A. Horn gaps
B. Thermal overload relays
C. Breather
D. Conservator
Transformers
Transformers
A good voltage regulation of a transformer means
A. output voltage fluctuation from no load to full load is least
B. output voltage fluctuation with power factor is least
C. difference between primary and secondary voltage is least
D. difference between primary and secondary voltage is maximum
A. Overfluxing protection
B. Buchholz relay
C. Overcurrent protection
D. All of the above
A. 0.8 leading power factor
B. 0.8 lagging power factor
C. zero power factor
D. unity power factor
A. voltage
B. current
C. current and voltage
D. power
A. on full-load
B. on overload
C. on leading power factor
D. on zero power factor
A. zero
B. 10 Q
C. 1000 Q
D. infinity
A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the above
A. high eddy current losses
B. reduced magnetic leakage
C. negligibly hysteresis losses
D. none of the above
A. 1.5 MVA
B. 5 MVA
C. 15 MVA
D. 50 MVA
