Distribution transformers are generally designed for maximum efficiency around________________?
Distribution transformers are generally designed for maximum efficiency around________________?
A. 90% load
B. zero load
C. 25% load
D. 50% load
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Star/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 aboveIf a transformer is continuously operated the maximum temperature rise will occur in_______________?
If a transformer is continuously operated the maximum temperature rise will occur in_______________?
A. core
B. windings
C. tank
D. any of the aboveThe secondary of a current transformer is always short-circuited under operating conditions because it____________________?
The secondary of a current transformer is always short-circuited under operating conditions because it____________________?
A. avoids core saturation and high voltage induction
B. is safe to human beings
C. protects the primary circuit
D. none of the aboveA 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 transformersDuring open circuit test of a transformer:
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 kVAWhich of the following properties is not necessarily desirable for the material for transformer core ?
Which of the following properties is not necessarily desirable for the material for transformer core ?
A. Low hysteresis loss
B. High permeability
C. High thermal conductivity
D. Adequate mechanical strength