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1) What is the per unit system (PU)? a. A ratio of actual value in any units to the base or reference value in the same units b. A ratio of the base or reference value in any units to the actual value in the same units. c. Ratio of the square of the actual value in any units to the square of base or the reference value in the same units d. All of these
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2) What is the simplified diagram called, after omitting all resistances, static loads, capacitance of the transmission lines and magnetising circuit of the transformer? a. Single line diagram b. Resistance diagram c. Reactance diagram d. Both (a) and (b) e. None of these
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3) What will be the per unit impedance of a synchronous motor having a rating of 100 kVA, 13.2 kV and having a reactance of 75 Ω / ph? a. 0.043 pu b. 0.057 pu c. 0.036 pu d. 0.298 pu
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4) Which among these is the major advantage of per unit computations? a. Per unit impedance of transformers is the same referred to either side of it. b. For simulating steady state and transient models in the computer this method is very useful. c. Manufactures usually specify the impedance of an apparatus in per unit system. d. All of these
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5) What is infinite bus in power system? a. A large system with infinite voltage b. A large system in which the voltage and frequency varies c. A large system whose voltage and frequency remains constant throughout. d. Both (a) and (b) e. None of these
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6) Which among the following assumptions are made in the reactance diagram? a. The neutral reactance are neglected b. Static loads are neglected. c. The capacitance of the transmission lines are neglected d. Only a and c e. All of these
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7) Which of the following fault results into a three phase faults? a. Single line to ground fault. b. Double line to ground fault c. Line to line fault d. Fault due to all the three phases to earth.
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8) Which among these is the most commonly occurring fault? a. Single line to ground fault. b. Double line to ground fault c. Line to line fault d. Fault due to all the three phases to earth.
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9) In which portion of the transmission system is the occurrence of the fault more common? a. Alternators b. Transformers c. Transmission lines d. Underground cables
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10) Which among these is the most severe fault? a. Single line to ground fault. b. Double line to ground fault c. Line to line fault d. Symmetrical fault.
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