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Theory of Machine

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

Stiffness and eccentricity
Mass
Stiffness
Mass and stiffness

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Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

Perpendicular to the link joining the points
None of the listed here
At 45° to the link joining the points
Parallel to the link joining the points

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Theory of Machine
The mechanism in which two are turning pairs and two are sliding pairs, is called a

Scotch yoke mechanism
All of these
Elliptical trammel
Double slider crank chain

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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

1.4 N-s/m
18.52 N-s/m
52.92 N-s/m
529.2 N-s/m

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Theory of Machine
The essential condition of placing the two masses, so that the system becomes dynamically equivalent, is (where l₁ and l₂ = Distance of two masses from the centre of gravity of the body, and kG = Radius of gyration of the body)

l₁l₂ = kG
l₁l₂ = kG²
l₂ = kG
l₁ = kG

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Theory of Machine
In order to facilitate starting of locomotive in any position, the cranks of a locomotive with two cylinders, are placed at

180° to each other
90° to each other
120° to each other
45° to each other

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