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Theory of Machine

Theory of Machine
If there are L number of links in a mechanism, then number of possible inversions is equal to

L + 2
L + 1
L
L - 1

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Theory of Machine
For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

Governor B is more sensitive than governor A
Governor A is more sensitive than governor B
Both governors A and B are equally sensitive
None of these

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Theory of Machine
The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction)

α = 45° - φ/2
α = 45° + φ/2
α = 90° - φ
α = 90° + φ

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Theory of Machine
The method of direct and reverse cranks is used in engines for

Balancing of forces and couples
The control of speed fluctuations
Kinematic analysis
Vibration analysis

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Theory of Machine
The D-slide valve is also known as

Inside admission valve
None of these
Outside admission valve
Piston slide valve

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

Spherical faced follower
Roller follower
Flat faced follower
Knife edge follower

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