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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
In the levers of first type, the mechanical advantage is ________ one.

Equal to
Less than
More than
None of these

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Machine Design
Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and σt = Permissible tensile stress for plate material)

p.t.σt
p.d.σt
(p - d) t.σt

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Machine Design
Which of the following material has the maximum ductility?

Aluminium
Mild steel
Zinc
Copper

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Machine Design
The connecting rod bolts are tightened up with initial tension greater than the external load so that

Joint may not open up
Bolts will not loosen during service
The resultant load on the bolt would not be affected by the external cyclic load
Bolts are weakest elements

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Machine Design
A screw will be self locking, if

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

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