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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Rubber
Leather
Cotton duck
Balata gum

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Machine Design
The root angle of a bevel gear is equal to

Pitch angle + addendum angle
Pitch angle + dedendum angle
Pitch angle - addendum angle
Pitch angle - dedendum angle

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Machine Design
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Maximum principal stress theory
Maximum strain energy theory
Maximum distortion energy theory
Maximum shear stress theory

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Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

All of these
Shear
Compression
Tension

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Machine Design
In block brakes, the ratio of shoe width to wheel diameter is taken between

0.25 and 0.50
0.75 and 1
0.50 and 0.75
0.1 and 0.25

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Machine Design
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by

Z/pN
ZN/p
N/Zp
p/ZN

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