HVDC transformer insulation has to be:
A. wet always
B. dry always
C. no need of insulation
D. can be dry or wet
Transformers
Core flux in the transformer is:
A. sinusoidal
B. flat-topped
C. square wave
D. triangular
If 200 V is supplied at the main of a transformer with primary turns of 100 and secondary turns of 400, we will receive ____ ?
A. 800 V at secondary
B. 80 V at secondary
C. 3200 V at secondary
D. 1600 V at secondary
A short circuit test is carried out on a given 100 kVA, 220/6000-V transformer. Which rating is required currently ?
A. 60A
B. 30A
C. 445A
D. 40A