Theory of Machines MCQ with Answers

21) When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.

Answer is:

Wrong

22) In under damped vibrating system, the amplitude of vibration

Answer is:

decreases exponentially with time

23) The dynamic friction is the friction experienced by a body, when the body

Answer is:

is in motion

Explanation:

The friction, experienced by a body, when in motion, is known as dynamic friction or kinetic friction. Dynamic friction is always less than static friction. The dynamic friction is of three types, i.e. sliding friction, rolling friction and pivot friction.

24) The steering of a ship means

Answer is:

turning of a complete ship in a curve towards right or left, while it moves forward

25) 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, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination o

Answer is:

21) When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.

Wrong

22) In under damped vibrating system, the amplitude of vibration

decreases exponentially with time

23) The dynamic friction is the friction experienced by a body, when the body

is in motion

24) The steering of a ship means

turning of a complete ship in a curve towards right or left, while it moves forward

25) 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, ? = Angular speed of crank, r = Radius of crank, and ? = Angle of inclination o

(1 - c)m.?2.r(cos ? - sin ?)

(1 - c)m.?².r(cos ? - sin ?)