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Machine Design

Machine Design
The suitable material for belt in agricultural machinery is

Balata gum
Rubber
Cotton duck
Leather

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Direct shear stress only
A combination of bending stress and direct shear stress
Bending stress only
A combination of torsional shear stress and bending

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² compression
3.6 N/mm² compression
3.6 N/mm² tension
7.2 N/mm² tension

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Machine Design
In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

None of these
Left hand
Both A and B
Right hand

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Machine Design
The belt slip occurs due to

Heavy load
Any one of the above
Loose belt
Driving pulley too small

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Machine Design
Yield point in fatigue loading as compared to static loading is

Higher
Depends on other factors
Lower
Same

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