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Consider the following statements: 1. In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine. 2. Hunting occurs when the governor is not sensitive. 3. Isochronous governors have the same speed over a wide range of governor action. 4. A governor is said to be unstable if the radius of rotation falls as the speed increases. Which of the above statements are correct?

Consider the following statements: 1. In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine. 2. Hunting occurs when the governor is not sensitive. 3. Isochronous governors have the same speed over a wide range of governor action. 4. A governor is said to be unstable if the radius of rotation falls as the speed increases. Which of the above statements are correct? Correct Answer 1, 3 and 4 only

Concept:

  • A governor is said to be isochronous when the equilibrium speed is constant (i.e. range of speed is zero) for all radii of rotation of the balls within the working range, neglecting friction. The isochronism is the stage of infinite sensitivity.
  • A governor is said to be hunt if the speed of the engine fluctuates continuously above and below the mean speed. The very very fast to and fro motion of the sleeve between the stoppers is known as hunting and it occurs when the governor is too sensitive,
  • As in isochronous governor, equilibrium speed is constant, so it will not vibrate and thus hunting is zero for isochronous governor.
  • In stationary constant speed engines, the spring-loaded governor mechanism is fitted on the cam-shaft of the engine.
  • Stable Governor: A governor is said to be stable when for every speed within the working range there is a definite configuration, i.e. there is only one radius of rotation of the governor balls at which the governor is in equilibrium. For a stable governor, if the equilibrium speed increases, the radius of governor balls must also increase.
  • A governor is said to be unstable, if the radius of rotation decreases as the speed increases.

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