chemical process calculations - anits

MODEL PAPER 1

ANIL NEERUKONDA INSTITUTE OF TECHNOLOGY & SCIENCES (AUTONOMOUS)

II/IV B. Tech I- Semester Regular Examinations Oct - 2016

(Regulations: R15)

Chemical Process Calculations (Chemical)

Time: 3 hours Max Marks: 60

Answer ONE Question from each Unit

All Questions Carry Equal Marks

All parts of the question must be answered in one place only

UNIT I

1) a) Write a short notes on selection of Basis in solving a material and energy balance

problem. (2M)

b) A natural gas has the following composition in mole percent:Methane 83.5, ethane

12.5,nitrogen 4.0. Calculate the average molecular weight. (2M)

c) Calcium carbide is produced according to the reaction CaO+ 3C→CaC2+CO

Estimate the consumption of lime and coke for the production of 1 ton of calcium

carbide with a composition of 78% CaC2, 15% CaO, 3% C and 4% other impurities. (8M)

(OR)

2) a) Define limiting reactant, excess reactant, conversion and yield. (4M)

b) Antimony (Sb) is obtained by heating pulverized stibinite (Sb2S3) with scrap iron

and drawing off the molten antimony from the bottom of the reaction vessel.

Sb2S3+3Fe→2Sb+3FeS

Suppose that 0.6 kg of stibinite and 0.250 kg of iron turnings are heated together to give 0.2

kg of Sb metal. Determine a) the limiting reactant b) percentage of excess reactant c) degree

of completion d) percentage conversion e) yield (Note :Molecular weight of Sb=121.8;

Molecular weight of Iron=55.85) . (8M)

UNIT II

3) a) Define Dalton’s law and Amagat’s law. (4M)

b) The gas from a sulfur burner has the following composition by volume SO3 0.8%, O2

12.2%; SO2 7.8%, N2 79.2%. a) Calculate the volume of gases (m3) at 316

0C and 1.02

kg/cm2 pressure formed per kg of sulfur burnt.b) Calculate the percentage excess oxygen

supplied for the combustion above that required for complete oxidation to S03. (8M)

(OR)

4) The flue gas out of a burner at 800oC and high pressure of 2.5 atm has the following

composition by weight.

N2 65%, C02 15%, H2O 12%, O2 7%, CO 10%

a) Calculate the composition by volume b) the density of gas mixture in gm/L at exit

temperature c) Mole fraction of the components d) Change in composition (by weight ),

when it is passed through moisture absorbing bed. (12M)

Hall Ticket No: Question Paper Code :

MODEL PAPER 2

UNIT III

5) a) Define recycle, bypass and purge stream with neat diagram. (4M)

b) Final Purification stage in the preparation of certain pharmaceutical product A from

natural sources requires centrifuging and continuous filtration as shown in figure .

Determine the flow rate of recycle stream in kg/h. (8M)

(OR)

6) a) Explain the general material balance law. (4M)

b) The spent acid from a nitrating process contains 57% H2SO4, 23% HNO3 and 20% H2O

by weight. This acid is to be strengthened to contain 27% HNO3 and 60% H2SO4 by the

addition of concentrated sulfuric acid containing 93% H2SO4 and concentrated nitric acid

containing 90% HNO3. Calculate the quantities of spent and concentrated acids that

should be mixed together to yield 5000 kg of the desired mixed acid. (8M)

UNIT IV

7) a) Define Kopps rule and Trouton’s rule. (4M)

b) Combustion of solid wastes produces a flue gas of the following analysis: CO2=9.0%,

CO=2%, O2=7% and N2=82%. Find the differences in enthalpies for this gas between the

bottom and top of the stack if the temperature of the gas between the top and bottom of the

stack if the temperature of the gas at the bottom is 600 K and that at the top is 375 K. The

heat capacities of the gas are: (8M)

CO Cp=26.586+7.582 x 10-3

T-1.12 x 10-6

T2

CO2 Cp=26.540+42.454 x 10-3

T-14.298 x 10-6

T2

O2 Cp=25.74+12.987 x 10-3

T-3.864 x 10-6

T2

N2 Cp=27.03+5.815 x 10-3

T-0.289 x 10-6

T2

Cp is in KJ/Kmole0K.

