Electrical Distribution System MCQ

21. The main criterion for the design of a distributor is

1. voltage drop
2. corona loss
3. temperature rise
4. all options are correct

22. In a transmission system, the feeder supplies power to _____

1. transformer substations
2. service mains
3. distributors
4. All options are correct

23. The main criterion for the design of a distributor is:

1. Voltage drop
2. Corona loss
3. Temperature rise
4. Radio interference

24. Transmission lines and distribution lines can be discriminated by

1. the size of the conductor
2. the operating voltage
3. The amount of current carried by the liner
4. None of these

25. How much is the cross-section area of the neutral wire in a 3 phase 4 wire system?

1. the same cross-section as the outer wires
2. half the cross-section as the outer wires
3. twice the cross-section as the outer wires
4. 0.75 times the cross-section of the line

26. In a distribution system, major cost is that of

1. Earthing system
2. Distribution transformer
3. Conductors
4. Meters

27. All transmission and distribution systems are _______ phase systems.

1. 3
2. 2
3. 1
4. 4

28. Which of the following is most commonly used in secondary distribution?

1. 2-phase 3-wire
2. 1-phase 2-wire
3. 1-phase 3-wire
4. 3-phase 4-wire

29. For secondary distribution, the transformer(s) used is/are

1. Auto Transformer
2. Star-Delta and Delta-Star Transformer both
3. Star-Delta Power Transformer
4. Delta-Star Distribution Transformer

30. Which one of the following is a major consideration in the design of a distributor?

1. Supply voltage
2. Current rating
3. Voltage drop
4. Frequency