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Machine Design

Machine Design
The shock resistance of steel is increased by adding

Nickel
Cobalt and molybdenum
Chromium
Nickel and chromium

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

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Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.5 × diameter of bolt
1.25 × diameter of bolt
0.75 × diameter of bolt
Diameter of bolt

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Machine Design
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

Ductility
Elasticity
Malleability
Plasticity

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Machine Design
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be

70 to 83%
80 to 90%
45 to 60%
63 to 70%

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Machine Design
In the assembly of pulley, key and shaft

Key is made the weakest
All the three are designed for equal strength
Pulley is made the weakest
Key is made the strongest

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