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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Rubber
Balata gum
Leather
Cotton duck

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Machine Design
The included angle between the sides of V-belt is

38°
60°
45°
40°

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Machine Design
A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

None of these
Partially
Either A or B
Fully

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

Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is equal to helix angle
Friction angle is less than helix angle

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Machine Design
The railway carriage couplings have

Square threads
Knuckle threads
Acme threads
Buttress threads

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(θ + sinθ)
4μ sinθ/(2θ + sin 2θ)
2μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)

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