AC distribution of Electrical Power - MCQs with Answers

AC distribution of Electrical Power - MCQs with Answers

Q1. For purely domestic loads which type of distribution is employed?

a. Single phase two wire.
b. 3 phase 3 wire
c. 3 phase 4 wire
d. None of these

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Q2. Which type of loads use 3 phase 4 wire ac system of distribution?

a. Balanced
b. Unbalanced
c. Both (a) and (b)
d. None of these.

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Q3. In a balanced 3 phase, 4 wire ac system the phase sequence is RYB. If the voltage of R phase = 230 ∠ 0° volts, then what will be the B phase?

a. 230 ∠ - 120°
b. 230 ∠ - 90°
c. 230 ∠ - 90°
d. 230 ∠ - 120°

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Q4. What are ground detectors?

a. Used for detecting earth faults for all cables.
b. Used for detecting ground faults for underground cables.
c. Used for detecting all types of fault in a underground cables.
d. None of these.

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Q5. A single phase AC distributor supplies two single phase loads as shown. What is the voltage drop from A to C?



a. 4.5 V
b. 30 V
c. 31.5 V
d. 20 V

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Q6. An industrial consumer has a load pattern of 2000 kW, 0.8 lag for 12 hours and 1000 kW UPF for 12 hours. What is its load factor?

a. 10.5
b. 0.75
c. 0.6
d. 2.0

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