is the need of air conditioning of air-crafts at high altitudes where ambient

temperatures are very low.

[4M]

b) Distinguish between dry and wet compression. What are the advantages at one over the

other?

[3M]

c) What are the desirable properties of an ideal refrigerant? [3M]

d) Define and write the expression for entrainment efficiency in steam jet refrigeration

system.

[4M]

e) With the help of psychrometric chart explain the following process and give the important

characteristic features of adiabatic cooling and humidification process.

[4M]

f) Give the classification of fans. [4M]

PART –B

2. a) Explain refrigeration system using Brayton cycle and show the state points on

Temperature-Entropy diagram considering the irreversibilities.

[8M]

b) A dense air refrigeration machine operating on Bell-Coleman cycle operates between 3.4

bar and 17 bar. The temperature of air after the cooler is 150C and after the refrigerator is

60C. For a refrigeration capacity of 6 tonnes, find: (i) Temperature after compression and

expansion, (ii) Air circulation required in the cycle per minute, (iii) Work of compressor

and expander, (iv) Theoretical C.O.P and (v) Rate of water circulation required in the

cooler in kg/min, if the rise in temperature is limited to 300C.

[8M]

3. a) How does an actual vapour compression cycle differ from that of a theoretical cycle? [6M]

b) A vapour compression refrigeration machine, with Freon-12 as refrigerant, has a capacity

of 12 tonne of refrigeration operating between -280C and 26

0C. The refrigerant is sub-

cooled by 40C before entering the expansion valve and the vapour is superheated by 5

0C

before leaving the evaporator. The machine has a six-cylinder single-acting compressor

with stroke equal to 1.25 times the bore. It has a clearance of 3% of the stroke volume.

Determine (i) Theoretical power required, (ii) C.O.P, (iii) Volumetric efficiency, (iv) Bore

and stroke of cylinder. The speed of compressor is 1000 r.p.m. the following properties of

Freon-12 may be used:

Sat.

temperature 0C

Pressure

bar

Sp.Volume of

vapour, m3/kg

Enthalpy,kJ/kg Entropy,kJ/kg K

liquid vapour liquid vapour

-28 1.093 0.1475 10.64 175.11 0.0444 0.7153

26 6.697 0.0262 60.67 198.11 0.2271 0.6865

Specific heat of liquid refrigerant=0.963 kJ/kg K and specific heat of superheated

vapour=0.615 kJ/kg K.

1 of 2

[10M]


||''|'''|''|'|''''||

*****

2 of 2

4. a) Write short notes on the types of refrigeration compressors. [8M]

b) Explain the working of following types of evaporators with neat sketches:

(i) Flooded evaporator, (ii) Natural convection evaporator.

[8M]

5. a) Explain with the help of a neat sketch, the working of a steam jet refrigeration system. [8M]

b) Explain the working principle of thermo-electric refrigeration system. Compare the

working of different components of thermo-electric refrigeration system with the working

of different components of vapour compression system.

[8M]

6. a) Explain the concept of effective sensible heat factor for room to be air conditioned. How is

it useful to find the ADP for fixed room design condition?

[8M]

b) Define the `` human comfort `` and explain the factors which affect human comfort.

[8M]

7. a) Explain the use of HEAT PUMP for heating and cooling cycle with neat diagram. [8M]

b) Explain in detail different components of fans? [8M]


||''|'''|''|'|''''||


INDUSTRIAL ENGINEERING MANAGEMENT (Mechanical Engineering)





*****

PART –A

1 a) Define Industrial Engineering. [3M]

b) What are the objectives of plant maintenance? [3M]

c) Explain the term PMTS. [4M]

d) State the importance of Quality control. [4M]

e) What is profit sharing? [4M]

f) State Fulkerson’s rule for numbering the nodes in a network. [4M]

PART –B

2 a) Differentiate between production and productivity. [4M]

b) Explain the contributions of Taylor for scientific management and how it leads to the

concept of scientific management.

[8M]

c) State the functions of the management in an organisation. [4M]

3 a) What do you mean by optimal design in plant layout? [4M]

b) Briefly discuss the factors to be considered for the selection of a location for a factory

construction.

[8M]

c) Explain the importance of preventive maintenance in production management. [4M]

4 a) State the differences between method study and work measurement with their

objectives.

[8M]

b) Explain the need and procedure for conducting work sampling study. [8M]

5 a) The following table gives the coded measurement obtained from 20 subgroups of 5

each:

Subgroups No. Statistics Subgroups No. Statistics

1 -1,2,1,0,1 11 0,1,-3,2,1

2 2,0,1,0,1 12 2,1,-1,0,0

3 1,1,0,0,1 13 0,1,-3,2,1

4 2,1,0,-1,0 14 0,0,-1,0,1

5 1,-1,0,0,-1 15 -1,2,1,1,2

6 1,-1,2,0,2 16 1,-1,2,0,2

7 -1,-1,0,-2,1 17 2,1,-1,0,0

8 1,1,2,-1,0 18 2,0,1,0,1

9 2,1,-1,0,0 19 0,1,1,-1,1

10 -2,1,-2,2,1 20 3,-3,1,1,1

i. Construct the �� and R charts and plot the points on the chart

ii. What will be the control limts on �� and R charts for immediate future?

iii. Estimate the value of σ.

