1. Isochronism in a governor is desirable when
a) the engine operates at low speeds
b) the engine operates at high speeds
c) the engine operates at variable speeds
d) one speed is desired under one load
Explanation: The isochronous governor is not of practical use because the sleeve will move to one of its extreme positions immediately the speed deviates from the isochronous speed.
2. The power of a governor is equal to
a) (c2/1 + 2c )(m + M) h
b) (2c2/1 + 2c )(m + M) h
c) (3c2/1 + 2c )(m + M) h
d) (4c2/1 + 2c )(m + M) h
Explanation: (4c2/1 + 2c )(m + M) h
3. When the relation between the controlling force (FC) and radius of rotation (r) for a spring controlled governor is FC = a.r + b, then the governor will be
a) stable
b) unstable
c) isochronous
d) none of the mentioned
Explanation: For the governor to be stable, the controlling force (FC) must increase as the radius of rotation (r) increases, i.e. FC / r must increase as r increases.
4. For a governor, if FC is the controlling force, r is the radius of rotation of the balls, the stability of the governor will be ensured when
a) dFC /dr > FC/r
b) dFC /dr < FC /r
c) dFC /dr = 0
d) none of the mentioned
Explanation: dFC /dr > FC/r
5. 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
Explanation: h = (r1 – r2y/x
and stiffness of the spring, s = S2 – S1/h
6. 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
Explanation: equal to
7. 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
Explanation: h = (r1 – r2y/x
and stiffness of the spring, s = S2 – S1/h
8. Which of the following is a spring controlled governor?
a) Hartnell governor
b) Hartung governor
c) Wilson-Hartnell governor
d) All of the mentioned
Explanation: All of the mentioned
9. A pendulum type governor is a Watt governor.
a) True
b) False
Explanation: A Hartnell governor is a spring loaded governor.
Watt’s governor is a pendulum type governor.
10. A Porter governor is a
a) dead weight governor
b) pendulum type governor
c) spring loaded governor
d) inertia governor
Explanation: 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.