1) A synchronous motor takes the leading current when it is
a. Overexcited
b. Under excited
c. Not excited
d. Either (a) or (b)
e. All of these
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Answer
Explanation
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ANSWER: Either (a) or (b)
Explanation:
No explanation is available for this question!
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2) For voltage boosting in distribution networks the capacitors used is
a. Series capacitors
b. Shunt capacitors
c. Both (a) and (b)
d. None of these
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Answer
Explanation
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ANSWER: Series capacitors
Explanation:
No explanation is available for this question!
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3) To reduce the power consumption, the capacitors should be located
a. As close as possible to the load
b. As far as possible to the load
c. Not too close not too far from the load
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: As close as possible to the load
Explanation:
No explanation is available for this question!
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4) If an alternator is supplying load of 350 kW at 0.6 pf lagging and its power factor is raised to unity then to supply the alternator for the same kVA loading, the extra required kilowatts will be
a. 205 kW
b. 212 kW
c. 233 kW
d. 246 kW
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Answer
Explanation
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ANSWER: 233 kW
Explanation:
No explanation is available for this question!
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5) In order to improve the power factor of equipment operating at lagging power factor, a capacitor is connected
a. In series with the equipment
b. In parallel with the equipment
c. In series-parallel with the equipment
d. Either (a) or (b)
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Answer
Explanation
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ANSWER: In parallel with the equipment
Explanation:
No explanation is available for this question!
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6) Phase advancers are used to improve the power factor of
a. Induction motors
b. Induction generators
c. Synchronous motors
d. Synchronous generators
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Answer
Explanation
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ANSWER: Induction motors
Explanation:
No explanation is available for this question!
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7) Power factor of a load can be improved by using
a. Static capacitors
b. Synchronous condenser
c. Phase advancer
d. Only a and b
e. All of the above
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Answer
Explanation
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ANSWER: All of the above
Explanation:
No explanation is available for this question!
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8) If power factor is less than unity then it will result in
a. Large kVA rating of equipment
b. Greater conductor size
c. Large copper losses
d. Only A and C
e. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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9) If the load current decreases then the power factor
a. Will also decrease
b. Will increase
c. Will remains unchanged
d. None of these
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Answer
Explanation
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ANSWER: Will increase
Explanation:
No explanation is available for this question!
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10) The wattles component is
a. I
b. I cos∅
c. I sin∅
d. None of these
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Answer
Explanation
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ANSWER: I sin∅
Explanation:
No explanation is available for this question!
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