A. load is unbalanced only
B. load is balanced only
C. on balanced as well as unbalanced loads
D. none of the above
Related Mcqs:
- Delta/star transformer works satisfactorily when______________?
A. load is balanced only
B. load is unbalanced only
C. on balanced as well as unbalanced loads
D. none of the above - Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in____________?
A. short-circuiting of the secondaries
B. power factor of one of the transformers is leading while that of the other lagging
C. transformers having higher copper losses will have negligible core losses
D. loading of the transformers not in proportion to their kVA ratings - Natural oil cooling is used for transformers up to a rating of____________?
A. 3000 kVA
B. 1000 kVA
C. 500 kVA
D. 250 kVA - Two transformers operating in parallel will share the load depending upon their____________?
A. leakage reactance
B. per unit impedance
C. efficiencies
D. ratings - Open circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses - Short circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses - For the parallel operation of single phase transformers it is necessary that they should have___________?
A. same efficiency
B. same polarity
C. same kVA rating
D. same number of turns on the secondary side. - The secondary winding of which of the following transformers is always kept closed?
A. Step-up transformer
B. Step-down transformer
C. Potential transformer
D. Current transformer - 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 above - Losses which occur in rotating electric machines and do not occur in transformers are___________?
A. friction and windage losses
B. magnetic losses
C. hysteresis and eddy current losses
D. copper losses
