A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of core
Month: June 2018
A. 50°C
B. 80°C
C. 100°C
D. 150°C
A. 6400 W
B. 1600 W
C. 800 W
D. 400 W
A Buchholz relay can be installed on
A. auto-transformers
B. air-cooled transformers
C. welding transformers
D. oil cooled transformers
A. sludge
B. odour
C. gases
D. moisture
A. copper core
B. cost iron core
C. air core
D. mild steel core
A. zero
B. 1 ohm
C. 1000 ohms
D. infinite
A. increased core losses
B. increased I2R losses
C. magnetic interference with communication circuits
D. all of the above
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
A. to project against’internal fault
B. to reduce copper as well as core losses
C. to cool the transformer oil
D. to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
