111. The lead screw of a lathe with nut forms a
rolling pair
sliding pair
screw pair
turning pair
✅ The correct answer is option C.
Theory of machines MCQs
112. The ratio of maximum fluctuation of energy to the workdone per cycle is called
fluctuation of energy
maximum fluctuation of energy
coefficient of fluctuation of energy
none of these
✅ The correct answer is option C.
113. The brake commonly used in motor cars is internal expanding brake.
TRUE
FALSE
✅ The correct answer is option A.
114. In a simple harmonic motion, the velocity vector with respect to displacement vector
is in phase
leads by 90°
leads by 180°
lags by 90°
✅ The correct answer is option D.
115. When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a
D-slide valve
governor
Meyer’s expansion valve
flywheel
✅ The correct answer is option B.
117. A spring controlled governor is said to be isochronous when the controlling force
increases as the radius of rotation decreases
increases as the radius of rotation increases
decreases as the radius of rotation increases
remains constant for a
✅ The correct answer is option D.
118. If the damping factor for a vibrating system is unity, then the system will be
over damped
under damped
critically damped
without vibrations
✅ The correct answer is option C.
119. When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.
Right
Wrong
✅ The correct answer is option B.
120. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a left turn. The effect of gyroscopic couple acting on it will be
to raise the bow and stern
to lower the bow and stern
to raise the bow and lower the stern
to raise the stern and
✅ The correct answer is option C.