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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

0.2
0.6
0.4
0.8

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Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

Minimum
Maximum
None of these
Zero

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Theory of Machine
There are six gears A, B, C, D, E and F in a compound train. The numbers of teeth in the gears are 20, 60, 30, 80, 25 and 75 respectively. The ratio of angular speeds of the driven (F) to the driver (A) of the drive is

12
1/8
4/15
1/24

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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)

½μWR
μwr
²/₃ μWR
¾μWR

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Theory of Machine
In a kinematic chain, a quaternary joint is equivalent to

Three binary joints
One binary joint
Four binary joints
Two binary joints

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Theory of Machine
Which of the below are inversions of slider crank mechanism? 1. Oscillating cylinder engine mechanism 2. Toggle mechanism 3. Radial cylinder engine mechanism 4. Quick return mechanism

1, 2 and 3
1, 2 and 4
2, 3 and 4
1, 3 and 4

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