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Theory of Machine

Theory of Machine
In order to double the period of a simple pendulum, the length of the string should be

Halved
Quadrupled
None of these
Doubled

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ + r₂) sinθ sec2θ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) sinθ

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ cosθ
ω² × OQ tanθ
ω² × OQ
ω² × OQ sinθ

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

½μWR
μwr
¾μWR
²/₃ μWR

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

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Theory of Machine
Klein's construction gives a graphic construction for

Acceleration polygon
Four bar chain mechanism
Velocity polygon
Slider-crank mechanism

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