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Theory of Machine

Theory of Machine
For fluctuating loads, well suited bearing is

Needle roller bearing
Roller bearing
Thrust bearing
Ball bearing

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Theory of Machine
A system in dynamic balance implies that

There will absolutely no wear of bearings
The system is critically damped
There is no critical speed in the system
The system is also statically balanced

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Theory of Machine
TJIE horse power transmitted by a belt is dependent upon

Tension on tight side of belt
Tension on slack side of belt
All of these
Radius of pulley

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Theory of Machine
A disc is a spinning with an angular velocity ω rad/s about the axis of spin. The couple applied to the disc causing precession will be (where I = Mass moment of inertia of the disc, and ωP = Angular velocity of precession of the axis of spin)

(1/2).Iω²
(1/2). I ω ωP
Iω²
I ω ωP

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

270° and 360°
0° and 90°
135° and 315°
90° and 180°

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

6π Hz
6 Hz
3π Hz
3 Hz

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