Centrifuge Filter Feed, 100 kg/h

(20% A in water)

Recycle, 0.5 kg A/ kg water

Water

65% A

35% Water Product,

93% A, 7% water

MODEL PAPER 3

(OR)

8) a) Define theoretical flame temperature and mean heat capacity. (4M)

b) Heat capacity for silicon carbide is given by the following equation

Cp=37.221+0.0122 T-11.89 x 10-6

T2

Where Cp is in KJ/Kmole0K. Calculate the mean heat capacity of silicon carbide between 100

to 700 0C. 8M)

UNIT V

9) a) Define humidity, percentage saturation and relative saturation. (4M)

b) To avoid deterioration of drugs in a container, you remove all (0.93 kg) of the water from

the moist air in the container at 15oC and 98.6 kPa by absorption in silica gel. The same air

measures 1000 m3 at 20

oC and 108.0 kPa when dry. What was the relative humidity of

moist air? (8M)

(OR)

10) a) Define dry bulb temperature, wet bulb temperature, bubble point and dew point. (4M)

b) Moist air contains 0.0109 kg water vapour per cubic metre of the mixture at 300 K and

101.3 kPa. Calculate a) partial pressure of water vapour b) relative saturation c) absolute

humidity of air d) percent saturation.

Note: The vapour pressure of water is approximated by Antonie equation as

ln PS=16.26-(3780/(T-46.854)). (8M)

******

MODEL PAPER 1


II/IV B. Tech I- Semester Regular Examinations Oct – 2016

(Regulations: R15)

Time: 3 hours

Electronics and Electrical Engineering

(Chemical)

Max Marks: 60




UNIT-1


1. a) Derive the relation between MMF, flux and reluctance . 6M

b) A flux density of 1.2 wb/m2 is required in the 2mm air gap of of an

electromagnet having an iron path 1m long. Calculate the MMF required

assuming a relative permeability of iron has 1500. Neglect leakage. (OR)

6M

2. a)

Briefly explain the Comparison between Electrical and Magnetic Circuit. 8M

b) Prove M=k√L1L2 4M

UNIT-2

3. a) Derive the EMF equation of a DC Generator 6M

b) Briefly explain the classification of a DC generators.

6M

(OR)

4. a) Derive the Torque equation of a DC Motor. 6M

b) A 6-pole lap wound shunt motor has 500 conductors. The armature and

shunt field resistance are 0.05Ω and 25Ω respectively. Find the speed of the

motor if it takes 120A from a dc supply of 100v. Flux per pole is 20mwb.

6M

UNIT-3

5. a) Derive the relation between phase and line voltages in balanced 3-ø star

connected system. 6M

b)

Define i) rms value ii) Peak factor iii) form factor 6M

(OR)

6. a) Derive EMF equation of a 1- ø transformer. 6M

b) In a 100kva transformer, the iron losses is 1.2kw and full load copper losses

is 2kw. If the load p.f is 0.8 lagging, find the efficiency at (i) full load (ii)

half -load

6M

MODEL PAPER 2

******

UNIT-4

7. a) Derive the Torque equation of a 3-ø induction motor 6M

b) Explain the Torque-slip characteristics of a 3-ø induction motor 6M

(OR)

8. a)

Derive the EMF equation of a alternator 6M

b)

Explain the principle and operation of synchronous motor 6M

UNIT-5

9. a) Briefly explain the semiconductor materials. 4M

b) With the help of V-I characteristics, explain the working of diode . 8M

(OR)

10. a) With the help of V-I characteristics, explain the working of zenordiode . 6M

b) Explain the construction of Transistor 6M

MODEL PAPER-I 1




(Regulations: R15)

MATHEMATICS- III

(MECH, ECE, EEE, CIVIL, CHEMICAL)

Time :3hours Max Marks:60




UNIT – I

1. a) Find the constants a and b so that the surface xabyzax )2(2 will be orthogonal to

the surface 44 32 zyx at the point )2,1,1(

(6)

b) Prove that FdivFgradFCurlCurl 2

(6)

(OR)

2.a) If nzyxf

222 , find fgraddiv and determine n if 0fgraddiv (6)

b) Prove that ,

2 11 12( ) ( ) ( )f r f r f r

r .

