engineering interview questions

8/18/2019 Engineering Interview Questions

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7e8 2 9 :

&ns9 c

:. he permissible stress for carbon steel under static loading is generally taen as7a8 :;;;;;;?;; g=cm:

7d8 @?;;


3/27

through the bar as follows

7a8 vpE

7b8 v%vC7c8 DpE=:

7d8 Iv!pE

7e8 none of the above, where E modulus of elasticity and p mass density.&ns9 a

4. ensile strength of a mild steel specimen can be roughly predicted from following hardness

test

7a8 (rinell7b8 +ocwell

7c8 %icer

7d8 ShoreAs sceleroscope7e8 none of the above.

&ns9 a

F. +esilience of a material is important, when it is subjected to

7a8 combined loading7b8 fatigue

7c8 thermal stresses

7d8 wear and tear 7e8 shoc loading.

&ns9 e

2;. In the case of an elastic bar fiGed at upper end and loaded by a falling weight at lower end,

the shoc load produced can be decreased by

7a8 decreasing the cross


4/27

7e8 none of the above.

&ns9 a

23. (rittle coating technique is used for 7a8 determining brittleness

7b8 protecting metal against corrosion7c8 protecting metal against wear and tear

7d8 eGperimental stress analysis7e8 non. Stress concentration is caused due to7a8 variation in properties of material from point to point in a member

7b8 pitting atApoints or areas at which loads on a member are applied

7c8 abrupt change of section

7d8 all of the above

7e8 none of the above.&ns9 d

2?. he endurance limit of a material with finished surface in comparison to rough surface is

7a8 more7b8 less

7c8 same

7d8 more or less depending on quantum of load7e8 unpredictable.

&ns9 a

2B. -lastic flow in ductile materials7a8 increases the seriousness of static load times more

7e8 unpredictable.&ns9 c


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24. he fatigue life of a part can be improved by

7a8 electroplating

7b8 polishing7c8 coating

7d8 shot peening

7e8 heat treating.&ns9 d

2F. Stress concentration in static loading is more serious in

7a8 ductile materials

7b8 brittle materials7c8 equally serious in both cases

7d8 depends on other factors

7e8 unpredictable.&ns9 b

:;. Stress concentration in cyclic loading is more serious in7a8 ductile materials

7b8 brittle materials7c8 equally serious in both cases


7e8 unpredictable.&ns9 a

:2. Endurance limit or fatigue limit is the maGimum stress that a member can withstand for an

infinite number of load applications without failure when subjected to

7a8 dynamic loading

7b8 static loading7c8 combined static and dynamic loading

7d8 completely reversed loading7e8 all of the above.

&ns9 d

::. -ic up wrong statement. Catigue strength can be increased by

7a8 cold woring7b8 shot peening

7c8 grinding and lapping surface

7d8 hot woring

7e8 using gradual changes of section.&ns9 d

:3. Dhich of the following is not correct procedure to increase the fatigue limit

7a8 cold woring7b8 shot peening

7c8 surface decarburisation

7d8 under


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7e8 all of the above.

&ns9 c

:>. $oaGing is the procedure of increasing7a8 metal strength by cycling

7b8 metal hardness by surface treatment7c8 metal resistance to corrosion by coating

7d8 fatigue limit by overstressing the metal by successively increasing loadings7e8 none of the above.

&ns9 d

:?. Dhich is correct statement JStress concentration in static loading is

7a8 very serious in brittle materials and less serious in ductile materials

7b8 very serious in ductile materials and less serious in brittle materials

7c8 equally serious in both types of materials

7d8 seriousness would depend on other factors7e8 none of the above.

&ns9 a

:B. he notch angle of the Izod impact test specimen is7a8 2;K

7b8 :;K

7c8 3;K7d8 >?K

7e8 B;K.

&ns9 d

:@. In %icerAs hardness testing, the pyramid indentor apeG is7a8 >;K

7b8 2::K

7c8 23BK7d8 2?:K

7e8 2B2K.

