mechanical engineering MCQs – Page 202

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 Review each marked answer and report any item that may be outdated or unclear.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

4021. Fatigue strength can be increased by__________________?
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A. cold working

B. hot working

C. shot peening

D. using gradual changes of section

E. grinding and lapping surface

4022. If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be_________________?
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A. 20Vdto30Vd

B. 30V5?to40Vd

C. lOVZ

D. 10VZtol5Vd

E. 15Vdto20VZ

4023. Fibrous fracture occurs in_____________?
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A. hard material

B. brittle material

C. ductile material

D. elastic material

E. all of the above

4024. Which of the following pipe joints would be suitable for pipes carrying steam_____________?
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A. threaded

B. flanged

C. compression

D. expansion

E. bell and spigot

4025. Other method of reducing shock load in the above case can be_________________?
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A. unaffected by length

B. to increase length

C. none of the above

D. to decrease length

E. other factors would decide same

4026. Plastic flow in ductile materials_____________________?
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A. depends on other considerations

B. lessens the seriousness of static loading stress concentration

C. none of the above

D. increases the seriousness of static load-ing stress concentration

E. has no effect on it

4027. Turn buckle has____________________?
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A. right hand threads on bout ends

B. left hand threads on both ends

C. left hand threads on one end and right hand threads on other end

D. no threads

E. threads in middle portion

4028. Belt slip may occur due to________________?
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A. loose belt

B. driving pulley too small

C. all of the above

D. none of the above

E. heavy load

4029. Stress concentration in cyclic loading is____________________?
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A. ch is correct statement ?

B. very serious in brittle materials and less serious in ductile materials

C. very serious in ductile materials and less serious in brittle materials

D. equally serious in both types of materials

E. seriousness would depend on other factors

F. none of the above

4030. A bolt___________________?
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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. is provided with pointed threads

E. requires no nut

4031. Castle nut is a locking device in which__________________?
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A. 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

B. a slot is cut partly is middle of nut and then slot reduced by tightening a screw

C. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

D. 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 end

E. none of the above.

4032. Gear box is used___________________?
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A. to obtain variable speeds

B. for speed reduction

C. to damp out vibrations

D. to increase efficiency of system

E. to produce torque

4033. A key made from a cylindrical disc having segmental cross-section, is known as______________?
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A. feather key

B. hollow saddle key

C. flat saddle key

D. gib head key