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Theory of Machine

Theory of Machine
A mechanism consisting of four links is called a __________ mechanism.

Compound
Simple
None of these
Binary

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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 pulley and belt in a belt drive form a

Cylindrical pair
Sliding pair
Turning pair
Rolling pair

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Theory of Machine
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft, and tan φ = Coefficient of friction between the shaft and bearing)

r sinφ
(r/2) cosφ
r cosφ
r tanφ

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Theory of Machine
A reed type tachometer use the principle of

Torsional vibration
Transverse vibration
Longitudinal vibration
Damped free vibration

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Theory of Machine
The swaying couple is due to the

Primary unbalanced force
Two cylinders of locomotive
Secondary unbalanced force
Partial balancing

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