Cables Multiple Choice Questions And Answers In English -1

1. Which of the following insulation is used in cables ?
(A) Varnished cambric
(B) Rubber
(C) Paper
(D) Any of the above
Ans: D

2. Low tension cables are generally used up to
(A) 200 V
(B) 500 V
(C) 700 V
(D) 1000 V
Ans: D

3. The surge resistance of cable is
(A) 5 ohms
(B) 20 ohms
(C) 50 ohms
(D) 100 ohms
Ans: C

4. cables are used for 132 kV lines.
(A) High tension
(B) Super tension
(C) Extra high tension
(D) Extra super voltage
Ans: D

5. Empire tape is
(A) varnished cambric
(B) vulcanised rubber
(C) impregnated paper
(D) none of the above
Ans: A

6. The insulating material for a cable should have
(A) low cost
(B) high dielectric strength
(C) high mechanical strength
(D) all of the above
Ans: D

7. The thickness of the layer of insulation on the conductor, in cables, depends upon
(A) reactive power
(B) power factor
(C) voltage
(D) current carrying capacity
Ans: C

8. Which of the following protects a cable against mechanical injury ?
(A) Bedding
(B) Sheath
(C) Armouring
(D) None of the above
Ans: C

9. The bedding on a cable consists of
(A) hessian cloth
(B) jute
(C) any of the above
(D) none of the above
Ans: C

10. The insulating material for cables should
(A) be acid proof
(B) be non-inflammable
(C) be non-hygroscopic
(D) have all above properties
Ans: D

11. In a cable immediately above metallic sheath _____ is provided.
(A) earthing connection
(B) bedding
(C) armouring
(D) none of the above
Ans: B

11. Conduit pipes are normally used to protect _____ cables.
(A) unsheathed cables
(B) armoured
(C) PVC sheathed cables
(D) all of the above
Ans: A

12. The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
(A) absence of harmonics
(B) non-existence of any stability limit
(C) smaller dielectric loss
(D) absence of ripples
Ans: C

13. Dielectric strength of rubber is around
(A) 5 kV/mm
(B) 15 kV/mm
(C) 30 kV/mm
(D) 200 kV/mm
Ans: C

14. In case of three core flexible cable the colour of the neutral is
(A) blue
(B) black
(C) brown
(D) none of the above
Ans: A

15. In single core cables armouring is not done to
(A) avoid excessive sheath losses
(B) make it flexible
(C) either of the above
(D) none of the above
Ans: A

16. The minimum dielectric stress in a cable is at
(A) armour
(B) bedding
(C) conductor surface
(D) lead sheath
Ans: D

17. In capacitance grading of cables we use a ______ dielectric.
(A) composite
(B) porous
(C) homogeneous
(D) hygroscopic
Ans: A

18. The relative permittivity of rubber is
(A) between 2 and 3
(B) between 5 and 6
(C) between 8 and 10
(D) between 12 and 14
Ans: A

19. Pressure cables are generally not used beyond
(A) 11 kV
(B) 33 kV
(C) 66 kV
(D) 132 kV
Ans: C

20. In a cable, the maximum stress under operating conditions is at
(A) insulation layer
(B) sheath
(C) armour
(D) conductor surface
Ans: D