Cables Electrical Engineering Questions and Answers - ObjectiveBooks

Cables Electrical Engineering Questions and Answers

Practice Test: Question Set - 05

1. In case of three core flexible cable the color of the neutral is
    (A) Blue
    (B) Black
    (C) Brown
    (D) None of the above

2. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
    (A) 5 kV/mm
    (B) 10 kV/mm
    (C) 15 kV/mm
    (D) 30 kV/mm

3. In a cable the voltage stress is maximum at
    (A) Sheath
    (B) Insulator
    (C) Surface of the conductor
    (D) Core of the conductor

4. The insulating material should have
    (A) Low permittivity
    (B) High resistivity
    (C) High dielectric strength
    (D) All of the above

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

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

7. The insulation of the cable decreases with
    (A) The increase in length of the insulation
    (B) The decrease in the length of the insulation
    (C) Either (A) or (B)
    (D) None of the above

8. In the cables, sheaths are used to
    (A) Prevent the moisture from entering the cable
    (B) Provide enough strength
    (C) Provide proper insulation
    (D) None of the above

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

10. The inters heaths in the cables are used to
    (A) Minimize the stress
    (B) Avoid the requirement of good insulation
    (C) Provide proper stress distribution
    (D) None of the above

11. The advantage of cables over overhead transmission lines is
    (A) Easy maintenance
    (B) Low cost
    (C) Can be used in congested areas
    (D) Can be used in high voltage circuits

12. Cables for 220 kV lines are invariably
    (A) Mica insulated
    (B) Paper insulated
    (C) Compressed oil or compressed gas insulated
    (D) Rubber insulated

13. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
    (A) 2 cm
    (B) 10 cm
    (C) 50 cm
    (D) 400 cm

14. The advantage of oil filled cables is
    (A) More perfect impregnation
    (B) Smaller overall size
    (C) No ionization, oxidation and formation of voids
    (D) All of the above

15. Polyethylene has very poor dielectric and ageing properties.
    (A) Yes
    (B) No

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