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Theory of Machine

Theory of Machine
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.

Same as
None of these
Less than
More than

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Theory of Machine
In a screw jack, the effort required to lower the load W is given by

P = W cos(α + φ)
P = W tan(φ - α)
P = W tan(α + φ)
P = W tan(α - φ)

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Theory of Machine
Torsional vibrations are said to occur when the particles of a body moves

Parallel to its axis
Perpendicular to its axis
None of these
In a circle about its axis

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Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced completely
Not balanced
Balanced by secondary forces
Balanced partially

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Theory of Machine
Efficiency of a screw jack is given by

tanα/tan (α +φ)
tan (α - φ)/tanα
tanα/tan (α - φ)
tan (α + φ)/tanα

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

Mass
Mass and stiffness
Stiffness and eccentricity
Stiffness

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