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Theory of Machine

Theory of Machine
The lead screw of a lathe with nut forms a

Screw pair
Turning pair
Rolling pair
Sliding pair

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

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

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Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Moderate speed
Slow speed
Highs peed
Any one of these

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Theory of Machine
A point on a link connecting double slider crank chain traces a

Ellipse
Hyperbola
Circle
Parabola

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

(1/2) μ W R
(2/3) μ W R
(3/4) μ W R
μ W R

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Theory of Machine
The number of centers in a crank driven slider crank mechanism is

2
6
4

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