Which of the following is a probable cause of relay-controlled equipment failing to start when the contactor is closed?

A. One contact not closing
B. Excessive residual magnetism
C. Gummy deposits
D. A grounded coil



Answer :

Final answer:

Gummy deposits, excessive residual magnetism, and grounded coil can all be causes of relay-controlled equipment failing to start.


Explanation:

Gummy deposits can be a probable cause of relay-controlled equipment failing to start when the contactor is closed. Gummy deposits can prevent proper contact between components, leading to malfunction. This can disrupt the flow of current and hinder the equipment's operation.

Excessive residual magnetism is another potential cause of such failure. If the residual magnetism is too high, it can interfere with the normal functioning of the relay, impacting its ability to start even when the contactor is closed.

A grounded coil could also be a culprit. If the coil is grounded, it can create a short circuit, disrupting the magnetic field necessary for the relay to operate correctly, thus preventing the equipment from starting.


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