POWER SYSTEMS MCQS SET 05

POWER SYSTEMS MCQS SET 05

DISTRIBUTION SYSTEM OF ELECTRICAL POWER

1. What is the main type of distribution system in India?
a. Radial           b. Parallel            c. Network        d. Both (b) and (c)
ANSWER: a. Radial
 

2. Which component connects the substation to the area where power is to be distributed?
a. Distributors        b. Service mains      c. Feeders      d. All of these
ANSWER: c. Feeders
 

3. The cost of material used in a distribution circuit per kVA of the distributed power varies as
a. Square of linear dimensions of supply area.
b. Directly according to (supply area)2
c. Cube of linear dimensions of supply area.
d. None of these
ANSWER: b. Directly according to (supply area)2
 

4. Name the cable which connects the distributor to the consumer terminals.
a. Distributors        b. Service mains         c. Feeders       d. All
ANSWER: b. Service mains
 

5. What is the permissible limit of voltage variations allowed in the distribution systems?
a. ± 2 %          b. ± 5 %           c. ± 10 %            d. ± 6 %
ANSWER: d. ± 6 %
 

6. 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.
 

7. 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.
 

8. 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
 

9. 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
 

10. 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