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Theory of Machine

Theory of Machine
The relative velocity of B with respect to A in a rigid link AB is

Along AB
Parallel to AB
At 45° to AB
Perpendicular to AB

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Theory of Machine
In under damped vibrating system, the amplitude of vibration

Decreases linearly with time
Decreases exponentially with time
Increases linearly with time
Increases exponentially with time

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Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Compound pendulum
Second's pendulum
Simple pendulum
Torsional pendulum

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ + r₂) cosθ cosec2θ
ω (r₁ r₂) sinθ
ω (r₁ r₂) cosθ
ω (r₁ + r₂) sinθ sec2θ

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ + ω₂)r
(ω₁ - ω₂)r
(ω₁ - ω₂)2r
ω₁.ω₂.r

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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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