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Theory of Machine

Theory of Machine
For fluctuating loads, well suited bearing is

Roller bearing
Thrust bearing
Needle roller bearing
Ball bearing

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Theory of Machine
The method of direct and reverse cranks is used in engines for

Vibration analysis
The control of speed fluctuations
Balancing of forces and couples
Kinematic analysis

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

Complex conjugate
Equal
None of these
Real

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Theory of Machine
In a multiple V-belt drive, if one of the belts is broken, then we should replace

The broken belt and the belts on either side of it
None of these
The broken belt only
All the belts

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Theory of Machine
Flexible coupling is used because

It transmits shocks gradually
It prevents shock transmission and eliminates stress reversals
It is easy to disassemble
It is easy to engage and disengage

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Theory of Machine
When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Lower pair
Higher pair
Self-closed pair
Force-closed pair

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