&ns9 c

:4. Dhich is correct statement JStress concentration in cyclic loading is

7a8 very serious in brittle materials and less serious in ductile materials

7b8 very serious in ductile materials and less serious in brittle materials7c8 equally serious in both types of materials

7d8 seriousness would depend on other factors

7e8 none of the above.&ns9 c


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:F. In testing a material for endurance strength, it is subjected to

7a8 static load

7b8 dynamic load7c8 impact load

7d8 static as well as dynamic load

7e8 completely reversed load.&ns9 e

3;. If a material fails below its yield point, failure would be due to

7a8 straining

7b8 fatigue7c8 creep

7d8 sudden loading

7e8 impact loading.&ns9 b

32. he fatigue limit of a material7a8 is greatly decreased by poor surface conditions

7b8 remains same irrespective of surface conditions7c8 depends mainly on core composition

7d8 is dependent upon yield strength of material

7e8 none of the above.&ns9 a

3:. $old woring

7a8 increases the fatigue strength

7b8 decreases the fatigue strength

7c8 has no influence on fatigue strength7d8 alone has no influence on fatigue strength


33. 0ield point in fatigue loading as compared to static loading is

7a8 same

7b8 higher 7c8 lower



&ns9 c

3>. +esidual stress in materials

7a8 acts when eGternal load is applied

7b8 becomes zero when eGternal load is removed7c8 is independent of eGternal loads

7d8 is always harmful


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7e8 is always beneficial.

&ns9 c

3?. he building up of worn and uridersized parts, subjected to repeated loads by electroplatingis

7a8 best method7b8 eGtremely hazardous

7c8 has no effect as regards fatigue strength7d8 cheapest method


&ns9 a

3B. In nitrated parts, the origins of the fatigue cracs will occur at

7a8 surface

7b8 just below the surface

7c8 within the core

7d8 could occur anywhere7e8 none of the above.

&ns9 e

3@. Dhich process will increase the fatigue duration of parts J7a8 finishing and polishing

7b8 shot


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>;. In most machine members, the damping capacity of the material should be

7a8 low

7b8 zero7c8 high

7d8 could be anything


>2. he ratio of endurance limit in shear to the endurance limit in fleGure is

7a8 ;.33

7b8 ;.>7c8 ;.?

7d8 ;.??

7e8 ;.B&ns9 d

>:. Cor steel, the ultimate strength in shear as compared to ultimate strength in tension is7a8 same

7b8 2=:7c8 2=3

7d8 2=>

7e8 :=3&ns9 e

>3. he endurance limit in shear of carbon steel can be obtained by multiplying the endurance

limit in fleGure by a factor of

7a8 ;.:?

7b8 ;.>?7r8 ;.??

7d8 ;.B?7e8;.@?.

&ns9 e

>>. &t low temperatures 7say @?K$8 the notched?. & bolt

7a8 has a head on one end and a nut fitted to the other 7b8 has head at one end and other end fits into a tapped hole in the other part to be joined

7c8 has both the ends threaded

7d8 is provided with pointed threads


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7b8 brittle materials

7c8 elastic materials

7d8 all of the above7e8 none of the above.

&ns9 a

?:. & tap bolt

7a8 has a head on one end and a nut fitted to the other 7b8 has head at one end and other end fits into a tapped hole in the other part o be joined

7c8 has both the ends threaded

7d8 has pointed threads7e8 requires locing devices.

&ns9 b

?3. Cor applications involving high stresses in one direction only the following type of thread

would be best suited

7a8 IS" metric thread7b8 acme thread

7c8 square thread7d8 buttress thread

7e8 (ritish &ssociation thread.

&ns9 d

?>. he included angle in unified of &merican )ational threads is7a8 B;K

7b8 ??K

7c8 >@K

7d8 :FK7e8 none of the above.

