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Machine Design

Machine Design
Screws used for power transmission should have

Low efficiency
High efficiency
Strong teeth
Very fine threads

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Machine Design
The wire ropes make contact at

Anywhere in the groove of the pulley
Bottom of groove of the pulley
Sides of groove of the pulley
Sides and bottom of groove of the pulley

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Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Tangent key
Feather key
Gib-head key
Woodruff key

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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 shear stress theory
Maximum distortion energy theory

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Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Feather key
Flat saddle key
Wood ruff key
Gib-head key

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Machine Design
The objective of 'crowning' of the flat pulleys of belt drive is to

Increase the belt velocity
Prevent the belt from running off the pulley
Increase the power transmission capacity
Prevent the belt joint from damaging the belt surface

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