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Theory of Machine

Theory of Machine
Cross head and guides form a

Turning pair
Lower pair
Sliding pair
Higher pair

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Theory of Machine
In railway axle boxes, the bearing used is

Cylindrical roller bearing
Deep groove ball bearing
Double row spherical roller bearing
Double row self aligning ball bearing

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Theory of Machine
The tendency of a body to resist change from rest or motion is known as

Inertia
Mass
Resisting force
Friction

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Theory of Machine
A spring controlled governor is found unstable. It can be made stable by

Increasing the spring stiffness
Increasing the ball mass
Decreasing the ball mass
Decreasing the spring stiffness

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Theory of Machine
In a Hartnell governor, the lift of the sleeve is given by (where r₁ and r₂ = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)

(r₁ - r₂) (x/y)
(r₁ + r₂) (x/y)
(r₁ - r₂) (y/x)
(r₁ + r₂) (y/x)

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Theory of Machine
The minimum periodic time of a compound pendulum is

2π. √(2kG/g)
(1/2π). √(2kG/g)
2π. √(kG/g)
(1/2π). √(kG/g)

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