1 of 2

[8M]


||''|'''|''|'|''''||

b) Explain in detail about the need of ISO quality systems in an industry.

[8M]

6 a) Why an employee must be rated? State and explain different methods of employee

rating.

[8M]

b) Discuss the fundamental requirements of good financial wage incentive system. [8M]

7 a) What is the need for value analysis of a product? [4M]

b) State the difference between PERT and CPM in project management. [4M]

c) A project has the following time schedule:

Activity Time in weeks Activity Time in weeks

1 – 2 2 4 – 6 3

1 – 3 2 5 – 8 1

1 – 4 1 6 – 9 5

2 – 5 4 7 – 8 4

3 – 6 8 8 – 9 3

3 – 7 5

Construct PERT network and compute

i. TL and TE for each event

ii. Float for each activity

iii. Critical path and its duration

[8M]

*****

2 of 2


||''|'''|''|'|''''||







*****

PART –A

1 a) Define scientific management. [3M]

b) Define plant maintenance schedule. Write down the procedure for scheduling plant

maintenance.

[5M]

c) Explain the importance of Ergonomics. [4M]

d) Explain the term TQM. [3M]

e) What is incentive? How it helps to improve production? [4M]

f) State the modules of ERP. [3M]

PART –B

2 a) State the role of an Industrial Engineer in shop floor. [4M]

b) Explain the tools that are used in Industrial engineering for solving managerial

problems.

[8M]

c) Describe the importance of management in an Organization. [4M]

3 a) State the principle of plant layout. [3M]

b) Explain various types of plant layouts with their relative advantages over other types. [8M]

c) Explain the different types of maintenance system followed in a continuous process

Industry.

[5M]

4 a) Explain the steps followed in method study of job process. [8M]

b) What is process Chart? Explain different types of process chart with relevant

sketches.

[8M]

5 a) Construct (��) and R-charts for the following information and state whether the

process is in control. For each of the following, (��) has been computed from a

sample of 5 units drawn at an interval of 1 hour from an ongoing manufacturing

process.

S.

No.

X1

(10 am)

X2

(11 am)

X3

(12 noon)

X4

(1 pm)

X5

(2 pm)

1 10.02 10.15 9.85 10.02 9.97

2 9.97 9.98 9.96 9.92 10.05

3 10.08 10.02 10.1 10 10.01

4 9.92 10.12 10.08 10.02 10.05

5 10.02 10.06 10.04 9.95 9.89

1 of 2

[8M]


||''|'''|''|'|''''||

b) Explain six sigma concept. How do you think that this concept would improve the

productivity?

[8M]

6 a) What are the objectives and functions of trade union? [8M]

b) Explain Rowan plan of wage rating. [8M]

7 a) Explain the rules of network construction. [8M]

b) In the following table optimistic, most likely and pessimistic times are respectively

shown against each connected activity from 1 to 10 in a project.

Activity Time Activity Time

1 - 2 4 , 8 , 12 2 - 3 1 , 4 , 7

2 – 4 8 , 12, 16 3 – 5 3 , 5 , 7

4 – 5 0 , 0 , 0 4 – 6 3 , 6 , 9

5 – 7 3 , 6 , 9 5 – 8 4 , 8 , 6

6 – 10 4 , 6 , 8 7 – 9 4 , 8 , 12

8 – 9 2 , 5 , 8 9 - 10 4 , 10 , 16

i. Construct a network.

ii. Find the critical path and its duration

iii. The schedule completion time for the project is 48 days. Calculate the

probability of finishing the project within the time.

[8M]

*****

2 of 2


||''|'''|''|'|''''||







*****

PART –A

1 a) What do you understand from the term production management? [3M]

b) Differentiate between preventive and breakdown maintenance. [4M]

c) Explain MTM. [4M]

d) Define zero defect concept. [4M]

e) State few non-financial incentives offered to the employees in a manufacturing

industry.

[4M]

f) What is critical path in the network diagram? [3M]

PART –B

2 a) Explain the scope and application of Industrial Engineering. [4M]

b) Explain Henri Fayol’s principles of management thoughts. [6M]

c) State the relationship between Management, Administration and Organization. [6M]

3 a) How Preventive maintenance is evaluated? [2M]

b) State the advantages and disadvantages of selecting the plant location in an urban

and a rural site.

