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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Leather
Cotton duck
Rubber
Balata gum

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Machine Design
The notch angle of the Izod impact test specimen is

20°
10°
30°
45°

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = 1.6√t
d = √t
d = 2√t
d = 6√t

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Machine Design
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

Dynamic load
Static as well as dynamic load
Static load
Completely reversed load

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Machine Design
The shock absorbing capacity of a bolt may be increased by

Increasing its shank diameter
Decreasing its shank diameter
Tightening the bolt properly
Making the shank diameter equal to core diameter of thread

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Equal to
None of these
Larger than
Smaller than

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