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Theory of Machine

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

Gyroscope
All of these
Valve and valve gears
Pantograph

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

ω² (R - r₁) sinθ
ω² r₁ sinθ
ω² R cosθ
ω² (R - r₁) cosθ

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

½μWR
¾μWR
μwr
²/₃ μWR

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Theory of Machine
Frequency of vibrations is usually expressed in

Number of cycles per second
None of these
Number of cycles per hour
Number of cycles per minute

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Theory of Machine
Which of the following would constitute a link?

Piston rod and cross head
Piston and piston rod
Piston, piston rod and cross head
Piston, crank pin and crank shaft

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Theory of Machine
When two links are connected by a pin joint, their instantaneous center lies

On their point of contact
At the center of curvature
At the center of circle
At the pin joint

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