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Theory of Machine

Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Unstable
Stable
Isochronous
Hunt

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Theory of Machine
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

0.4985/ √δS
0.6253/ √δS
0.571/ √δS
0.5615/ √δS

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Theory of Machine
The example of spherical pair is

Ball bearing and roller bearing
Bolt and nut
Lead screw of a lathe
Ball and socket joint

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Theory of Machine
A pantograph is a mechanism with

Rolling pairs
Turning pairs
Lower pairs
Higher pairs

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Theory of Machine
In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.

None of these
Equal to
Less than
Greater than

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Theory of Machine
The factional torque for square thread at the mean radius r while raising load W is given by

T = W.r tan(φ - α)
T = W.r tanα
T = W.r tanφ
T = W.r tan(φ + α)

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