The efficiency of a transformer will be maximum when ______ Copper loss is equal to constant loss None of the listed here Resistance of the two winding are equal Leakage reactance of the two winding TRUE ANSWER : ? YOUR ANSWER : ?
Negative voltage regulation is indicative that the load is None of these inductive only inductive or resistive capacitive only TRUE ANSWER : ? YOUR ANSWER : ?
When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density cool as there is no secondary current hot because primary will carry heavy current none of above will happen TRUE ANSWER : ? YOUR ANSWER : ?
The primary and secondary of a transformer are ______ coupled. None of the listed here Electrically Magnetically Electrically and magnetically TRUE ANSWER : ? YOUR ANSWER : ?
Losses which occur in rotating electric machines and do not occur in trans formers are copper losses friction and windage losses hysteresis and eddy current losses magnetic losses TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a part of transformer installation? Exciter Conservator Buchholz relay Breather TRUE ANSWER : ? YOUR ANSWER : ?
A transformer has 200 W as iron loss at full load. The iron loss at full load. The iron loss at half full load will be 50 W 100 W 200 W 400 W TRUE ANSWER : ? YOUR ANSWER : ?
The power transformer is a constant Current device Power device Main flux device Voltage device TRUE ANSWER : ? YOUR ANSWER : ?
The open circuit test on a transformer is always made on ______ High voltage winding None of the listed here Low voltage winding Either low or high voltage winding TRUE ANSWER : ? YOUR ANSWER : ?
The power efficiency of a lightning transformer is always ______its all day efficiency. Less than Equal to None of the listed here Higher than TRUE ANSWER : ? YOUR ANSWER : ?