&ns9 a

??. he function of a washer is to7a8 provide cushioning effect

7b8 provide bearing area

7c8 absorb shocs and vibrations7d8 provide smooth surface in place of rough surface

7e8 act as a locing device.

&ns9 b

?B. $ap screws are7a8 similar toAsmall size tap bolts eGcept that a greater variety of shapes of heads are available

7b8 slotted for a screw driver and generally used with a nut

7c8 used to prevent relative motion be


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?@. &n alien bolt is

7a8 self locing bolt

7b8 same as stud7c8 provided with heGagonal depression in head

7d8 used in high speed components

7e8 provided with countersun head.&ns9 c

?4. he deflection of a cantilever beam under load D is 4. If its width is halved, then the

deflection under load D will be

7a8 :47b8 4=:

7c8 >4

7d8 4=>7e8 none of the above.

&ns9 c

?F. (all bearing type screws are found in following application

7a8 screw jac 7b8 aeroplane engines

7c8 crane

7d8 steering mechanism7e8 bench vice.

&ns9 d

B;. Set screws are

7a8 similar to small size tap bolts eGcept that a greater variety of shapes of heads are available

7b8 slotted for a screw driver and generally used with a nut7c8 used to prevent relative motion be


13/27


&ns9 c

B3. #achine screws are7a8 similar to small size tap bolts eGcept that a greater variety of shapes of heads are available

7b8 slotted for a screw driver and generally used with a nut7c8 used to prevent relative motion be. +ivets are generally specified by7a8 thicness of plates to be riveted

7b8 length of rivet

7c8 diameter of head

7d8 nominal diameter

7e8 all of the above.&ns9 d

B?. he edges of a boiler plate are bevelled to an angle of

7a8 3;K7b8 >?K

7c8 B;K

7d8 4;K7e8 4?K.

&ns9 d

BB. Dhich of the following is a permanent fastening J7a8 bolts7b8 eys

7c8 cotters

7d8 rivets7e8 screws.

&ns9 d

B@. In order to avoid tearing of the plate at edge, the distance from the center line of the rivet

hole to the nearest edge of the plate in terms of dia. of rivet d should be equal to7a8 d

7b8 2.:? d

7c8 2.? d7d8 2.@? d

7e8 : d.

&ns9 c

B4. If the tearing efficiency of a riveted joint is @?O, then the ratio of diameter of rivet to the pitch is equal to


14/27

7a8 ;.:

7b8 ;.:?

7c8 ;.?;7d8 ;.B

7e8 ;.@?.

&ns9 b

BF. ransverse fillet welded joints are designed for 7a8 tensile strength

7b8 compressive strength

7c8 shear strength7d8 bending strength

7e8 torsional strength.

&ns9 a

@;. Pam nut is a locing device in which

7a8 one smaller nut is tightened over main nut and main nut tightened against smaller one byloosening, creating friction jamming

7b8 a slot is cut partly in middle of nut and then slot reduced by tightening a screw7c8 a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed

on the bolt causing a tight grip

7d8 through slots are made at top and a cotter


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7b8 increase its length

7c8 drill an aGial hole through head up to threaded portion so that shan area is equal to root area

of thread7d8 tighten die bolt properly


&ns9 c

@>. & ey capable of tilting in a recess milled out in a shaft is nown as7a8 wood


16/27

@F. Eye bolts are used for

7a8 foundation purposes

7b8 locing devices 7c8 absorbing shoc and vibrations

7d8 transmission of power

7e8 lifting and transportation of machines and cubicles.&ns9 e

4;. Elastic nut is a locing device in which

7a8 one small nut is tightened over main nut and main nut tightened against smaller one by

loosening, creating friction jamming7b8 a slot is cut partly in middle of nut and then slot reduced by tightening a screw

7c8 hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on

the bolt causing a tight grip7d8 through slots are made at top and a cotter d

7c8 234 d

7d8 2?2 d

7e8 2B4 d.&ns9 e

4:. If threads on a bolt are left hand, threads on nut will be

7a8 right hand with same pitch7b8 left hand with same pitch

7c8 could be left or right hand

7d8 right hand with fine pitch

7e8 left hand with fine pitch.&ns9 b

43. aper usually provided on cotter is

7a8 2 in ?

