# DC Distribution of Electrical Power - MCQs with Answers

## DC Distribution of Electrical Power - MCQs with Answers

Q1. Where the radial systems are generally employed?

a. Where power is generated at low voltage.
b. Where power is generated at high voltage.
c. Where power is generated at low voltage and substation is located at the centre of the load.
d. Where power is generated at high voltage and substation is located at the centre of the load.

ANSWER: c. Where power is generated at low voltage and substation is located at the centre of the load.

Q2. What is the main advantage of ring main system over radial system?

i. Voltage drop in the feeder is less.
ii. Power factor is higher.
iii. Supply is more reliable.

Which among the above statements are correct?

a. i and ii only.
b. ii and iii only.
c. i and iii only.
d. i, ii and iii.

ANSWER: c. i and iii only.

Q3. Where the null point of a uniformly loaded distributor feed at equal voltage at both ends lies at?

a. Mid point
b. Either end
c. Two third distance from one end
d. One fourth distance from one end

ANSWER: a. Mid point

Q4. In a distribution system, which of the following items shares the major cost?

a. Conductors
b. Earthing systems
c. Distribution transformer
d. Insulators

ANSWER: c. Distribution transformer

Q5. Which type of distribution is preferred in residential areas?

a. Single phase, two wire.
b. Three phase, three wire
c. Three phase, four wire
d. Two phase, four wire

ANSWER: c. Three phase, four wire

Q6. In a dc 3 wire distributor using having unequal loads on the two sides

a. Both balancers operate as generators.
b. Both balancers operate as motors.
c. Balancers connected to the lightly loaded sides operate as a generator.
d. Balancers connected to the heavily loaded sides operate as a generator.

ANSWER: d. Balancers connected to the heavily loaded sides operate as a generator.

Q7. Why are the balancers fields cross connected in a three wire distribution system?

a. Equalise voltage on positive and negative outer
b. Boost the generated voltage.
c. Make both machines operate as unloaded motors.
d. All of these.

ANSWER: a. Equalise voltage on positive and negative outer

Q8. Which distribution system is energised by two or more generating stations or substations?

b. Interconnected systems.
c. Ring main systems.
d. All of these.

ANSWER: b. Interconnected systems.

Q9. A three wire dc distribution makes available how many voltages?

a. One
b. Two
c. Three
d. Both (a) and (b)

Q10. If the voltage of the system is about 230 V, then what would be the highest and the lowest permissible voltage?

a. 242 and 214 V
b. 240 and 210 V
c. 244 and 216 V
d. 244 and 212 V