UNIT-II

(6)

(OR)

UNIT-III

3. a) If is a scalar point function , use stoke’s theorem to prove that ( ) 0Curl grad , (6)

b) Evaluate c

dyyxdxxyx )3()2( 22, where, C is the square formed by the lines

11 yandx

(6)

4. a) Verify Divergence theorem for kyzjyzixF 2taken over the cube

azzayyaxx ,0;,0;,0

(6)

b) Find the area of a circle by Green’s theorem.

(6)

5. a) Form the Partial differential equation (by eliminating the arbitrary constant a, b ) of

2222czbyax

(6)

b) Solve 2 2 2

2 23 2 cos 2

z z zx y

x x y y

(6)

MODEL PAPER-I 2

(OR)

UNIT-IV

(OR)

8. a ) Find the solution of 1-dimensional hear equation 2

2 2

1,

u u

tx c

where

2c is diffusivity

of material of the bar. (6)

UNIT-IV

(OR)

10. a) Find the Fourier Sine and Cosine transform of axexf and hence deduce the

inversion formulae

(6)

b) Using finite Fourier transform, solve 2

22

u u

t x

given that

(0, ) 0, ( ,0) ( 0)xu t u x e x and ( , )u x t is bounded where x>0, t>0.

(6)

******

6. a) Solve yxzqxzypzyx 222

. (6)

b) Solve 1 2 3 4 3 6D D D D z x y .

(6)

7. a) Solve , using variable separable method , 3 2 0, ( ,0) 4 xu uu x e

x y

. (6)

b) A tightly stretched string with fixed end points x=0 and x= l is initially in a position

given by 3

0 sinx

y yl

If it is released from rest from this position, find the

displacement ( , )y x t .

(6)

b) A homogeneous rod of conducting material of length 100cm has its ends kept at zero

temperature and the temperature initially is,

U(x,0) = , 0 50

100 , 50 100

x x

x x

..

(6)

9. a)

Find the Fourier transform of

axif

axifxaxf

0

22

, Hence Show that

4

cossin

0 3

dxx

xxx

(6)

b) Verify the convolution theorem for 2xexgxf . (6)

MODEL PAPER-II 1




(Regulations: R15)

MATHEMATICS- III

(MECH, ECE, EEE, CIVIL, CHEMICAL) Time :3hours Max Marks:60




UNIT - I

1 . a) If the directional derivative of xczzbyyax 222 at the point (1,1,1) has

maximum magnitude 15 in the direction parallel to the line zyx

2

3

2

1find

the values of a,b and c. ( 6 )

b) Prove that GFFGFGGFGF ).().().().()( . ( 6 )

(OR)

2. a) Find the angle between the surfaces 39 22222 yxzandzyx at the

point ( 2,-1, 2 ). ( 6 )

b) If 222 zyxu and kzjyixV , show that uVudiv 5)( . ( 6 )

UNIT-II

3. a) Find the total work done in moving a particle in a force field given by

kxjzixyF 1053 along the curve .21,2,1 322 ttotfromtztytx

( 6 )

b) Evaluate c

RdF. where

3 3F y i x z j z y k is the circle

5.1,422 zyx. (6)

(OR)

3. a) Verify Green’s theorem for

C

dyxdxyxy 22

where C is bounded by

2xyandxy .

( 6 )

b) Use divergence theorem to evaluate S

dsF ,. where

,333 kzjyixF and S is the

surface of the sphere .2222 azyx ( 6 )

MODEL PAPER-II 2

UNIT-III

5. a) Form the partial differential equation from 0, 222 zyxzyxF . ( 6 )

b) Solve

22 ' '6 cos (2 )D DD D x y . ( 6 )

(OR)

6. a) Solve 0)()()( 222222 yxzqxzypzyx . ( 6 )

b) Solve yxezDDDD 2'' )2()1( . ( 6 )

UNIT-IV

7. a) Solve the equation ,023

y

u

x

u.4)0,( xexu ( 6 )

b) Solve the equation 2

2

x

u

t

u

with boundary conditions

,0),1(0),0(,sin3)0,( tuandtuxnxu where .0,10 tx . ( 6 )

