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Machine Dynamics Practice Test: Governors
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Governors topics include: Governors and its types, watt and porter governor, hartnell, hartung and pickering governors, stability of governors, power of governor and porter governor, controlling force, controlling force diagram for porter and spring-controlled governor. A machine governor is a device that regulates the speed of a machine, such as an engine. Governors can also be used to limit the top speed of vehicles and protect engines from damage due to excessive rotational speed.  Governors typically regulate engine speed by varying the rate at which fuel is supplied. Most governors use... Show more
Machine Dynamics Practice Test: Governors
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25 Questions

1. Control force diagram enables to examine stability and sensitivity of the governor.
2. A Porter governor has equal arms each of length 250 mm and pivoted on the axis of rotation. Each ball has a mass of 5 kg and the central load has a mass on the sleeve of 25 kg. The radius of rotation of the ball is 150 mm when the governor begins to lift and 200 mm when the governor is at maximum speed. Neglecting friction at the sleeve, find the governor effort.
3. A pendulum type governor is a Watt governor.
4. Controlling force in the porter governors is due to which of the following components?
5. For a governor, the sensitivity is 0.5 and the mean speed is 20 rpm, find the maximum speed.
6. A Porter governor can not be isochronous.
7. The sensitivity of a governor is 0, and the mean speed is 25 rpm, then it is not possible that the governor will be ________
8. For a porter governor, Each arm has a length of 250mm and pivoted on the axis of rotation. Sleeves carry a mass of 25kg and each ball’s mass is 5Kg. Radius of rotation: 150mm at the beginning of lift and 200mm at the maximum speed of governor. Find range in speed neglecting friction in rpm.
9. In a Hartnell governor, the stiffness of the spring is given by
10. A Porter governor has equal arms each of length 250 mm and pivoted on the axis of rotation. Each ball has a mass of 5 kg and the central load has a mass on the sleeve of 25 kg. The radius of rotation of the ball is 150 mm when the governor begins to lift and 200 mm when the governor is at maximum speed. Neglecting friction at the sleeve, find the sleeve lift.
11. For a given lift of the sleeve, the sensitiveness of the governor increases as the speed range decreases
12. For isochronism, range of speed should be equal to mean speed.
13. When the governor is too sensitive, then which of the following process occurs?
14. The effort of a Porter governor is equal to
15. Power of a governor depends on which of the following factor?
16. The relation between the controlling force (Fc) and radius of rotation (r) for a stable spring controlled governor is
17. If the sleeve lift is 80 mm and Power generated by the governor is 6 N-m, then find the mean effort.
18. For isochronous Hartnell governor
19. On which of the following factors, the stability of governor does not depend?
20. For a given fraction of change in speed, a more sensitive governor will have a ______
21. For driving a gramophone, which of the following governor is used?
22. If the mass of the ball is 25 kg and the controlling force is 450 N with an angular velocity of 150 rpm, find the radius.
23. A governor is said to be isochronous when range of speed is zero for all radii of rotation of the balls within the working range, neglecting friction.
24. A Porter governor has equal arms each of length 250 mm and pivoted on the axis of rotation. Each ball has a mass of 5 kg and the central load has a mass on the sleeve of 25 kg. The radius of rotation of the ball is 150 mm when the governor begins to lift and 200 mm when the governor is at maximum speed. Considering friction at the sleeve of 10N, find the governor effort.
25. In a Hartnell governor, the lift of the sleeve is given by