Which of the following statements is a characteristic of a control transformer?

Question

Which of the following statements is a characteristic of a control transformer? Permits switching off the load. Prevents motor overload. Provides control voltage compatible with relay coils. Enables motor phase reversal. Which contactor utilization category permits plugging operation? AC-1 AC-2 AC-3 AC-4 What happens as power returns, in a three-wire motor circuit, following a power failure? The motor restarts automatically. The motor remains de-energized. The motor starts in the opposite direction. The overload relay trips. What should be taken care of. when servicing a two-wire control circuit? There is a risk of seeing the motor start inadvertently. Three wires must be connected to the pilot device. An operator must be present to restart the machine. All of the answers above are correct.

Explanation / Answer

Answer (c) provides voltage regulation compatible with relay coils

Control transformer is an isolation transformer in which increasing secondary voltage stability during small periods of overload condition gives decent voltage regulation by maximizing the inrush capability and output voltage regulation especially in electromagnetic devices like solenoids and relays used in industrial application.

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