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machine design MCQs

Practise focused machine design questions with marked answers for exam preparation and subject revision.

machine design Mcqs

1. The crest diameter of a screw thread is same as _____________________?
0

A. none of the above

B. major diameter

C. pitch diameter

D. core diameter

E. minor diameter

2. Antifriction bearings are__________________?
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A. none of the above

B. ball and roller bearings

C. sleeve bearings

D. hydrodynamic bearings

E. thin lubricated bearings

3. The permissible stress for carbon steel under static loading is generally taken as__________________?
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A. 10,000-15,000 kg/cm2

B. 2000-3000 kg/pm2

C. 3000-4000 kg/cm2

D. 4000-4500 kg/cm2

E. 7500-10,000 kg/cm2

4. If threads on a bolt are left hand, threads on nut will be_____________________?
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A. right hand with fine pitch

B. left hand with fine pitch

C. right hand with same pitch

D. left hand with same pitch

E. could be left or right hand

5. Transverse fillet welded joints are designed for________________?
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A. torsional strength

B. compressive strength

C. tensile strength

D. bending strength

E. shear strength

6. Elastic nut is a locking device in which__________________?
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A. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

B. none of the above

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

D. hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

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

7. Three different weights fall from a certain height under vacuum. They will take______________?
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A. times inversely proportional to weight to reach earth

B. same time to reach earth

C. none of the above

D. unpredictable

E. times proportional to weight to reach earth

8. In V-belt drive, belt touches______________?
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A. at bottom

B. at sides only

C. both at bottom and sides

D. could touch anywhere

E. none of the above

9. The strap end of a connecting rod of steam engine is joined by_________________?
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A. spigot socket cotter joint

B. gib of cotter joint

C. sleeve and cotter joint

D. knuckle joint

E. universal coupling

10. Silver-based solder is used for__________________?
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A. none of the above

B. flaring

C. fusion welding

D. brazing

E. soft soldering

11. The fatigue life of a part can be improved by_____________________?
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A. shot peening

B. polishing

C. heat treating

D. coating

E. electroplating

12. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be________________?
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A. 4-Aug

B. 28

C. 48

D. 2-Aug

E. none of the above

13. A self locking screw has________________>
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A. coefficient of friction > tangent of load angle

B. two nuts for locking

C. coarse threads

D. hole for inserting split pin

E. fine threads

14. For steel, the ultimate strength in shear as compared to ultimate strength in tension is ___________________?
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A. 2-Jan

B. 3-Jan

C. same

D. 4-Jan

E. 2/3

15. Basic hole is one_________________?
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A. whose lower as well as upper deviations are zero

B. whose upper deviation is zero

C. none of the above

D. whose lower deviation is zero

E. does not exist

16. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to________________?
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A. static loading

B. all of the above

C. completely reversed loading

D. dynamic loading

E. combined static and dynamic loading

17. The following type of nut is used with alien bolt____________________?
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A. slotted nut

B. castle nut

C. alien nut

D. any one of the above

E. hexagonal nut

18. The fatigue limit of a material____________________?
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A. none of the above

B. is greatly decreased by poor surface conditions

C. depends mainly on core composition

D. remains same irrespective of surface conditions

E. is dependent upon yield strength of material

19. I.S. specifies following total number of grades of tolerances__________________?
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A. 16

B. 18

C. 22

D. 14

E. 20

20. Taper on the cotter and slot is provided_________________?
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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

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