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Machine Design

Machine Design
The included angle in unified of American National threads is

29°
47°
60°
55°

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Machine Design
An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Tip of the gear and flank of pinion
Flanks of both gear and pinion
Tip of the pinion and flank of gear
Tip of both gear and pinion

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

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

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Machine Design
In worm gears, the pressure angle is __________ the angle between two inclined faces in axial plane.

None of these
Half
Thrice
Twice

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Machine Design
The application of third type levers is found in

Handle of a hand pump
Hand wheel of a punching press
Lever of a loaded safety valve
A pair of tongs

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Machine Design
The size of a gear is usually specified by

Pressure angle
Circular pitch
Diametral pitch
Pitch circle diameter

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