mechanical engineering MCQs – Page 200

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

3981. I.S. specifies following total number of grades of tolerances__________________?
0

A. 16

B. 18

C. 22

D. 14

E. 20

3982. Taper on the cotter and slot is provided_________________?
0

A. on both the sides

B. on one side only

C. on none of the sides

D. may be provided anywhere

E. none of the above

3983. A backing ring is used inside the pipe joint when making a___________________?
0

A. sleeve weld

B. socket weld

C. fillet weld

D. tube weld

E. butt weld

3984. In hydrostatic bearings ____________________?
0

A. the oil film is maintained by supplying oil under pressure

B. do not require external supply of lubricant

C. the Oil film pressure is generated only by the rotation of the journal

D. none of the above

E. grease is used for lubrication

3985. Coaxing is the procedure of increasing__________________?
0

A. metal hardness by surface treatment

B. none of the above

C. fatigue limit by overstressing the metal by successively increasing loadings

D. metal resistance to corrosion by coating

E. metal strength by cycling

3986. Shear stress theory is applicable for____________________?
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A. brittle materials

B. none of the above

C. elastic materials

D. all of the above

E. ductile fnaterials

3987. In nitrated parts, the origins of the fatigue cracks will occur at__________________?
0

A. surface

B. within the core

C. could occur anywhere

D. just below the surface

E. none of the above

3988. An alien bolt is___________________?
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A. self locking bolt

B. provided with hexagonal depression in head

C. provided with countersunk head

D. used in high speed components

E. same as stud

3989. When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads___________________?
0

A. combined loads

B. compression

C. all of the above

D. tension

E. shear

3990. The ratio of endurance limit in shear to the endurance limit in flexure is__________________________?
0

A. 0.5

B. 0.6

C. 0.55

D. 0.4

E. 0.33

3991. Which of the following is not correct procedure to increase the fatigue limit_______________?
0

A. cold working

B. under-stressing

C. shot peening

D. surface decarburisation

E. all of the above

3992. A stud________________________?
0

A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part to be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking nuts

3993. A tap bolt_____________________?
0

A. has a head on one end and a nut fitted to the other

B. has head at one end and other end fits into a tapped hole in the other part o be joined

C. has both the ends threaded

D. has pointed threads

E. requires locking devices

3994. The resultant axial load on a bolt depends on_______________?
0

A. A, B. and C. above

B. relative elastic yielding (springness) of the bolt and the connected member

C. A. and B. above

D. initial tension

E. external load applied

3995. Stress concentration is caused due to_____________________?
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A. abrupt change of section

B. none of the above

C. pitting atpoints or areas at which loads on a member are applied

D. all of the above

E. variation in properties of material from point to point in a member

3996. The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of____________?
0

A. 0.55

B. 0.45

C. 0.75

D. 0.65

E. 0.25

3997. If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?
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A. ZN/p

B. Z/pN

C. p/ZN

D. Zp/N

E. N/Zp

3998. Taper usually provided on cotter is_________________?
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A. 1 in 40

B. 1 in 5

C. 1 in 10

D. 1 in 24

E. 1 in 50

3999. If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited ________________?
0

A. buttress

B. square

C. metric

D. acme

E. BSW

4000. Whether any core is required in wire ropes________________?
0

A. no

B. very often

C. sometimes

D. yes

E. rarely

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