Cables

11. he cables, the location of fault is usually found out by comparing

1. the resistance of the conductor
2. the inductance of conductors
3. the capacitances of insulated conductors
4. all above parameters

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12. High tension cables are generally used up to

1. 11kV
2. 33kV
3. 66 kV
4. 132 kV

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13. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be

1. 5 kV/mm
2. 10 kV/mm
3. 15 kV/mm
4. 30 kV/mm

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14. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be

1. 2 cm
2. 10 cm
3. 50 cm
4. 400 cm

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15. If the length of a cable is doubled, its capacitance

1. becomes one-fourth
2. becomes one-half
3. becomes double
4. remains unchanged

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16. In a cable immediately above metallic sheath _________ is provided.

1. earthing connection
2. bedding
3. armouring
4. none of the above

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17. In a cable the voltage stress is maximum at

1. sheath
2. insulator
3. surface of the conductor
4. core of the conductor

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18. In a cable, the maximum stress under operating conditions is at

1. insulation layer
2. sheath
3. armour
4. conductor surface

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19. In cables the charging current

1. lags the voltage by 90°
2. leads the voltage by 90°
3. lags the voltage by 180°
4. leads the voltage by 180°

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20. In capacitance grading of cables we use a _________ dielectric.

1. composite
2. porous
3. homogeneous
4. hygroscopic

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