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Theory of Machine

Theory of Machine
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

6π Hz
3 Hz
6 Hz
3π Hz

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Theory of Machine
The brake commonly used in railway trains is

Internal expanding brake
Band brake
Shoe brake
Band and block brake

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Theory of Machine
The axis of precession is __________ to the plane in which the axis of spin is going to rotate.

None of these
Perpendicular
Parallel
Both A and B

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Theory of Machine
A shaft carrying three rotors will have

Two nodes
One node
Three nodes
No node

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Theory of Machine
In a four stroke I.C. engine, the turning moment during the compression stroke is

Negative throughout
Negative during major portion of the stroke
Positive throughout
Positive during major portion of the stroke

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Theory of Machine
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

52.92 N-s/m
18.52 N-s/m
529.2 N-s/m
1.4 N-s/m

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