1. The main function of an electrical distribution system is to:
(A) Generate electrical power
(B) Transmit power at high voltage
(C) Distribute electrical power to consumers at utilization voltage
(D) Convert AC to DC
2. The distribution system generally operates at:
(A) Extra high voltage
(B) High voltage
(C) Medium and low voltage
(D) Direct current
3. The simplest type of distribution system is:
(A) Interconnected system
(B) Ring main system
(C) Radial system
(D) Grid system
4. In a radial distribution system, power flows:
(A) In one direction only
(B) In two directions
(C) In all directions
(D) Through transformers only
5. The main disadvantage of a radial distribution system is:
(A) High initial cost
(B) Poor reliability
(C) Complex operation
(D) High maintenance
6. The ring main distribution system provides:
(A) Single path for current
(B) Two alternative paths for current
(C) No alternative path
(D) High voltage transmission
7. In a ring main system, if one section fails:
(A) The entire system fails
(B) Supply continues from the other side
(C) Load is completely disconnected
(D) Voltage becomes zero
8. The interconnected distribution system improves:
(A) Voltage regulation and reliability
(B) Transmission losses
(C) Power factor only
(D) Resistance of conductors
9. Interconnected distribution systems are mostly used in:
(A) Rural areas
(B) Urban areas
(C) Remote villages
(D) Temporary installations
10. The voltage drop in a radial system is:
(A) Uniform throughout
(B) Maximum at the farthest end
(C) Minimum at the farthest end
(D) Zero at all points
11. In a ring main system, the voltage drop at the farthest point is:
(A) More than in radial system
(B) Less than in radial system
(C) Same as radial system
(D) Always zero
12. The reliability of power supply is highest in:
(A) Radial system
(B) Ring main system
(C) Interconnected system
(D) None of these
13. In a radial system, when the load increases, the voltage:
(A) Increases
(B) Decreases
(C) Remains constant
(D) Becomes zero
14. The main advantage of a ring main distribution system is:
(A) Simplicity
(B) Low cost
(C) Reliability and voltage regulation
(D) High losses
15. The most economical system for a small town or rural area is:
(A) Radial system
(B) Ring system
(C) Interconnected system
(D) Underground system
16. The most suitable distribution system for densely populated urban areas is:
(A) Radial system
(B) Interconnected system
(C) Overhead DC system
(D) Isolated system
17. The ring main system requires:
(A) Fewer conductors than radial
(B) More conductors than radial
(C) Same number of conductors as radial
(D) None of these
18. The maintenance cost of an interconnected system is generally:
(A) Higher
(B) Lower
(C) Same as radial
(D) Zero
19. In case of a fault in a ring main system:
(A) The system shuts down completely
(B) The faulted section can be isolated
(C) All consumers lose supply
(D) None of these
20. The main drawback of a radial distribution system is:
(A) High voltage drop
(B) High efficiency
(C) Low initial cost
(D) Easy fault detection
21. The voltage at the farthest end of a radial system is:
(A) Same as at the sending end
(B) Slightly higher
(C) Lower
(D) Depends on power factor only
22. Which distribution system requires the largest conductor size for the same load?
(A) Interconnected
(B) Ring main
(C) Radial
(D) Grid
23. The reliability of the ring main system is:
(A) Poor
(B) Moderate
(C) Better than radial
(D) Same as radial
24. The cost of an interconnected distribution system is:
(A) Highest among all types
(B) Lowest among all types
(C) Same as ring system
(D) Negligible
25. In radial systems, fault isolation is:
(A) Easy and quick
(B) Difficult and time-consuming
(C) Automatic
(D) Not required
26. The interconnected system is also known as:
(A) Network system
(B) Series system
(C) Parallel system
(D) Central system
27. The major advantage of an interconnected system is:
(A) Power sharing between substations during peak load
(B) Simplicity of operation
(C) Fewer switches
(D) Smaller conductor size
28. The voltage regulation of an interconnected system is:
(A) Poor
(B) Best among all systems
(C) Same as ring main
(D) Variable
29. In a ring main system, if load on one feeder increases, the voltage drop:
(A) Increases slightly
(B) Remains constant
(C) Decreases
(D) Becomes zero
30. Which system ensures continuous supply even during maintenance?
(A) Radial system
(B) Ring main system
(C) Interconnected system
(D) Both (B) and (C)