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Machine Design

Machine Design
The pitch of threads on a Jock nut in comparison to pitch of nut is

Very fine
Finer
Same
Coarser

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Machine Design
The groove angle of the pulley for rope drive is usually

45°
35°
60°
20°

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Machine Design
The efficiency of a riveted joint is equal to

Least of Pt, Ps and Pc/P
Ps /P
Pc /P
Pt /P

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Machine Design
Which of the following is a permanent fastening?

Bolts
Rivets
Keys
Cotters

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Machine Design
Which of the following spring is used in mechanical wrist watch?

Spiral spring
Belleville spring
Torsion spring
Helical compression spring

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Machine Design
When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be _________ the bearing modulus.

5 times
10 times
15 times
20 times

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