The transformer lamination’s are insulated from each other by____________?
The transformer lamination’s are insulated from each other by____________?
A. mica strip
B. thin coat of varnish
C. paper
D. any of the above
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No-load current of a transformer has_____________?
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 factorN atural air coo ling is generally restricted for transformers up to__________?
N atural air coo ling is generally restricted for transformers up to__________?
A. 1.5 MVA
B. 5 MVA
C. 15 MVA
D. 50 MVAWhich of the following loss in a transformer is zero even at full load ____________?
Which of the following loss in a transformer is zero even at full load ____________?
A. Core loss
B. Friction loss
C. Eddy current loss
D. Hysteresis lossA Buchholz relay can be installed on______________?
A Buchholz relay can be installed on______________?
A Buchholz relay can be installed on
A. auto-transformers
B. air-cooled transformers
C. welding transformers
D. oil cooled transformersThe main reason for generation of harmonics in a transformer could be_______________?
The main reason for generation of harmonics in a transformer could be_______________?
A. fluctuating load
B. poor insulation
C. mechanical vibrations
D. saturation of coreNo-load current in a transformer________________?
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°