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Free download in PDF Underground Cables Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
The material for armouring on cable is usually
[A]
steel tape
[B]
galvanised steel wire
[C]
any of the above
[D]
none of the above
42
Pressure cables are generally not used beyond
[A]
66 kV
[B]
11 kV
[C]
132 kV
[D]
33 kV
43
cables are used for 132 kV lines.
[A]
Extra super voltage
[B]
Extra high tension
[C]
High tension
[D]
Super tension
Answer: Extra super voltage
44
In case of three core flexible cable the colour of the neutral is
[A]
blue
[B]
brown
[C]
black
[D]
none of the above
45
The insulating material for cables should
[A]
have all above properties
[B]
be non-hygroscopic
[C]
be acid proof
[D]
be non-inflammable
Answer: have all above properties
46
Empire tape is
[A]
varnished cambric
[B]
vulcanised rubber
[C]
impregnated paper
[D]
none of the above
Answer: varnished cambric
47
The thickness of the layer of insulation on the conductor, in cables, depends upon
[A]
voltage
[B]
power factor
[C]
reactive power
[D]
current carrying capacity
48
The current carrying capacity of cables in D.C. is more thanthat in A.C. mainly due to
[A]
smaller dielectric loss
[B]
absence of ripples
[C]
absence of harmonics
[D]
none of the above
Answer: smaller dielectric loss
49
Low tension cables are generally used up to
[A]
1000 V
[B]
700 V
[C]
200 V
[D]
500 V
50
High tension cables are generally used up to
[A]
11kV
[B]
132 kV
[C]
33kV
[D]
66 kV
51
In capacitance grading of cables we use a ______ dielectric.
[A]
composite
[B]
hygroscopic
[C]
porous
[D]
homogeneous
52
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
[A]
10 kV/mm
[B]
30 kV/mm
[C]
5 kV/mm
[D]
none of the above
53
Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
[A]
Compressed SFe gas
[B]
Impregnated paper
[C]
Vulcanised rubber
[D]
Polyvinyle chloride
Answer: Compressed SFe gas
54
Which of the following protects a cable against mechanical injury ?
[A]
Armouring
[B]
Sheath
[C]
Bedding
[D]
None of the above
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