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Theory of Machine

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

Pantograph
Valve and valve gears
All of these
Gyroscope

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Theory of Machine
When the addenda on pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values, then the length of the path of contact is given by (where r = Pitch circle radius of pinion, R = Pitch circle radius of wheel, and φ = Pressure angle)

[(r + R) sinφ]/2
[(r + R) cosφ]/2
[(r² + R²) sinφ]/2
[(r² + R²) cosφ]/2

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Theory of Machine
In automobiles the power is transmitted from gear box to differential through

Bevel gear
Universal joint
Knuckle joint
Hooke's joint

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Theory of Machine
When the sleeve of a Porter governor moves upwards, the governor speed

Decreases
Increases
First increases and then decreases
Remain unaffected

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Theory of Machine
The pitching of a ship produces forces on the bearings which act __________ to the motion of the ship.

Horizontally and perpendicular
Vertically and perpendicular
Vertically and parallel
Horizontally and parallel

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Theory of Machine
The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called

Clearance
Addendum
Dedendum
Working depth

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