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Theory of Machine

Theory of Machine
The secondary unbalanced force is maximum __________ in one revolution of the crank.

Eight times
Two times
Sixteen times
Four times

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Theory of Machine
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω cosθ/(n² - sin²θ)1/2
ω cosθ/(n² - cos²θ)1/2
ω sinθ/(n² - cos²θ)1/2
ω sinθ/(n² - sin²θ)1/2

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Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

m₁ m₂ = r₁ r₂
m₁ r₁ = m₂ r₂
None of these
m₁ r₂ = m₂ r₁

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Theory of Machine
Critical damping is a function of

Mass and natural frequency
Damping coefficient and natural frequency
Mass and stiffness
Mass and damping coefficient

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Theory of Machine
The instantaneous center of a rigid thin disc rolling on a plane rigid surface is located at

The point of contact
The point on the circumference situated vertically opposite to the contact point
An infinite distance on the plane surface
The center of the disc

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Theory of Machine
Tangential acceleration direction is

Perpendicular to angular velocity
Opposite to angular velocity
May be any one of these
Along the angular velocity

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