[8M]

c) Explain the Quantitative techniques for optimal design of layouts. [6M]

4 a) What is time study? Describe the steps involved in time study. [8M]

b) Explain how a high productive design of a work place layout can be made with the

concept of Ergonomics motion economy

[8M]

5 a) Construct control chart �� - R for the following data on the basis of 12 samples

collected from a process, 5 data points are taken every hour. Comment on the state

of control, assuming that these are the first data. What will be future control limit?

1 2 3 4 5 6 7 8 9 10 11 12

42 42 19 36 42 51 60 18 15 69 64 61

65 45 24 54 51 74 60 20 30 109 90 78

75 68 80 69 57 75 72 27 39 113 93 94

78 72 81 77 59 78 95 42 62 118 109 109

87 90 81 84 78 132 138 60 84 153 112 136

[8M]

b) What is Quality circle? How the implementation of Quality circle enhance the

Production?

1 of 2

[8M]


||''|'''|''|'|''''||

6 a) Explain the functions of personnel management. [8M]

b) State the need and types of Job-evaluation. [8M]

7 a) Explain the concept of supply chain management and the parameters that

influence the supply chain design.

[8M]

b) The table given below shows the activity details for a construction project, with

the time estimates of each activity in days.

Activity Time estimate

Optimistic Most likely Pessimistic

1 – 2 2 5 8

2 – 3 8 11 20

3 – 4 0 0 0

2 – 4 4 7 16

2 – 5 4 9 20

4 – 6 7 10 13

5 – 6 3 7 17

3 – 7 3 5 13

6 – 7 2 3 10

7 – 8 2 4 6

i. Construct the network

ii. Find the critical path and the project duration

iii. Determine the probability of completion of project in 40 days.

[8M]

*****

2 of 2


||''|'''|''|'|''''||







*****

PART –A

1 a) How Industrial Engineering plays an important role in an industry? [3M]

b) List the major factors that govern the plant location for an automotive and auto

component manufacturing industry.

[4M]

c) What is Therbligs? [4M]

d) Define SQC. [3M]

e) State the difference between merit rating and job evaluation. [4M]

f) What is the significance of crashing in network technique? [4M]

PART –B

2 a) Define Productivity. What are the different kinds of productivity measures? [6M]

b) Explain briefly about Douglas McGregor theory X and theory Y on motivation and

management with the assumptions.

[6M]

c) Differentiate between production management and Industrial engineering. [4M]

3 a) To increase the productivity, what type of maintenance must be carried out in the

shop floor? State its importance.

[4M]

b) Discuss Product type of layout. State the advantage and disadvantage of product

type of layout over process type of layout.

[8M]

c) Explain the steps involved in designing a plant layout [4M]

4 a) Explain how micro-motion study is performed. [8M]

b) Describe briefly the different technique of rating used in connection with work

study of an operator’s performance in a labor intensive industry.

[8M]

5 a) The following data (two subgroup of size 4), is from two different machines which

are supposed to be alike. Plot the necessary chart to show whether their product

would support this assumption. If they don’t, does this prove the machines are not

essentially alike?

1 of 2

[8M]


||''|'''|''|'|''''||

Machine 1 Machine 2

Subgroup Average Range Subgroup Average Range

1 2.77 0.06 1 2.53 0.12

2 2.70 0.29 2 2.67 0.30

3 2.78 0.19 3 2.66 0.17

4 2.67 0.12 4 2.57 0.25

5 2.75 0.34 5 2.60 0.24

6 2.77 0.23 6 2.60 0.05

7 2.75 0.17 7 2.70 0.30

8 2.73 0.06 8 2.56 0.04

9 2.76 0.23 9 2.70 0.19

10 2.63 0.20 10 2.67 0.08

11 2.73 0.17 11 2.60 0.11

12 2.74 0.28 12 2.63 0.14

13 2.73 0.26 13 2.71 0.24

14 2.72 0.13 14 2.63 0.31

15 2.73 0.13 15 2.75 0.17

b) Describe the key steps involved in the process of getting registered to ISO 9000

certification.

[8M]

6 a) Why is it important to manage human resource in an organization? Discuss. [8M]

b) Explain any one type of wage incentive plan that you think will improve the

productivity of a continuous production industry.

[8M]

7 a) What is enterprise resource planning? [3M]

b) In what ways an organization is benefited by the implementation of ERP. [5M]

c) The following data gives the information about duration and cost of various

activates in a project network

Activity Normal duration

(weeks)

Normal cost

(in Rs.)

Crash duration

(weeks)

Crash cost

(in Rs.)

1 – 2 4 4000 2 12000

2 – 3 5 3000 2 7500

2 – 4 7 3600 5 6000

3 – 4 4 5000 2 10000

The project overhead costs are Rs.2000 per week. Find the optimum duration and

cost associated with it. Also, draw the least cost network.

[8M]

*****

2 of 2


code no: rt32035 r13 set - 1 iii b. tech ii semester ... · pdf fileiii b. tech ii semester...

Documents