A control transformer has ___ input coils and ___ output coil.

A control transformer has ___ input coils and ___ output coil.

• A. One, one
• B. Two, one
• C. Three, two
• D. Two, two

Answer: (B)

Control transformers are designed with dual primary windings to handle different supply voltages, and a single secondary winding to provide the low control voltage for the control circuit. The two input coils can be wired in series for higher line voltage or in parallel for lower voltage, giving flexibility in how the transformer is connected to the power source. The output is typically one coil, delivering a single low voltage for devices like relays, contactors, or PLC inputs. So the configuration is two input coils and one output coil.

Control transformers are designed with dual primary windings to handle different supply voltages, and a single secondary winding to provide the low control voltage for the control circuit. The two input coils can be wired in series for higher line voltage or in parallel for lower voltage, giving flexibility in how the transformer is connected to the power source. The output is typically one coil, delivering a single low voltage for devices like relays, contactors, or PLC inputs. So the configuration is two input coils and one output coil.