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Theory of Machine

Theory of Machine
The lower pair is a

Closed pair
Sliding pair
Open pair
Point contact pair

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Theory of Machine
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)

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

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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 anticlockwise 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
Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

Flywheel
Governor
D-slide valve
Meyer's expansion valve

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Theory of Machine
The length of a simple pendulum which gives the same frequency as the compound pendulum, is

kG + l₁
(kG + l₁²)/ l₁
(kG² + l₁²)/ l₁
kG² + l₁

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Theory of Machine
The frictional torque transmitted by a disc or plate clutch is same as that of

Flat pivot bearing
Conical pivot bearing
Flat collar bearing
Truncated conical pivot bearing

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