Machine Dynamics Multiple Choice Questions on “Watt Governor”.
1. In a Hartnell governor, the lift of the sleeve is given by
a) (r1 + r2y/x
b) (r1 + r2x/y
c) (r1 – r2y/x
d) (r1 – r2x/y
Answer: c
Clarification: h = (r1 – r2y/x
and stiffness of the spring, s = S2 – S1/h
2. In a Hartnell governor, the compression of the spring is ______________ the lift of the sleeve.
a) equal to
b) less than
c) greater than
d) none of the mentioned
Answer: a
Clarification: None
3. In a Hartnell governor, the stiffness of the spring is given by
a) S1 + S2/h
b) S2 – S1/h
c) S1 + S2/2h
d) S1 – S2/2h
Answer: b
Clarification: h = (r1 – r2y/x
and stiffness of the spring, s = S2 – S1/h
4. Which of the following is a spring controlled governor?
a) Hartnell governor
b) Hartung governor
c) Wilson-Hartnell governor
d) All of the mentioned
Answer: d
Clarification: None
5. A pendulum type governor is a Watt governor.
a) True
b) False
Answer: a
Clarification: A Hartnell governor is a spring loaded governor.
Watt’s governor is a pendulum type governor.
6. A Porter governor is a
a) dead weight governor
b) pendulum type governor
c) spring loaded governor
d) inertia governor
Answer: b
Clarification: A Hartnell governor is a spring loaded governor.
Watt’s governor is a pendulum type governor.
As Porter governor is the modification of Watt’s governor, so it is also a pendulum type governor.
7. Which of the following governor is used to drive a gramophone?
a) Watt’s governor
b) Porter governor
c) Pickering governor
d) Hartnell governor
Answer: c
Clarification: A Pickering governor is mostly used for driving gramophone. It consists of three straight leaf springs arranged at equal angular intervals round the spindle. Each spring carries a weight at the centre.
8. The sensitiveness of a governor depends upon the lift of the sleeve.
a) True
b) False
Answer: a
Clarification: In general, the greater the lift of the sleeve corresponding to a given fractional change in speed, the greater is the sensitiveness of the governor.
9. For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that
a) governor A is more sensitive than governor B
b) governor B is more sensitive than governor A
c) both governors A and B are equally sensitive
d) none of the mentioned
Answer: a
Clarification: In general, the greater the lift of the sleeve corresponding to a given fractional change in speed, the greater is the sensitiveness of the governor.
10. The sensitiveness of the governor ____________ as the speed range decreases.
a) remains unaffected
b) decreases
c) increases
d) none of the mentioned
Answer: c
Clarification: For a given lift of the sleeve, the sensitiveness of the governor increases as the speed range decreases.