Power System - I (3140914) MCQs

MCQs of Underground Cables

Showing 11 to 20 out of 112 Questions
1 2 3 4 5 6
11.
The size of conductor used in power cables depends on
(a) Operating voltage
(b) Power factor
(c) Current to be carried
(d) Type of insulation used
Answer:

Option (c)

12.
The thickness of insulation layer provided on the conductor in cable depends on
(a) Operating voltage
(b) Current to be carried
(c) Power factor
(d) Both (a) and (b)
Answer:

Option (a)

13.
The insulating material used for cables should have all of the following except
(a) High dielectric strength,  high mechanical strength, high resistivity  and high viscosity at impregnation temperature
(b) Low thermal coefficient,  low permittivity, acid proof,  non-inflammable and non-hygroscopic
(c) High water absorption
(d) Capability of withstanding high rupturing voltages
Answer:

Option (c)

14.
The insulating material most commonly used to for power cable is
(a) PVC
(b) Paper
(c) Rubber
(d) Oil
Answer:

Option (b)

15.
The insulating material commonly used in cables is
(a) PVC
(b) Empire tape
(c) Paper
(d) Any of above
Answer:

Option (c)

16.
Empire  tape is
(a) Varnished cambric
(b) Impregnated paper
(c) Vulcanized rubber
(d) Enamel insulation
Answer:

Option (a)

17.
Relative permittivity of rubber is between
(a) 0.5 and 1
(b) 2 and 3
(c) 5 and 8
(d) 10 and 15
Answer:

Option (b)

18.
Dielectric strength of rubber is about
(a) 10 kV/mm
(b) 20 kV/mm
(c) 30 kV/mm
(d) 100 kV/mm
Answer:

Option (c)

19.
Paper as an insulating material has the main drawback that it
(a) Is hygroscopic
(b) Has poor dielectric strength
(c) Has low insulation resistance
(d) Has high capacitance
Answer:

Option (a)

20.
The maximum safe temperature of paper insulated cable is about
(a) 60 °C
(b) 95 °C
(c) 135 °C
(d) 165 °C
Answer:

Option (b)

Showing 11 to 20 out of 112 Questions
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