Theory of machines MCQs Archives

171. The centrifugal tension in belts

increases power transmitted

decreases power transmitted

have no effect on power transmitted

increases power transm

✅ The correct answer is option C.

172. The height of a Watt’s governor (in metres) is equal to (where N = Speed of the arm and ball about the spindle axis)

8.95/N2

89.5/N2

895/N2

8950/N2

✅ The correct answer is option C.

173. The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)

μ W R

✅ The correct answer is option A.

174. Which of the following is a pendulum type governor?

Watt governor

Porter governor

Hartnell governor

none of these

✅ The correct answer is option A.

175. When two pulleys are connected by means of a cross belt drive, then both the pulleys will rotate in __________ directions.

same

opposite

✅ The correct answer is option B.

176. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is

0°

90°

180°

270°

✅ The correct answer is option C.

177. In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

because of difficulty in manufacturing cam profile

because of loose contact of follower with cam surface

in order to have acceleration in beginning and retardation at the end of stroke within the finite limits

because the uniform ve

✅ The correct answer is option C.

178. The ratio of the number of teeth to the pitch circle diameter in millimetres, is called

circular pitch

diametral pitch

module

none of these

✅ The correct answer is option B.

179. A body is said to vibrate with simple harmonic motion if its acceleration is proportional to the distance from the mean position.

Yes

✅ The correct answer is option A.

180. The motion of a shaft in a circular hole is an example of

completely constrained motion

incompletely constrained motion

successfully constrained motion

none of these

✅ The correct answer is option B.