(OR)

8. a) Solve the completely equation ,2

22

2

2

x

yc

t

y

representing the vibrations of a

string of length ,l fixed at both ends, given that

)()0,(;0),(;0),0( xfxytlyty and .0,0)0,(

lxt

xy

( 6 )

b) Find the solutions of Laplace’s equation in polar coordinates. ( 6 )

UNIT-V

9. a) Find the Fourier cosine transform of axe

. Hence evaluate

0

22.

cosdx

ax

x ( 6 )

b) Using the Fourier integral representation, show that

.102

cossin

0

xwhendx

( 6 )

(OR)

10. a) Using Parseval’s identities, prove that

0

2222 )(2)()( baabtbta

dt ( 6 )

b) Using finite Fourier transform, solve 2

2

x

u

t

u

given 0),4(,0),0( tutu and

.0,402)0,( txwherexxu ( 6 )

******

MODEL PAPER 1


II/IV B. Tech I- Semester Regular Examinations Oct – 2016

(Regulations: R15)

Time: 3 hours

MECHANICAL ENGINEERING & STRENGTH OF MATERIALS

(Chemical)

Max Marks: 60


All Questions Carry Equal


UNIT-I

1. a) Define the terms thermodynamic system, thermodynamic process and path with suitable

examples. (4m)

b) State Kelvin Planck and Clausius statements of second law of thermodynamics. (4m)

c) An engine working on ideal otto cycle has the temperature at the beginning and end of

compression as 50°C and 373°C. Find the compression ratio and air standard efficiency.

(4m)

(OR)

2. a) State the first law of thermodynamics applied to

i) A Process ii) A Thermodynamic cycle. (4m)

b) Derive the expression for the air standard efficiency of an otto cycle. (4m)

c) 2 kg of an ideal gas is compressed adiabatically from a pressure of 100 kpa and

temperature 220 K to a final pressure of 400 kpa. Determine (i) Initial and final

volumes

(ii) Work transfer (iii) Heat transfer (iv) Change in internal energy. (4m)

UNIT-II

3. a) Explain with a neat sketch the working of Babcock and Wilcox boiler. (8m)

b) A spherical shell of 30 cm radius contains a mixture of saturated steam and water at

300°C. Calculate the mass of each if their volumes are equal. (4m)

(OR)


MODEL PAPER 2

4. a) Explain the classification of steam boilers. (4m)

b) Explain the terms (i) sensible heat (ii) latent heat of vaporization (iii) superheat. (4m)

c) Find the specific volume, specific enthalpy, internal energy and entropy of wet steam at 15

bar pressure and dryness fraction 0.8. (4m)

UNIT-III

5. a) What are the reasons for providing cooling systems in I.C engines. Classify the cooling

systems. (6m)

b) A 4-Stroke 6 cylinder engine has a bore of 80 mm and stroke of 100 mm. Its mean speed

is 12.5 m/s, fuel consumption is 20 kg/hr and develops a torque of 150 N-m. Determine

i) Brake power ii) B.m.e.p iii) Brake thermal efficiency if calorific value of the fuel used

is 42.5 MJ/kg. (6m)

(OR)

6. a) Describe the working of a 4-Stroke diesel engine using theoretical and actual p-v

diagrams. (6m)

b) A 4-Stroke petrol engine having 6 cylinders is to operate with compression ratio 6 and

delivers 300 KW brake power when running at 2400 rpm. Determine i) Bore and stroke

ii) fuel consumption in kg/hr. Assume stroke equal to 1.25 times the bore. Mechanical

efficiency 80%, Indicated mean effective pressure = 10 bar, Relative efficiency = 50%,

Calorific value of fuel 44 MJ/kg. (6m)

UNIT-IV

7. a) Draw and explain the stress-strain curve for mild steel. (4m)

b) An element has a tensile stress of 600 N/mm2 and compressive stress of 400 N/mm

2 acting

on two mutually perpendicular planes and a shear stress of 100 N/mm2 on these planes.

