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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Turning pairs
Lower pairs
Higher pairs
Rolling pairs

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Theory of Machine
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Damped vibration
Forced vibration
Free vibration
Under damped vibration

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Theory of Machine
A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Data is not sufficient to determine same
Kinematically sound
Soundness would depend upon which link is kept fixed
Not sound

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Theory of Machine
Shaft revolving in a bearing is the following type of pair

Cylindrical pair
Spherical pair
Lower pair
Higher pair

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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
The frequency of oscillation at compared to earth will be

2.44 times less
6 times less
6 times more
2.44 times more

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