THEORY OF MACHINE QUIZ

In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be (where ω = Angular speed of the system, ωn = Natural frequency of vibration of the system)

Equal to unity

Zero

Greater than unity

Less than unity

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The Coriolis component of acceleration is taken into account for

Slider crank mechanism

Quick return motion mechanism

All of these

Four bar chain mechanism

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The unbalanced force due to reciprocating masses

Varies in direction but constant in magnitude

Varies in magnitude and direction both

Varies in magnitude but constant in direction

Constant in magnitude and direction both

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In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of difficulty in manufacturing cam profile

Because of loose contact of follower with cam surface

Because the uniform velocity motion is a partial parabolic motion

In order to have acceleration in beginning and retardation at the end of stroke within the finite limits

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A pulley and belt in a belt drive form a

Sliding pair

Rolling pair

Cylindrical pair

Turning pair

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Two pulleys of radii r₁ and r₂ and at distance x apart are connected by means of an open belt drive. The length of the belt is

π (r₁ + r₂) + (r₁ + r₂)²/x + 2x

π (r₁ + r₂) + (r₁ - r₂)²/x + 2x

π (r₁ - r₂) + (r₁ - r₂)²/x + 2x

π (r₁ - r₂) + (r₁ + r₂)²/x + 2x

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If ω/ωn = 2, where co is the frequency of excitation and ωn is the natural frequency of vibrations, then the transmissibility of vibration will the

1

0.5

1.5

2

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A Porter governor is a

Inertia governor

Pendulum type governor

Dead weight governor

Spring loaded governor

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A rigid body possesses ________degrees of freedom

One

Six

Four

Two

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Which of the following is a spring controlled governor?

All of these

Hartung governor

Wilson-Hartnell governor

Hartnell governor

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