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Theory of Machine

Theory of Machine
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

0°
90°
180°
360°

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Theory of Machine
The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m).(dx/dt) + (s/m).x = 0, if the roots of the equation are __________ then the system will be under damped.

Complex conjugate
Equal
None of these
Real

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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

0.4
0.8
0.2
0.6

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Theory of Machine
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.

Independent of
Equal to
Directly proportional to
Inversely proportional to

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Theory of Machine
When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

Meyer's expansion valve
D-slide valve
Governor
Flywheel

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Theory of Machine
The power from the engine to the rear axle of an automobile is transmitted by means of

Hooke's joint
Bevel gears
Spur gears
Worm and worm wheel

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