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Theory of Machine

Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

15
8
28
30

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Theory of Machine
The values of velocity and acceleration of piston at near dead center for a slider-crank mechanism will be

0, and more than co2r
0, 0
cor, 0
0, and less than coV

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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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Theory of Machine
Whirling speed of the shaft is the speed at which

Shaft tends to vibrate vigorously in transverse direction
Shaft tends to vibrate in longitudinal direction
Torsional vibrations occur
Combination of transverse and longitudinal vibration occurs

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Theory of Machine
With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by

2E²CS
EC S/2
2ECS²
2ECS

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Theory of Machine
The instantaneous centers which vary with the configuration of mechanism are called

Neither fixed nor permanent instantaneous centers
None of these
Permanent instantaneous centers
Fixed instantaneous centers

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