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)2r
ω₁.ω₂.r

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Theory of Machine
For dynamic balancing of a shaft

None of these
The net couple due to the dynamic forces acting on the shaft is equal to zero
Both (A) and (B)
The net dynamic force acting on the shaft is equal to zero

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
All of these
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

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