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Theory of Machine

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

Dedendum
Addendum
Clearance
Working depth

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Theory of Machine
The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.

Unpredictable
None of these
Same
Different

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Theory of Machine
The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is

3 Hz
3π Hz
6 Hz
6π Hz

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

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Theory of Machine
Which of the following is an example of sliding pair?

Piston and cylinder of a reciprocating steam engine
Lead screw of a lathe with nut
Shaft with collars at both ends fitted into a circular hole
Ball and a socket joint

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Theory of Machine
When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in _________ directions.

Opposite
Same
Perpendicular
None of these

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