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Machine Design

Machine Design
The groove angle of pulleys for V-belt is

420 to 450
More than 400
340 to 360
300 to 320

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Machine Design
The objective of idler pulley in belt drive is to

Decrease the tendency of belt to slip
Increase the power transmission capacity
Increase the wrap angle and belt tension
All the above objectives

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

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

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Machine Design
Shaft coupling is used in machinery to

Introduce mechanical flexibility
Introduce protection against over loads
Reduce the transmission of shock loads
All of these

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Machine Design
The helix angle for double helical gears may be made up to

45°
75°
60°
90°

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Machine Design
Which of the following is a permanent fastening?

Rivets
Keys
Bolts
Cotters

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