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Machine Dynamics Practice Test: Governors
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Avg score: 71% Most missed: “For a stable governor, if the equilibrium speed increases, the radius of governo…”
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. 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.
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. If the mass of the ball is 7.5 kg and the controlling force is 200N with an angular velocity of 100 rpm, find the radius.
4. The sensitivity of a governor is 0, and the mean speed is 25 rpm, then it is not possible that the governor will be ________
5. When a governor is fitted into an engine, then sensitiveness is defined as the ratio of ________ of maximum and minimum speed to the mean speed.
6. In a governor, if the equilibrium speed is constant for all radii of rotation of balls, the governor is said to be
7. A governor is said to be isochronous when the equilibrium speed is
8. Controlling force is in the same direction as centrifugal force.
9. In a Porter governor, the balls are attached to the extension of lower links.
10. 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
11. In a spring controlled governor, when the controlling force _____________ as the radius of rotation increases, it is said to be a stable governor.
12. A very sensitive governor will cause hunting.
13. For a given fraction of change in speed, a more sensitive governor will have a ______
14. A Watt’s governor can work satisfactorily at speeds from
15. The power of a Porter governor is equal to
16. The effort of a Porter governor is equal to
17. A centrifugal Watt governor is fitted with two balls, each of mass 2.5 kg. Find the height of the governor, when it is running at 75 r.p.m.
18. The weights move inwards and the springs bend as they rotate about the spindle axis with increasing speed.
19. The power of a governor is the work done at
20. The height of a Watt’s governor is equal to
21. A Pickering governor is driving a gramophone. Each disc attached to the centre of a leaf spring has a mass of 20 g. The width of each spring is 5 mm and thickness of 0.125 mm. The effective length of each spring is 40 mm. The distance from the spindle axis to the centre of gravity of the mass when the governor is at rest, is 10 mm, find the speed of the turntable in rpm if ratio of the governor speed to the turntable speed is 10.5.
22. The sensitiveness of a governor is given by
23. In case of pickering governor, the central load is_______
24. The power of a governor is the work done at
25. A governor is said to be stable, if the