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Theory of Machine

Theory of Machine
In S.H.M., acceleration is proportional to

Rate of change of velocity
Velocity
Displacement
All of these

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Theory of Machine
The two elements of a pair are said to form a higher pair, when they

Are kept in contact by the action of external forces, when in motion
Have a surface contact when in motion
Permit relative motion
Have a line or point contact when in motion

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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)2r
(ω₁ - ω₂)r
ω₁.ω₂.r
(ω₁ + ω₂)r

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Theory of Machine
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

Larger
Smaller
None of the listed here
Smaller OR Larger

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Theory of Machine
Which of the following is an example of sliding pair?

Piston and cylinder of a reciprocating steam engine
Ball and a socket joint
Lead screw of a lathe with nut
Shaft with collars at both ends fitted into a circular hole

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Theory of Machine
Efficiency of a screw jack is given by

tanα/tan (α - φ)
tanα/tan (α +φ)
tan (α + φ)/tanα
tan (α - φ)/tanα

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