The transformer oil should have _______ volatility and _______ viscosity?
The transformer oil should have _______ volatility and _______ viscosity?
A. low,low
B. high,high
C. low,high
D. high,low
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Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?
A. approximately equal to one
B. less than one
C. great than one
D. none of the aboveWhich winding of the transformer has less cross-sectional area?
Which winding of the transformer has less cross-sectional area?
A. Primary winding
B. Secondary winding
C. Low voltage winding
D. High voltage windingWhich of the following protection is normally not provided on small distribution transformers ?
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 aboveThe leakage flux in a transformer depends upon______________?
The leakage flux in a transformer depends upon______________?
A. load current
B. load current and voltage
C. load current, voltage and frequency
D. load current, voltage, frequency and power factorStar/star transformers work satisfactorily when________________?
Star/star transformers work satisfactorily when________________?
A. load is unbalanced only
B. load is balanced only
C. on balanced as well as unbalanced loads
D. none of the aboveIn a transformer routine efficiency depends upon_____________?
In a transformer routine efficiency depends upon_____________?
A. supply frequency
B. load current
C. power factor of load
D. both B. and (c)