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Theory of Machine

Theory of Machine
The secondary unbalanced force is maximum __________ in one revolution of the crank.

Sixteen times
Two times
Four times
Eight times

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Theory of Machine
The unbalanced force due to revolving masses

Varies in magnitude and direction both
Varies in direction but constant in magnitude
Constant in magnitude and direction both
Varies in magnitude but constant in direction

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

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

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Theory of Machine
The flank of the tooth is the surface of the tooth __________ the pitch surface.

None of these
Above
At
Below

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Theory of Machine
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)

1/2π × √(g/δ)
Any one of the listed here
1/2π × √(s/m)
0.4985/√δ

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Theory of Machine
Which of the following is a turning pair?

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

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