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Theory of Machine

Theory of Machine
A rigid body possesses ________degrees of freedom

One
Six
Two
Four

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Theory of Machine
The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as

Rolling pair
Sliding pair
Turning pair
Spherical pair

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

270° and 360°
0° and 90°
90° and 180°
135° and 315°

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

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

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

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Theory of Machine
The maximum or minimum value of the swaying couple is

± a (1 - c) m.ω².r
± c.m.ω².r
± 2a (1 - c) m.ω².r
± (a/√2) (1 - c) m.ω².r

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