Theory of Machine
To connect two parallel and coplanar shafts the following type of gearing is used

None of the listed here
Bevel gear
Spur gear
Spiral gear

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Theory of Machine
Crowning on pulleys helps

For automatic adjustment of belt position so that belt runs centrally
Increase belt and pulley life
In increasing velocity ratio
In decreasing the slip of the belt

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Varies as the square root of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

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