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Theory of Machine

Theory of Machine
In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to

0.8
0.6
0.4
0.2

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Theory of Machine
When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be

ω²r. n/(n - 1)
ω²r. (n - 1)/n
ω²r. (n + 1)/n
ω²r. n/(n + 1)

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Theory of Machine
In involute gears, the pressure angle is

Dependent on the size of gears
Dependent on the size of teeth
Always variable
Always constant

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Angular velocity of journal
Clearance between journal and bearing
Radius of journal
Magnitude of the forces on journal

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Theory of Machine
When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

To raise the stern and lower the bow
To move the ship towards starboard
To raise the bow and lower the stern
To move the ship towards port side

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Theory of Machine
Kinematic pairs are those which have two elements that

Have surface contact
Have line contact
Permit relative motion
Are held together

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