7b8 2 in 2;7c8 2 in :>

7d8 2 in >;

7e8 2 in ?;.&ns9 c

4>. &pplications in which stresses are encountered in one direction only uses following type of

threads


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7a8 metric

7b8 buttress

7c8 acme7d8 square

7e8 (SD.

&ns9 b

4?. he draw of cotter need not eGceed7a8 3 mm

7b8 ? mm

7c8 2; mm7d8 :; mm

7e8 :? mm.

&ns9 a

4B. & bench vice has following type of threads

7a8 metric7b8 square

7c8 buttress7d8 acme

7e8 (SD.

&ns9 d

4@. he valve rod in a steam engine is connected to an eccentric rod by7a8 cotter joint

7b8 bolted joint

7c8 uncle joint

7d8 universal coupling7e8 gib and cotter joint.

&ns9 c

44. Split nut is a locing device in which7a8 one smaller nut is tightened over main nut and main nut tightened against smaller one by

loosening, creating friction jamming

7b8 a slot is cut partly in middle of nut and then slot reduced by tightening screw7c8 a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed

on the bolt causing a tight grip

7d8 through slots are made at top and a cotter


18/27

7d8 may be provided anywhere


&ns9 b

F;. he function of cutting oil when threading a pipe is to

7a8 provide cooling action7b8 lubricate the dies

7c8 help remove chips7d8 all of the above


&ns9 d

F2. Silver. & tube has the following advantage over pipe7a8 lighter and easier to handle

7b8 greater shoc absorption

7c8 smoother inside walls7d8 all of the above


&ns9 d

F?. he strap end of a connecting rod of steam engine is joined by7a8 gib of cotter joint


19/27

7b8 sleeve and cotter joint

7c8 spigot socet cotter joint

7d8 nucle joint7e8 universal coupling.

&ns9 a

FB. & bacing ring is used inside the pipe joint when maing a

7a8 butt weld7b8 fillet weld

7c8 sleeve weld

7d8 socet weld7e8 tube weld.

&ns9 a

F@. he shear plane in case of bolts should

7a8 be across threaded portion of shan

7b8 be parallel to aGis of bolt7c8 be normal to threaded portion of shan

7d8 never be across the threaded portion7e8 none of the above.

&ns9 d

F@. $astle nut is a locing device in which

7a8 one smaller nut is tightened over main nut and main nut tightened against smaller one byloosening, creating friction jamming

7b8 a slot is cut partly is middle of nut and then slot reduced by tightening a screw

7c8 a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed

on the bolt causing a tight grip7d8 through slots are made at top and a cotter pin is passed through these and a hole in the bolt,

and cotter pin spitted and bent in reverse direction at other end7e8 none of the above.

&ns9 d

F4. Dhen a nut is tightened by plaping a washer below it, the bolt will be subjected to following

type of loads7a8 compression

7b8 tension

7c8 shear

7d8 combined loads7e8 all of the above.

&ns9 b

FF. /ear boG is used7a8 to produce torque

7b8 for speed reduction

7c8 to obtain variable speeds


20/27

7d8 to increase efficiency of system

7e8 to damp out vibrations.

&ns9 c

2;;. he edges of the plates for cylindrical vessels are usually bevelled to an angle of 4;K for

7a8 reducing stress concentration7b8 ease of manufacture

7c8 safety7d8 fullering and cauling


&ns9 d

2;2. he piston rod of a steam engine is usually connected to the crosshead by means of

7a8 bolted joint

7b8 uncle joint

7c8 cotter joint

7d8 universal joint7e8 universal coupling.

