A. to provide free passage to the cooling oil
B. to insulate the coils from each other
C. both A. and (b)
D. none of the above
Related Mcqs:
- Helical coils can be used on___________?
A. low voltage side of high kVA transformers
B. high frequency transformers
C. high voltage side of small capacity transformers
D. high voltage side of high kVA rating transformers - Helical coils can be used on___________________?
A. low voltage side of high kVA transformers
B. high frequency transformers
C. high voltage side of small capacity transformers
D. high voltage side of high kVA rating transformers - In a transformer the tappings are generally provided on_____________?
A. primary side
B. secondary side
C. low voltage side
D. high voltage side - Which of the following protection is normally not provided on small distribution transformers ?
A. Overfluxing protection
B. Buchholz relay
C. Overcurrent protection
D. All of the above - In a transformer the resistance between its primary and secondary is____________?
A. zero
B. 1 ohm
C. 1000 ohms
D. infinite - In a transformer the resistance between its primary and secondary should be_____________?
A. zero
B. 10 Q
C. 1000 Q
D. infinity - No-load current in a transformer________________?
A. lags behind the voltage by about 75°
B. leads the voltage by about 75°
C. lags behind the voltage by about 15°
D. leads the voltage by about 15° - Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?
A. Bmax
B. Bmax1-6
C. Bmax1-83
D. B max - Buchholz’s relay gives warning and protection against_________________?
A. electrical fault inside the transformer itself
B. electrical fault outside the transformer in outgoing feeder
C. for both outside and inside faults
D. none of the above - During open circuit test of a transformer:
A. primary is supplied rated voltage
B. primary is supplied full-load current
C. primary is supplied current at reduced voltage
D. primary is supplied rated kVA
