A. 180°
B. 120″
C. 90°
D. 75°
Transformers
Transformers
A. natural air cooling
B. air blast cooling
C. oil cooling
D. any of the above
A. friction and windage losses
B. copper losses
C. hysteresis and eddy current losses
D. none of the above
A. 100 per cent
B. 98 per cent
C. 50 per cent
D. 25 per cent
A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding
A. is always a low voltage winding
B. is always a high voltage winding
C. could either be a low voltage or high voltage winding
D. none of the above
A. there is no need to change the D.C. voltage
B. a D.C. circuit has more losses
C. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
D. none of the above
A. voltage
B. current
C. power
D. frequency
A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding
A. High voltage side
B. Low voltage side
C. Primary side
D. Secondary side
