21. The pipe joint mostly used for pipes carrying water at low pressures is-

A. socket joint

B. nipple joint

C. spigot and socket joint

D. union joint

Click for Answer/Explanation

Correct Answer is A

22. The helix angle for single helical gears ranges from-

A. 10° to 15°

B. 15° to 20°

C. 20° to 35°

D. 35° to 45°

Click for Answer/Explanation

Correct Answer is C

23. Surface endurance limit of gear material is dependent upon its-

A. yield strength

B. Brinell hardness number

C. elastic strength

D. toughness

Click for Answer/Explanation

Correct Answer is B

24. The railway carriage couplings have-

A. square threads

B. buttress threads

C. acme threads

D. knuckle threads

Click for Answer/Explanation

Correct Answer is D

25. If a bearing is designated by the number 305, it means that the bearing is of-

A. medium series whose bore is 5 mm

B. light series whose bore is 5 mm

C. light series whose bore is 25 mm

D. medium series whose bore is 25 mm

Click for Answer/Explanation

Correct Answer is D

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