71. In order to double the period of a simple pendulum, the length of the string should be
halved
doubled
quadrupled
none of these
✅ The correct answer is option C.
Theory of machines MCQs
73. Scott Russell’s mechanism is made up of sliding pair.
Correct
Incorrect
✅ The correct answer is option A.
74. The swaying couple is due to the
primary unbalanced force
secondary unbalanced force
two cylinders of locomotive
partial balancing
✅ The correct answer is option A.
75. Longitudinal vibrations are said to occur when the particles of a body moves
perpendicular to its axis
parallel to its axis
in a circle about its axis
none of these
✅ The correct answer is option B.
76. The inertia force is equal to the accelerating force in magnitude, but opposite in direction.
Right
Wrong
✅ The correct answer is option A.
77. A mechanism __________ for transmitting or transforming motion.
can be used
can not be used
✅ The correct answer is option A.
79. When the particles of a body moves perpendicular to its axis, then the body is said to have
longitudinal vibration
transverse vibration
torsional vibration
none of these
✅ The correct answer is option B.
80. A shaft carrying three rotors will have
no node
one node
two nodes
three nodes
✅ The correct answer is option C.