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Theory of Machine

Theory of Machine
When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to

One
Zero
π/2
π

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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
The factor which affects the critical speed of a shaft is

Span of shaft
All of the listed here
Diameter of disc
Eccentricity

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

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

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Theory of Machine
At the nodal point in a shaft, the amplitude for torsional vibration will be

Maximum
Infinity
Minimum
Zero

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Theory of Machine
According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centers lie on A. A triangle

A point
A triangle
Two lines
A straight line

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