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Theory of Machine

Theory of Machine
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.

Rolling
Sliding
Screw
Turning

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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)

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

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Theory of Machine
The stress induced in a body will be shear stress, when it is subjected to

Transverse vibrations
None of these
Longitudinal vibrations
Torsional vibrations

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Theory of Machine
The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

Equal to 2
Less than 2
Greater than 2
Equal to 1

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Theory of Machine
The lower pairs are _________ pairs.

Force-closed
None of these
Friction closed
Self-closed

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Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

fn/2
2 fn
4 fn
8 fn

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