Machine Design
The period during which the cam follower remains at rest, when cam moves, is known as

Dwell period
Constant period
Idle period
Fixed period

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Is maximum at zero speed and decreases monotonically with increase in speed
Becomes minimum at an optimum speed and then increases with further increase in speed
Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed

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