&ns9 c

2;:. Dhich of the following pipe joints would be suitable for pipes carrying steam7a8 flanged

7b8 threaded

7c8 bell and spigot7d8 eGpansion

7e8 compression.

&ns9 d

2;3. Spring indeG is7a8 ratio of coil diameter to wire diameter

7b8 load required to produce unit deflection

7c8 its capability of storing energy7d8 indication of quality of spring

7e8 nothing.

&ns9 a

2;>. he shearing stresses in the inner face as compared to outer face of the wire in a heavy closecoiled spring is

7a8 larger

7b8 smaller 7c8 equal

7d8 larger=smaller depending on diameter of spring coil

7e8 unpredictable.&ns9 a


21/27

2;?. Corm coefficient of spring is

7a8 ratio of coil diameter to wire diameter

7b8 load required to produce unit deflection7c8 its capability of storing energy

7d8 concerned Dith strength of wire of spring

7e8 nothing&ns9 c

2;B. Spring stiffness is

7a8 ratio of coil diameter to wire diameter

7b8 load required to produce unit deflection7c8 its capability of storing energy

7d8 its ability to absorb shocs

7e8 none of the above.&ns9 b

2;@. Dhen two springs are in series 7having stiffness R8, the equivalent stiffness will be7a8 R

7b8 R=:7c8 :R

7d8 RI&

7e8 *R.&ns9 b

2;4. Dhen a close coiled helical spring is compressed, its wire is subjected to

7a8 tension

7b8 shear

7c8 compression7d8 all of the above


2;F. If a spring is cut down into two springs, the stiffness of cut springs will be

7a8 half

7b8 same7c8 double

7d8 unpredictable


&ns9 c

22;. (elt slip may occur due to

7a8 heavy load

7b8 loose belt7c8 driving pulley too small

7d8 all of the above


22/27


&ns9 d

222. &ircraft body is usually fabricated by7a8 welding

7b8 precasting7c8 rivetting

7d8 casting7e8 unconventional methods.

&ns9 c

22:. If two springs are in parallel then their overall stiffness will be7a8 half

7b8 same

7c8 double

7d8 unpredictable


223. In hydrodynamic bearings

7a8 the oil film pressure is generated only by the rotation of the journal7b8 the oil film is maintained by supplying oil under pressure

7c8 do not require eGternal supply of lubricant

7d8 grease is used for lubrication7e8 none of the above.

&ns9 a

22>. &ntifriction bearings are7a8 sleeve bearings7b8 hydrodynamic bearings

7c8 thin lubricated bearings

7d8 ball and roller bearings7e8 none of the above.

&ns9 e

22?. If p bearing pressure on projected bearing area, z absolute viscosity of lubricant, and )

speed of journal, then the bearing characteristic number is given by7a8 )=p

7b8 p=)

7c8 =p)7d8 )=p

7e8 p=).

&ns9 a

22B. he usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is7a8 ;.;2 micron


23/27

7b8 ;.2 micron

7c8 2 micron

7d8 2; microns7e8 :? microns.

&ns9 c

22@. In hydrostatic bearings

7a8 the "il film pressure is generated only by the rotation of the journal7b8 the oil film is maintained by supplying oil under pressure


7d8 grease is used for lubrication7e8 none of the above.

&ns9 b

224. "il in journal bearing should be applied at the point where load is

7a8 nil or lightest

7b8 maGimum7c8 average

7d8 any one of the above7e8 unpredictable.

&ns9 a

22F. he rated life of a bearing varies

7a8 directly as load7b8 inversely as square of load

7c8 inversely as cube of load

7d8 inversely as fourth power of load


2:;. In oilness bearings

7a8 the oil film pressure is generated only by the rotation of the journal7b8 the oil film is maintained by supplying oil under pressure


7d8 grease required to be applied after some intervals7e8 none of the above.

