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Theory of Machine

Theory of Machine
The periodic time of one oscillation for a simple pendulum is

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

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Theory of Machine
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r (cosθ - sinθ)
m.ω².r cosθ
m.ω².r sinθ
(1 - c).m.ω².r (cosθ - sinθ)

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is (Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

¾μWR
½μWR
μwr
²/₃ μWR

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Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Slider is a fixed link
Longest link is a fixed link
Coupler link is fixed
Smallest link is a fixed link

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Theory of Machine
A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

1.4 N-s/m
52.92 N-s/m
18.52 N-s/m
529.2 N-s/m

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Theory of Machine
The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

Successfully constrained motion
None of these
Completely constrained motion
Incompletely constrained motion

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