A. same efficiency
B. same polarity
C. same kVA rating
D. same number of turns on the secondary side.
Related Mcqs:
- 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 - What will happen if the transformers working in parallel are not connected with regard to polarity ?
A. The power factor of the two trans-formers will be different from the power factor of common load
B. Incorrect polarity will result in dead short circuit
C. The transformers will not share load in proportion to their kVA ratings
D. none of the above - Two transformers operating in parallel will share the load depending upon their____________?
A. leakage reactance
B. per unit impedance
C. efficiencies
D. ratings - If the percentage impedances of the two transformers working in parallel are different, then______________________?
A. transformers will be overheated
B. power factors of both the transformers will be same
C. parallel operation will be not possible
D. parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load - Which of the following statements regarding an idel single-phase transformer having a turn ratio of 1 : 2 and drawing a current of 10 A from 200 V A.C. supply is incorrect?
A. Its secondary current is 5 A
B. Its secondary voltage is 400 V
C. Its rating is 2 kVA
D. Its secondary current is 20 A
E. It is a step-up transformer - Natural oil cooling is used for transformers up to a rating of____________?
A. 3000 kVA
B. 1000 kVA
C. 500 kVA
D. 250 kVA - 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 above - Open circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses - 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 - 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
