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Theory of Machine

Theory of Machine
The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

None of these
Maximum
Zero
Minimum

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Theory of Machine
The lower pairs are _________ pairs.

Force-closed
None of these
Self-closed
Friction closed

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

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

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

m₁ r₁ = m₂ r₂
m₁ m₂ = r₁ r₂
m₁ r₂ = m₂ r₁
None of these

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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 3
1, 2 and 4
2, 3 and 4

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Theory of Machine
In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

15°-25°
10°-15°
25°-30°
30°-40°

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