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Theory of Machine

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

Eight times
Twice
Four times
Sixteen times

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Theory of Machine
The rotating shafts tend to vibrate violently at whirling speeds because

Resonance is caused due to the heavy mass of the rotor
The system is unbalanced
Bearing centre line coincides with the axis
The shafts are rotating at very high speeds

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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 + l₁
(kG² + l₁²)/ l₁

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Theory of Machine
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

Less than sum of other two
There is no such relationship
Greater than sum of other two
Equal to sum of other two

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Theory of Machine
The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

Both (A) and (B)
None of these
0° and 90°
180° and 360°

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Theory of Machine
When one of the links of a kinematic chain is fixed, the chain is known as a

Machine
Mechanism
Inversion
Structure

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