Transformers

A. Core insulation voltage test
B. Impedance test
C. Radio interference test
D. Polarity test

A. leading power factor
B. lagging power factor
C. unity power factor
D. zero power factor

A. copper loss = iron loss
B. copper loss iron loss
D. none of the above

A. special test
B. routine test
C. type test
D. none of the above

A. value of transformation ratio remains constant
B. permeability of transformer core remains constant
C. core flux remains practically constant
D. primary voltage remains constant
C. secondary voltage remains constant

A. high reluctance
B. low reactance
C. high resistance
D. low resistance

A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increased

A. Low hysteresis loss
B. High permeability
C. High thermal conductivity
D. Adequate mechanical strength

A. load current
B. load current and voltage
C. load current, voltage and frequency
D. load current, voltage, frequency and power factor

A. no losses and magnetic leakage
B. interleaved primary and secondary windings
C. a common core for its primary and secondary windings
D. core of stainless steel and winding of pure copper metal
E. none of the above