Cables MCQs | Cables Multiple Choice Questions and Answers

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Questions
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

Answer: 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
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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

Electrical Cables – Multiple Choice Questions with Answers | EBook

4 In a cable immediately above metallic sheath _____ is provided.
A earthing connection
B bedding
C armouring
D none of the above

Answer: bedding
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

Answer: blue
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

Answer: 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

Answer: 30 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

Answer: 1000 V
10 The surge resistance of cable is
A 5 ohms
B 20 ohms
C 50 ohms
D 100 ohms

Answer: 50 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

Answer: composite
14 Pressure cables are generally not used beyond
A 11 kV
B 33 kV
C 66 kV
D 132 kV

Answer: 66 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

Answer: between 2 and 3
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

Answer: becomes double
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

Answer: 10 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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