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Machine Design

Machine Design
Which is positive drive?

Flat belt drive
Crossed belt drive
V belt drive
Timing belt

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Machine Design
The application of second type levers is found in

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

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (2a/b)]
σ [1 + (b/2a)]
σ [1 + (3a/b)]
σ [1 + (b/3a)]

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Machine Design
The resistance to fatigue of a material is measured by

Endurance limit
Ultimate tensile strength
Elastic limit
Young's modulus

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Machine Design
In a multiple V-belt drive, if one of the belts break, then

Only the broken belt is replaced
The entire set of belts is replaced
The broken belt need not to be replaced
The broken belt and the belt on either side of it, is replaced

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Machine Design
A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

None of these
Greater than
Equal to
Less than

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