Q. 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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Q. In a coupling rod of a locomotive, each of the four pairs is a __________ pair.

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Q. The sliding pairs, turning pairs and screw pairs form lower pairs.

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Q. When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω²r.

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Q. A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

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Q. The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to

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Q. The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

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Q. A pair of friction discs is an example of rolling pair.

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Q. In order to balance the reciprocating masses,

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Q. In a screw jack, the effort required to lower the load W is given by

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Q. An automobile steering gear is an example of

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Q. If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach

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Q. In a circular arc cam with roller follower, the acceleration in any position of the lift will depend only upon

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Q. 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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Q. The factor which affects the critical speed of a shaft is

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Q. The partial balancing of reciprocating parts in locomotives produces

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Q. The pair is known as a higher pair, when the relative motion between the elements of a pair is

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Q. When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.

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Q. The Whitworth quick return motion mechanism is formed in a slider crank chain when the

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Q. The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

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