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Theory of Machine

Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

20
34
10
30

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Theory of Machine
Which of the following mechanisms produces mathematically an exact straight line motion?

Peaucellier's mechanism
Tchebicheff mechanism
Watt mechanism
Grasshopper mechanism

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

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

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Theory of Machine
The partial balancing of reciprocating parts in locomotives produces

Hammer blow
Variation in tractive force along the line of stroke
Swaying couple
All of these

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Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

None of the listed here
Parallel to the link joining the points
At 45° to the link joining the points
Perpendicular to the link joining the points

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Theory of Machine
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the left. The effect of gyroscopic couple on the aeroplane will be

To raise the nose and dip the tail
To dip the nose and raise the tail
To dip the nose and tail
To raise the nose and tail

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