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Theory of Machine

Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

10
30
34
20

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Theory of Machine
Transmission angle is the angle between

Output link and fixed link
Input link and fixed link
Input link and coupler
Output link and coupler

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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)2r
ω₁.ω₂.r
(ω₁ + ω₂)r

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Theory of Machine
In a kinematic chain, a quaternary joint is equivalent to

Three binary joints
Four binary joints
Two binary joints
One binary joint

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Theory of Machine
What is the number of instantaneous centers for an eight link mechanism?

15
8
28
30

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Theory of Machine
Which of the following is a turning pair?

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

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