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Theory of Machine

Theory of Machine
In a rigid link OA, velocity of 'A' w.r.t. 'O' will be

At 45° to OA
Along AO
Parallel to OA
Perpendicular to OA

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

2 fn
8 fn
fn/2
4 fn

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Theory of Machine
Governor is used in automobile to

Maintain constant engine speed
Limit the vehicle speed
Maximize the fuel economy
Decrease the variation of speed

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Theory of Machine
The angle of inclination of the plane, at which the body begins to move down the plane is called

Angle of friction
Angle of projection
None of these
Angle of repose

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

Power absorbed is less
The pressure developed being high provides tight sealing
Both wear and power absorbed are low
Wear is less

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Theory of Machine
The partial balancing means

Balancing partially revolving masses
Balancing partially reciprocating masses
All of these
Best balancing of engines

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