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Theory of Machine

Theory of Machine
A cam mechanism imparts following motion

Reciprocating
All of these
Rotating
Oscillating

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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)r
(ω₁ - ω₂)2r

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Theory of Machine
In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω sinθ/(n² - cos²θ)1/2
ω cosθ/(n² - sin²θ)1/2
ω sinθ/(n² - sin²θ)1/2
ω cosθ/(n² - cos²θ)1/2

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Theory of Machine
In automobiles the power is transmitted from gear box to differential through

Hooke's joint
Bevel gear
Universal joint
Knuckle joint

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Theory of Machine
Carnot cycle is

an irreversible cycle
a semi-reversible cycle
a reversible cycle
a quasi static cycle

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Theory of Machine
If ω/ωn is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

180°
0°
360°
90°

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