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Theory of Machine

Theory of Machine
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.

Turning
Sliding
Screw
Rolling

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Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Coupler link is fixed
Longest link is a fixed link
Smallest link is a fixed link
Slider is a fixed link

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Theory of Machine
In locomotives, the ratio of the connecting rod length to me crank radius is kept very large in order to

Minimize the effect of secondary forces
Minimize the effect of primary forces
Have perfect balancing
To start the locomotive quickly

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

μwr
¾μWR
½μWR
²/₃ μWR

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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)2r
(ω₁ - ω₂)r
(ω₁ + ω₂)r

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Theory of Machine
A reed type tachometer use the principle of

Torsional vibration
Transverse vibration
Longitudinal vibration
Damped free vibration

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