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Theory of Machine

Theory of Machine
If ‘D₁’ and ‘D₂’ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁
D₁/D₂
D₁.D₂
D₂/D₁

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Theory of Machine
Which of the following is an open pair?

Ball and socket joint
Cam and follower
Journal bearing
Lead screw and nut

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Theory of Machine
In a simple harmonic motion, the velocity vector with respect to displacement vector

Lags by 90°
Leads by 180°
Is in phase
Leads by 90°

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Magnitude of the forces on journal
Angular velocity of journal
Clearance between journal and bearing
Radius of journal

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Theory of Machine
The Ackermann steering mechanism is preferred to the Davis type in automobiles because

The former is mathematically accurate
The former is most economical
The former is most rigid
The former is having turning pair

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Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

At 45° to line as per (A)
Perpendicular to line as per (A)
Not possible to determine with these data
Joining the corresponding points

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