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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.

Remain same
Decreases
Increases
None of these

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Theory of Machine
Whirling speed of the shaft is the speed at which

Combination of transverse and longitudinal vibration occurs
Torsional vibrations occur
Shaft tends to vibrate vigorously in transverse direction
Shaft tends to vibrate in longitudinal direction

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Theory of Machine
If two moving elements have surface contact in motion, such pair is known as

Sliding pair
Rolling pair
Surface pair
Higher pair

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Theory of Machine
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

3
4
2
5

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

I₂/G
G.I₂
I₂/G²
G².I₂

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Theory of Machine
The following is the inversion of slider crank chain mechanism

Whitworth quick return mechanism
Hand pump
Oscillating cylinder engine
All of these

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