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Theory of Machine

Theory of Machine
If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

2
1
0.5
1.5

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

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

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Theory of Machine
The length of a simple pendulum which gives the same frequency as the compound pendulum, is

(kG + l₁²)/ l₁
kG + l₁
(kG² + l₁²)/ l₁
kG² + l₁

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

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Theory of Machine
The minimum force required to slide a body of weight W on a rough horizontal plane is

W cosecθ
W cosθ
W tanθ
W sinθ

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Theory of Machine
The balancing of a rigid rotor can be achieved by appropriately placing balancing masses in

A single plane
Four planes
Three planes
Two planes

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