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Theory of Machine

Theory of Machine
In a pantograph, all the pairs are

Turning pairs
Sliding pairs
Self-closed pairs
Spherical pairs

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Theory of Machine
When the body is suspended at the point of suspension, its periodic time and frequency will be ________ as compared to the body suspended at the point of percussion.

Same
None of these
Two times
Four times

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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
Iω²
I ω ωP
(1/2).Iω²

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

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Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Is in motion
None of these
Is at rest
Just begins to slide over the surface of the other body

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Theory of Machine
Pulley in a belt drive acts as

Rolling pair
Cylindrical pair
Sliding pair
Turning pair

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