Which of the following statement is incorrecta)At constant speed and equilibrium condition, the resultant force acting on the sleeve of governor is zero.b)In punching press to reduce the variation of speed governor is used.c)Governor used in gramophone is Pickering governor.d)For an isochronous governor, the range of speed in on-load condition is zero.Correct answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:

Governor is a device used to control the speed of an engine or machine by regulating the amount of fuel or working fluid admitted to the system. Let's analyze each statement to determine which one is incorrect.

a) At constant speed and equilibrium condition, the resultant force acting on the sleeve of governor is zero:
In a governor, the sleeve moves up and down based on the centrifugal force generated by the balls or weights attached to it. When the governor reaches a constant speed and equilibrium condition, the centrifugal force acting on the balls or weights is balanced by the opposing force, which is primarily the force due to gravity acting on the sleeve. Therefore, the resultant force acting on the sleeve is indeed zero at this condition. This statement is correct.

b) In punching press to reduce the variation of speed governor is used:
This statement is incorrect. In a punching press, a governor is not used to reduce the variation of speed. Instead, a flywheel is typically used to maintain a constant speed during the punching operation. The flywheel stores kinetic energy and releases it when the load on the press increases, helping to maintain a consistent speed. Therefore, the use of a governor in a punching press is not common, making this statement incorrect.

c) Governor used in gramophone is Pickering governor:
The governor used in a gramophone is not the Pickering governor. The Pickering governor is a type of centrifugal governor used in steam engines. In a gramophone, a different type of governor known as a centrifugal speed regulator is used. This governor helps to maintain a constant rotational speed of the turntable, ensuring that the recorded sound plays back at the correct pitch. Therefore, this statement is incorrect.

d) For an isochronous governor, the range of speed in on-load condition is zero:
An isochronous governor is designed to maintain a constant speed regardless of the load applied. It achieves this by adjusting the fuel or working fluid flow to compensate for changes in the load. In an on-load condition, the isochronous governor operates within a certain speed range to maintain the desired speed. Therefore, the range of speed in the on-load condition is not zero for an isochronous governor. This statement is incorrect.

Conclusion:
Based on the analysis of each statement, it is clear that the incorrect statement is option 'B' - 'In punching press to reduce the variation of speed governor is used.'

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