Theory of Machine
Frequency of vibrations is usually expressed in

Number of cycles per hour
Number of cycles per minute
Number of cycles per second
None of these

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Theory of Machine
Crowning on pulleys helps

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

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Theory of Machine
In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

Reduce maximum opening of port to steam
Cause withdrawing or throttling of steam
Reduce length of effective stroke of piston
All of these

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Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane rotation with variable velocity
Restrained to rotate while sliding over another body
In plane translation with variable velocity
In plane motion which is a resultant of plane translation and rotation

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