A transformer will have zero efficiency at Half full load None of the listed here No load Full load TRUE ANSWER : ? YOUR ANSWER : ?
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is less than one great than one None of these approximately equal to one TRUE ANSWER : ? YOUR ANSWER : ?
The noise produced by a transformer is termed as buzz ringing hum zoom TRUE ANSWER : ? YOUR ANSWER : ?
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____. 100 W 200 W 400 W None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
The path of the magnetic flux in transformer should have high reluctance low resistance low reactance high resistance TRUE ANSWER : ? YOUR ANSWER : ?
The open circuit test on a transformer is always made on ______ Either low or high voltage winding Low voltage winding None of the listed here High voltage winding TRUE ANSWER : ? YOUR ANSWER : ?
The flux in the core of a single phase transformer is _____ Partly alternating and partly rotating Purely rotating one Purely alternating one None of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Losses which occur in rotating electric machines and do not occur in trans formers are magnetic losses friction and windage losses hysteresis and eddy current losses copper losses TRUE ANSWER : ? YOUR ANSWER : ?
The dielectric strength of transformer oil is expected to be 33 kV 330 kV lkV 100 kV TRUE ANSWER : ? YOUR ANSWER : ?
A Buchholz relay can be installed on Welding transformer Oil cooled transformer Auto transformer Air-cooled transformer TRUE ANSWER : ? YOUR ANSWER : ?