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Theory of Machine

Theory of Machine
Which of the following mechanism is obtained from lower pair?

Valve and valve gears
All of these
Gyroscope
Pantograph

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Theory of Machine
In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO. The acceleration of the piston P with respect to the crank-pin C is given by

ω² × NO
ω² × CN
ω² × QN
ω² × CO

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Theory of Machine
The velocity of the rubbing surface __________ with the distance from the axis of the bearing.

Decreases
Increases
None of these
Remain same

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Theory of Machine
The cam follower generally used in aircraft engines is

Knife edge follower
Flat faced follower
Spherical faced follower
Roller follower

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Theory of Machine
An imaginary circle which by pure rolling action, gives the same motion as the actual gear, is called

Dedendum circle
Pitch circle
Clearance circle
Addendum circle

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Theory of Machine
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ωR cosθ
ω(R - r₁) sinθ
ω(R - r₁) cosθ
ωr₁ sinθ

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