A Buchholz relay can be installed on
A. auto-transformers
B. air-cooled transformers
C. welding transformers
D. oil cooled transformers
Related Mcqs:
- 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 - Sumpner’s test is conducted on transformers to determine_____________?
A. temperature
B. stray losses
C. all-day efficiency
D. none of the above - 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° - In a transformer routine efficiency depends upon_____________?
A. supply frequency
B. load current
C. power factor of load
D. both B. and (c) - In a transformer the tappings are generally provided on_____________?
A. primary side
B. secondary side
C. low voltage side
D. high voltage side - If the percentage impedances of the two transformers working in parallel are different, then______________________?
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load - Harmonics in transformer result in___________?
A. increased core losses
B. increased I2R losses
C. magnetic interference with communication circuits
D. all of the above - If a transformer is continuously operated the maximum temperature rise will occur in_______________?
A. core
B. windings
C. tank
D. any 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 - The size of a transformer core will depend on__________?
A. frequency
B. area of the core
C. flux density of the core material
D. A. and B. both