Find the principal stresses and maximum shear stress. (8m)

(OR)

8. a) Define the following terms (i) stress (ii) strain (iii) elasticity (iv) elastic limit (v) limit of

proportionality (vi) Hooke’s law. (6m)

MODEL PAPER 3

b) A bar of 400 mm length is 20 mm in diameter for the first 200 mm and 10 mm in diameter

for the remaining 200 mm length. If it is loaded as shown in Fig, find the total elongation.

(6m)

UNIT-V

9. a) State the assumptions made in Lames theory for analysis of thick shells. (4m)

b) Calculate the minimum wall thickness of a thin cylinder 1m in diameter if it is to

withstand an initial pressure of 2 N/mm2, the longitudinal stress is not to exceed 30 N/mm

2

and the hoop stress is not to exceed 40 N/mm2. (8m)

(OR)

10. a) Differentiate between thin and thick cylinders. (4m)

b) Calculate the increase in volume of a boiler shell 3 m long and 1 m in diameter when

subjected to internal pressure of 2 N/mm2 wall thickness is such that the maximum tensile

stresss is not to exceed 30 N/mm2. E=0.21x10

6 N/mm

2 (8m)

******

10 mm P1=2000 N

P2=1000 N

P1

P2

L1=200 mm

L2=200 mm

20 mm

MODEL PAPER 1



(Regulations: R15) Organic Chemistry

(Chemical)

Time: 3 hours Max Marks: 60




UNIT-I

1. a). Write the IUPAC names of the following compounds 4m

(i). CH3-CH=CH-CH3 (ii) CH3-CH (OH)-CH2-CH2-CH3 (iii) HCHO (iv) CH3CH2COOH

b). Describe elimination & substation organic reactions with examples. 4m

c). Give the reason for the following- 4m

(i). Stability of tertiary carbocations than secondary and primary.

(ii). Basic nature of amines.

(OR)

2. a). Define Isomerism. Explain Functional & Positional isomerism in organic compounds with

examples. 4m

b). What is meant by an eletrophile and a nucleophile? Give examples. 4m

c). Give the reason for the following- 4m

(i). Stability of primary carbanions than secondary and tertiary.

(ii).Acidic nature of carboxylic acids.

UNIT-II

3. a).(i) Draw the conformational isomers of cyclo hexane & explain the stability order. 3m

(ii) Define enantiomers. give examples. 3m

b). Explain the sequence rules to predict E-Z isomerism for organic compounds with

examples. 6m

(OR)

4. a). (i) Draw the Newmanns projection for ethane & n-butane and explain the stability

order. 3m

(ii) Define Optical activity. give examples. 3m

b). Explain Cahn-Ingold-Prelog rules to predict R-S configuration for organic compounds.

6m

UNIT-III

5. a). How will you differentiate 1o, 2

o and 3

o alcohols? (any 2). 6m

b). Write the following chemical reactions with mechanism

i. Reimer-Teimann reaction. 3m

ii. Knoevenagal reaction. 3m

(OR)

6. a). Describe the chemical reactions to differentiate aldehydes and ketones. (any2). 6m

b). Write the following chemical reactions with mechanism

i. Aldol condensation. 3m

ii. Fries rearrangement. 3m


MODEL PAPER 2

UNIT-IV

7. a).(i) Give the Industrial preparation of acetic acid. 3m

(ii) Explain Hoffmann-bromamide reaction with mechanism. 4m

b). Describe any 3 sythetic applications of diazonium salts. 5m

(OR)

8. a).(i) Give the industrial preparation of aniline. 3m

(ii) Explain Claisen condensation with mechanism. 4m

b). Differentiate between 1o, 2

o and 3

o amines. 5m

UNIT-V

9. a). Describe the chemical nature and synthetic applications of LiAlH4 & NaBH4. 6m

b).(i). Write a note on the mode of action of sulphanilamide. 3m

(ii). Explain any 2 preparation methods of Pyridine. 3m

(OR)

10. a). Give the chemical nature and write the synthetic applications of OsO4 and Chromic

acid. 6m

b). (i). Describe the mode of action of Sulphapyridene. 3m

(ii). Explain any 2 preparation methods of Thiophene. 3m

*****

chemical process calculations - anits

Documents