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Machine Design

Machine Design
The helix angle for single helical gears ranges from

20° to 35°
35° to 50°
15° to 20°
10° to 15°

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

None of these
Equal to 50%
Less than 50%
More than 50%

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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
In designing a connecting rod, it is considered like __________ for buckling about Y-axis.

One end fixed and the other end free
Both ends fixed
One end fixed and the other end hinged
Both ends hinged

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Machine Design
Rivets are generally specified by

Thickness of plates to be riveted
Diameter of head
Nominal diameter
Length of rivet

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Machine Design
Oil in journal bearing should be applied at the point where load is

Any one of the above
Average
Nil or lightest
Maximum

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