In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
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Correct Answer:
0.6
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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)
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Correct Answer:
(1 - c)m.ω2.r(cos θ - sin θ)
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The cam follower generally used in automobile engines is
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Correct Answer:
Spherical faced follower
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The maximum fluctuation of energy is the
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Correct Answer:
Difference between the maximum and minimum energies
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The pair is known as a higher pair, when the relative motion between the elements of a pair is
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Partly turning and partly sliding
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Which of the following is a turning pair?
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Shaft with collars at both ends fitted into a circular hole
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The static friction
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All of these
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When the two elements of a pair have a surface contact when relative motion takes place and the surface of one element slides over the surface of the other, the pair formed is known as a
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Correct Answer:
Lower pair
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Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
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Correct Answer:
Right
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In a coupling rod of a locomotive, each of the four pairs is a __________ pair.
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Turning
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The factor which affects the critical speed of a shaft is
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Correct Answer:
All of these
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In order to give the primary balance of the reciprocating parts of a multi-cylinder in-line engines,
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Both the algebraic sum of the primary forces must be equal to zero and the algebraic sum of the couples about any point in the plane of the primary forces must be equal to zero
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The gears are termed as medium velocity gears, if their peripheral velocity is
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Correct Answer:
3 - 15 m/s
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An automobile steering gear is an example of
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Lower pair
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In order to balance the reciprocating masses,
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Both primary forces and couples must be balanced and secondary forces and couples must be balanced
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When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
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Correct Answer:
Unstable
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A disturbing mass m1 attached to the rotating shaft may be balanced by a single mass m2 attached in the same plane of rotation as that of m1, such that (where r1 and r2 are the radii of rotation of m1 and m2 respectively)
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Correct Answer:
M1r1 = m2r2
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A pair of friction discs is an example of rolling pair.
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Correct Answer:
False
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The acceleration of the particle moving with simple harmonic motion is inversely proportional to the displacement of the particle from the mean position.
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Correct Answer:
No
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The dynamic friction is the friction experienced by a body, when the body
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Correct Answer:
Is in motion
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