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Machine Design

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
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Larger
Equal
Larger/smaller depending on diameter of spring coil
Smaller

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.12
1.26
1.58
1.06

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Machine Design
The function of a washer is to

Provide cushioning effect
Provide smooth surface in place of rough surface
Absorb shocks and vibrations
Provide bearing area

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Machine Design
If threads on a bolt are left hand, threads on nut will be

Right hand with same pitch
Right hand with fine pitch
Left hand with same pitch
Could be left or right hand

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

Helical compression spring
Spiral spring
Belleville spring
Torsion spring

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