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Theory of Machine

Theory of Machine
Which of the following mechanism is obtained from lower pair?

Pantograph
Gyroscope
All of these
Valve and valve gears

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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
²/₃ μWR
½μWR

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Theory of Machine
The magnitude of linear velocity of a point B on a link AB relative to point A is, (Where ω = Angular velocity of the link AB)

(ω × AB)²
ω × (AB)²
ω² × AB
ω × AB

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Theory of Machine
In a reciprocating steam engine, which of the following forms a kinematic link?

Cylinder and piston
Flywheel and engine frame
Piston rod and connecting rod
Crankshaft and flywheel

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

μ W R cosecα
(3/4) μ W R cosecα
(2/3) μ W R cosecα
(1/2) μ W R cosecα

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Theory of Machine
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

270° and 360°
90° and 180°
180° and 270°
45° and 225°

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