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Theory of Machine

Theory of Machine
The primary unbalanced force is maximum _________ in one revolution of the crank.

Twice
Sixteen times
Four times
Eight times

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

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Theory of Machine
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

(S₁ + S₂) / 2h
(S₁ - S₂) / 2h
(S₁ + S₂) / h
(S₁ - S₂) / h

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Theory of Machine
For a kinematic chain to be considered as mechanism

One link should be fixed
None of the links should be fixed
Two links should be fixed
There is no such criterion

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Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

The pressure developed being high provides tight sealing
Power absorbed is less
Both wear and power absorbed are low
Wear is less

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Theory of Machine
The frequency of oscillation at compared to earth will be

2.44 times less
6 times more
2.44 times more
6 times less

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