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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
In order to double the period of a simple pendulum, the length of the string should be

None of these
Halved
Quadrupled
Doubled

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

¾μWR
½μWR
²/₃ μWR
μwr

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Theory of Machine
The ratio of the driving tensions for V-belts is __________ times that of flat belts.(Where β = Semi-angle of the groove)

sinβ
cosβ
cosecβ
secβ

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Theory of Machine
A torsional system with discs of moment of inertia I₁ and I₂ as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is 'G'. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to

I₂/G²
I₂/G
G.I₂
G².I₂

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Theory of Machine
The critical speed of a shaft depends upon its

Mass
Stiffness and eccentricity
Mass and stiffness
Stiffness

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