Transmission And Distribution Multiple Choice Questions And Answers In English -01

Transmission And Distribution Multiple Choice Questions And Answers

1. Which of the following methods is used for laying of underground cables ?
(A) Direct laying
(B) Draw-in-system
(C) Solid system
(D) All of the above
Ans: D

2. Which of the following is the source of heat generation in the cables ?
(A) Dielectric losses in cable insulation
(B) losses in the conductor
(C) Losses in the metallic sheathings and armourings
(D) All of the above
Ans: D

3. The underground system cannot be operated above
(A) 440 V
(B) 11 kV
(C) 33 kV
(D) 66 kV
Ans: D

4. Which of the following faults is most likely to occur in cables ?
(A) Cross or short-circuit fault
(B) Open circuit fault
(C) Breakdown of cable insulation
(D) All of the above
Ans: D

5. The cause of damage to the lead sheath of a cable is
(A) crystallisation of the lead through vibration
(B) chemical action on the lead when buried in the earth
(C) mechanical damage
(D) all of the above
Ans: D

6. The distributors for residential areas are
(A) single phase
(B) three-phase three wire
(C) three-phase four wire
(D) none of the above
Ans: C

7. Overhead system can be designed for operation up to
(A) 11 kV
(B) 33 kV
(C) 66 kV
(D) 400 kV
Ans: C

8. The operating voltage of supertension cables is up to
(A) 3.3 kV
(B) 6.6 kV
(C) 11 kV
(D) 33 kV
Ans: D

9. The operating voltage of extra high tension cables is upto
(A) 6.6 kV
(B) 11 kV
(C) 33 kV
(D) 66 kV
(e) 132 kV
Ans: D

10. Which of the following D.C. distribution system is the simplest and lowest in first cost ?
(A) Radial system
(B) Ring system
(C) Inter-connected system
(D) None of the above
Ans: A

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11. A booster is a
(A) series wound generator
(B) shunt wound generator
(C) synchronous generator
(D) none of the above
Ans: A

12. Which of the following materials is not used for transmission and distribution of electrical power ?
(A) Copper
(B) Aluminium
(C) Steel
(D) Tungsten
Ans: D

13. Galvanised steel wire is generally used as
(A) stay wire
(B) earth wire
(C) structural components
(D) all of the above
Ans: D

14. By which of the following systems electric power may be transmitted ?
(A) Overhead system
(B) Underground system
(C) Both (A) and (B)
(D) None of the above
Ans: C

15. are the conductors, which connect the consumer’s terminals to the distribution
(A) Distributors
(B) Service mains
(C) Feeders
(D) None of the above
Ans: B

16. The wooden poles well impregnated with creosite oil or any preservative compound have life
(A) from 2 to 5 years
(B) 10 to 15 years
(C) 25 to 30 years
(D) 60 to 70 years
Ans: C

17. Low voltage cables are meant for use up to
(A)l.lkV
(B)3.3kV
(C)6.6kV
(D)llkV
Ans: A

18. The operating voltage of high voltage cables is up to
(A)l.lkV
(B)3.3kV
(C)6.6kV
(D)llkV
Ans: D

19. The usual spans with R.C.C. poles are
(A) 40—50 meters
(B) 60—100 meters
(C) 80—100 meters
(D) 300—500 meters
Ans: C

20. The voltage of the single phase supply to residential consumers is
(A) 110 V
(B) 210 V
(C) 230 V
(D) 400 V
Ans: C
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