A. poor insulation
B. Overload
C. loose connections
D. Core saturation
Which of the following acts as a protection against high voltage surges due to lightning and switching ?
A. Horn gaps
B. Thermal overload relays
C. Breather
D. Conservator
An ideal transformer is one which has_____________?
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
Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
A. 50°C
B. 80°C
C. 100°C
D. 150°C
An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
A. true
B. false
No-load current of a transformer has_____________?
A. has high magnitude and low power factor
B. has high magnitude and high power factor
C. has small magnitude and high power factor
D. has small magnitude and low power factor
If a transformer is continuously operated the maximum temperature rise will occur in_______________?
A. core
B. windings
C. tank
D. any of the above