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Theory of Machine

Theory of Machine
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

90°
0°
180°
270°

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Theory of Machine
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

(1/2). I ω ωP
(1/2).Iω²
Iω²
I ω ωP

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Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

1, 2 and 4
2, 3 and 4
1, 3 and 4
1, 2 and 3

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Theory of Machine
Critical damping is a function of

Mass and stiffness
Damping coefficient and natural frequency
Mass and natural frequency
Mass and damping coefficient

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Theory of Machine
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ω/ωn is

Equal to 1
Equal to 2
Greater than 2
Less than 2

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Theory of Machine
The unbalanced force due to reciprocating masses

Varies in magnitude and direction both
Varies in direction but constant in magnitude
Constant in magnitude and direction both
Varies in magnitude but constant in direction

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