Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Permanent instantaneous centers
Fixed instantaneous centers
None of these
Neither fixed nor permanent instantaneous centers

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Theory of Machine
Crowning on pulleys helps

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

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Theory of Machine
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

Become equal to 2R
Become equal to R/4
Become equal to R/2
Remain same as before

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