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Free download in PDF Cables Multiple Choice 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.
(1)
The insulating material for a cable should have
[A]
low cost
[B]
high dielectric strength
[C]
high mechanical strength
[D]
all of the above
(2)
Empire tape is
[A]
varnished cambric
[B]
vulcanised rubber
[C]
impregnated paper
[D]
none of the above
Answer: varnished cambric
(3)
The insulating material for cables should
[A]
be acid proof
[B]
be non-inflammable
[C]
be non-hygroscopic
[D]
have all above properties
Answer: have all above properties
(4)
In a cable immediately above metallic sheath _____ is provided.
[A]
earthing connection
[B]
bedding
[C]
armouring
[D]
none of the above
(5)
In case of three core flexible cable the colour of the neutral is
[A]
blue
[B]
black
[C]
brown
[D]
none of the above
(6)
cables are used for 132 kV lines.
[A]
High tension
[B]
Super tension
[C]
Extra high tension
[D]
Extra super voltage
Answer: Extra super voltage
(7)
The minimum dielectric stress in a cable is at
[A]
armour
[B]
bedding
[C]
conductor surface
[D]
lead sheath
(8)
Dielectric strength of rubber is around
[A]
5 kV/mm
[B]
15 kV/mm
[C]
30 kV/mm
[D]
200 kV/mm
(9)
Low tension cables are generally used up to
[A]
200 V
[B]
500 V
[C]
1000 V
[D]
None of the Above
(10)
The surge resistance of cable is
[A]
5 ohms
[B]
20 ohms
[C]
50 ohms
[D]
100 ohms
(11)
PVC stands for
[A]
polyvinyl chloride
[B]
post varnish conductor
[C]
pressed and varnished cloth
[D]
positive voltage conductor
Answer: polyvinyl chloride
(12)
In the cables, the location of fault is usually found out by comparing
[A]
the resistance of the conductor
[B]
the inductance of conductors
[C]
the capacitances of insulated conductors
[D]
all above parameters
Answer: the capacitances of insulated conductors
(13)
In capacitance grading of cables we use a ______ dielectric.
[A]
composite
[B]
porous
[C]
homogeneous
[D]
hygroscopic
(14)
Pressure cables are generally not used beyond
[A]
11 kV
[B]
33 kV
[C]
66 kV
[D]
132 kV
(15)
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
(16)
Solid type cables are considered unreliable beyond 66 kV because
[A]
insulation may melt due to higher temperature
[B]
skin effect dominates on the conductor
[C]
of corona loss between conductor and sheath material
[D]
there is a danger of breakdown of insulation due to the presence of voids
Answer: there is a danger of breakdown of insulation due to the presence of voids
(17)
If the length of a cable is doubled, its capacitance
[A]
becomes one-fourth
[B]
becomes one-half
[C]
becomes double
[D]
remains unchanged
(18)
In cables the charging current
[A]
lags the voltage by 90°
[B]
leads the voltage by 90°
[C]
lags the voltage by 180°
[D]
leads the voltage by 180°
Answer: leads the voltage by 90°
(19)
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
(20)
The intersheaths 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
Answer: provide proper stress distribution
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