91. The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)
sin α =
cos α =
tan α =
cot α =
✅ The correct answer is option C.
Theory of machines MCQs
92. In Meyer’s expansion valve, the expansion valve is driven by an eccentric having an angle of advance from
50° – 60°
60° – 70°
70° – 80°
80° – 90°
✅ The correct answer is option D.
93. In a Hartnell governor, the compression of the spring is __________ the lift of the sleeve.
equal to
less than
greater than
✅ The correct answer is option A.
94. The natural frequency of free transverse vibrations is same as that of free longitudinal vibrations.
Right
Wrong
✅ The correct answer is option A.
95. A reed type tachometer use the principle of
longitudinal vibration
torsional vibration
transverse vibration
damped free vibration
✅ The correct answer is option C.
96. For dynamic balancing of a shaft
the net dynamic force acting on the shaft is equal to zero
the net couple due to the dynamic forces acting on the shaft is equal to zero
both (a) and (b)
none of the above
✅ The correct answer is option C.
97. A machine mounted on a single coil spring has a period of free vibration of tp . If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will become
tp/16
tp/4
4 tp
16 tp
✅ The correct answer is option B.
98. The instantaneous centre of a rigid thin disc rolling on a plane rigid surface is located at
the centre of the disc
the point of contact
an infinite distance on the plane surface
the point on the circu
✅ The correct answer is option B.