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Theory of Machine

Theory of Machine
The velocity of a body moving with simple harmonic motion is __________ at the mean position.

Maximum
Minimum
Zero
None of these

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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) 2r
(ω₁ + ω₂) r
(ω₁ - ω₂) r
ω₁.ω₂.r

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Theory of Machine
A watt's governor can work satisfactorily at speeds from

200 to 300 r.p.m.
80 to 100 r.p.m.
60 to 80 r.p.m.
100 to 200 r.p.m.

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Theory of Machine
The maximum or minimum value of the swaying couple is

± c.m.ω².r
± a (1 - c) m.ω².r
± 2a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r

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Theory of Machine
The mechanism in which two are turning pairs and two are sliding pairs, is called a

All of these
Scotch yoke mechanism
Double slider crank chain
Elliptical trammel

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Theory of Machine
The Coriolis component of acceleration leads the sliding velocity by

135°
45°
180°
90°

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