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Theory of Machine

Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Decreases
None of these
Remain same
Increases

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / 2h
(S₁ - S₂) / h
(S₁ + S₂) / h
(S₁ - S₂) / 2h

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Theory of Machine
The two elements of a pair are said to form a _________ when they permit relative motion between them.

Sliding pair
Kinematic pair
Open pair
None of these

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Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Decreases
First increases and then decreases
Remain unaffected
Increases

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Theory of Machine
A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

W CE / CS
W CE / 2CS
2 W CE / CS
W CS / 2CE

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Theory of Machine
The approximate straight line mechanism is a

Four bar linkage
6 bar linkage
8 bar linkage
3 bar linkage

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