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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Balata gum
Cotton duck
Rubber
Leather

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

τ
τ/2
2 τ
4 τ

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Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Enhance the load carrying capacity of the jack
Reduce the effort needed for lifting the working load
Prevent the rotation of load being lifted
Reduce the value of frictional torque

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Machine Design
When compared to the rod of the same diameter and material, a wire rope

Is less flexible
Does not provide much warning before failure
Has a much smaller load carrying capacity
Provides much greater time for remedial action before failure

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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
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Reduce vibration
Reduce slip
Ensure uniform loading
Ensure proper alignment

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