&ns9 c

2:2. In %


24/27

2::. hree different weights fall from a certain height under vacuum. hey will tae

7a8 same time to reach earth

7b8 times proportional to weight to reach earth7c8 times inversely proportional to weight to reach earth

7d8 unpredictable


2:3. In cross or regular lay ropes

7a8 direction of twist of wires in strands is opposite to the direction of twist of strands

7b8 direction of twist of wires and strands are same7c8 wires in two adjacent strands are twisted in opposite direction

7d8 wires are not twisted


2:>. In standard taper roller bearings, the angle of taper of outer raceway is7a8 ?K

7b8 4K7c8 2?K

7d8 :?K

7e8 >;K.&ns9 d

2:?. In composite or reverse laid ropes

7a8 direction of twist of wires in strands is opposite to the direction of twist of strands

7b8 direction of twist of wires and strands are same

7c8 wires in two adjacent strands are twisted in opposite direction7d8 wires are not twisted


2:B. Dhether any core is required in wire ropes

7a8 yes

7b8 no7c8 sometimes

7d8 rarely

7e8 very often.

&ns9 a

2:@. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

7a8 diameter of bolt

7b8 ;.@? G diameter of bolt7c8 2.:? G diameter of bolt

7d8 2.? G diameter of bolt


25/27

7e8 ;.? G diameter of bolt.

&ns9 a

2:4. (asic shaft is one7a8 whose upper deviation is zero

7b8 whose lower deviation is zero7c8 whose lower as well as upper deviations are zero

7d8 does not eGist7e8 none of the above.

&ns9 a

2:F. (asic hole is one7a8 whose upper deviation is zero

7b8 whose lower deviation is zero

7c8 whose lower as well as upper deviations are zero

7d8 does not eGist

7e8 none of the above.&ns9 b

23;. I.S. specifies following total number of grades of tolerances

7a8 247b8 2B

7c8 :;

7d8 ::7e8 2>.

&ns9 a

232. Cor standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut 7h8 is approGimately7a8 ;.> times

7b8 ;.B times

7c8 ;.@ times7d8 ;.4 times

7e8 ;.F times the normal diameter of bolt.

&ns9 a

23:. &llen bolts are7a8 self locing bolts

7b8 designed for shoc load

7c8 used in aircraft application7d8 provided with heGagonal depression in head

7e8 uniform strength bolts.

&ns9 d

233. he resultant aGial load on a bolt depends on7a8 initial tension


26/27

7b8 eGternal load applied

7c8 relative elastic yielding 7springness8 of the bolt and the connected member

7d8 7a8 and 7b8 above7e8 7a8, 7b8 and 7c8 above.

&ns9 e

23>. he connecting rod bolts are tightened up so that tightening stress

7a8 is just sufficient to hold parts together 7b8 approaches yield point

7c8 is ?;O of yield point

7d8 is about yield point divided by safety factor 7e8 none of the above.

&ns9 b

23?. he connecting rod bolts are tightened up with initial tension greater than the eGternal load

so that

7a8 joint may not open up7b8 bolts are weaest elements

7c8 the resultant load on the bolt would not be affected by the eGternal cyclic load7d8 bolts will not loosen during service


&ns9 c

23B. If an application calls for stresses on screw threads in one direction only, then the followingtype of thread would be best suited

7a8 square

7b8 acme

7c8 buttress7d8 (SD

7e8 metric.&ns9 c

23@. Dhen a bolt is subjected to shoc loading, the resilience of the bolt should be considered in

order to prevent breaage at

7a8 shan 7b8 head

7c8 in the middle

7d8 at the thread

7e8 anywhere in the bolt.&ns9 d

234. he shoc absorbing capacity of a bolt can be increased by

7a8 tightening it properly7b8 increasing shan diameter

7c8 grinding the shan

7d8 using washer


27/27

7e8 maing shan diameter equal to core diameter of thread.

&ns9 e

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