A. Phase quantities are separated by 120 electrical degrees.B. Total instantaneous power can be constant.C. Neutral current is zero in a balanced four-wire star load.D. All line voltages are in phase.
A. Input and output frequencies are equal.B. Voltage ratio equals turns ratio.C. It operates on steady DC without transients.D. Input power equals output power.
Correct Answer: A|B|D
Explanation:
An ideal transformer needs changing flux and conserves power.
A. Inductive and capacitive reactances are equal.B. The impedance is purely resistive.C. Current magnitude is maximum for fixed source voltage.D. Power factor is zero.
