Noise Pollution Quiz | Underground Cables Multiple Choice Questions and Answers

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Questions
1 The insulating material for a cable should have
A high mechanical strength
B low cost
C high dielectric strength
D all of the above

Answer: all of the above
2 Which of the following insulation is used in cables ?
A Paper
B Varnished cambric
C Rubber
D Any of the above

Answer: Any of the above
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3 In a cable immediately above metallic sheath _____ is provided.
A Armouring
B Earthing Connection
C Bedding
D None Of The Above

Answer: Bedding
4 In single core cables armouring is not done to
A avoid excessive sheath losses
B make it flexible
C either of the above
D none of the above

Answer: avoid excessive sheath losses
5 Dielectric strength of rubber is around
A 200 kV/mm
B 30 kV/mm
C 5 kV/mm
D 15 kV/mm

Answer: 30 kV/mm
6 PVC stands for
A post varnish conductor
B positive voltage conductor
C polyvinyl chloride
D None of the above

Answer: polyvinyl chloride
7 In the cables, the location of fault is usually found out by comparing
A the inductance of conductors
B the capacitances of insulated conductors
C the resistance of the conductor
D all above parameters

Answer: the capacitances of insulated conductors
8 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
9 Solid type cables are considered unreliable beyond 66 kV because
A there is a danger of breakdown of insulation due to the presence of voids
B of corona loss between conductor and sheath material
C insulation may melt due to higher temperature
D skin effect dominates on the conductor

Answer: there is a danger of breakdown of insulation due to the presence of voids
10 In cables the charging current
A leads the voltage by 90°
B leads the voltage by 180°
C lags the voltage by 90°
D lags the voltage by 180°

Answer: leads the voltage by 90°
11 In the cables, sheaths are used to
A prevent the moisture from entering the cable
B provide proper insulation
C provide enough strength
D None Of The Above

Answer: prevent the moisture from entering the cable
12 In a cable the voltage stress is maximum at
A core of the conductor
B surface of the conductor
C sheath
D insulator

Answer: core of the conductor
13 Underground cables are laid at sufficient depth
A to avoid being unearthed easily due to removal of soil
B to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
C for all of the above reasons
D to minimise temperature stresses

Answer: to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
14 The thickness of metallic shielding on cables is usually
A 0.04 mm
B 40 to 60 mm
C 0.2 to 0.4 mm
D None Of The Above

Answer: 0.04 mm
15 The underground system is ...........costly then the equivalent overhead line system
A Greater than
B Less
C More
D Same

Answer: More
16 Metallic shielding is provided on underground cables to
A Control the electrostatic voltage stress
B Reduce thermal resistance
C Reduce corona effect
D All of the above

Answer: All of the above
17 The materials used for armouring of an underground cable is
A Galvanised steel wire
B Steel tape
C Aluminium
D Either A or B

Answer: Either A or B
18 In underground cables the electrostatic stress is
A Zerothe contactor as well as on the sheath
B Minimum at contactor surface and maximum at the sheath
C Maximum at contactor surface and minimum at the sheath
D Same at the conductor and sheath

Answer: Maximum at contactor surface and minimum at the sheath
19 Underground cables are laid at sufficient depth so as to
A Minimise temperature stresses
B Minimise effects of shocks and vibrations owing to passing vehicles etc.
C Avoid being unearthed easily owing to removal of soil
D Both A and C

Answer: Minimise effects of shocks and vibrations owing to passing vehicles etc.
20 A layer similar to bedding is provided on the armouring to protect the whole cable from all atmospheric conditions. Which layer is this?
A Serving.
B Sheath
C Insulation
D A layer of jute

Answer: Serving.

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