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Electrical Engineering
Electrical Cables
Quiz 1
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Q.1
The material for armouring on cable is usually
Steel tape
Galvanized steel wire
Any of the above
None of the above
Q.2
In the cables, sheaths are used to
Prevent the moisture from entering the cable
Provide enough strength
Provide proper insulation
None of the above
Q.3
Natural rubber is obtained from milky sap of tropical trees.
Yes
No
Q.4
PVC stands for
Polyvinyl chloride
Post varnish conductor
Pressed and varnished cloth
Positive voltage conductor
Q.5
The advantage of cables over overhead transmission lines is
Easy maintenance
Low cost
Can be used in congested areas
Can be used in high voltage circuits
Q.6
Cables, generally used beyond 66 kV are
Oil filled
S.L. type
Belted
Armoured
Q.7
The surge resistance of cable is
5 ohms
20 ohms
50 ohms
100 ohms
Q.8
Rubber is most commonly used insulation in cables.
Yes
No
Q.9
The advantage of oil filled cables is
More perfect impregnation
Smaller overall size
No ionization, oxidation and formation of voids
All of the above
Q.10
In the cables, the location of fault is usually found out by comparing
The resistance of the conductor
The inductance of conductors
The capacitances of insulated conductors
All above parameters
Q.11
In single core cables armouring is not done to
Avoid excessive sheath losses
Make it flexible
Either of the above
None of the above
Q.12
In a cable the voltage stress is maximum at
Sheath
Insulator
Surface of the conductor
Core of the conductor
Q.13
The disadvantage with paper as insulating material is
It is hygroscopic
It has high capacitance
It is an organic material
None of the above
Q.14
The thickness of metallic shielding on cables is usually
0.04 mm
0.2 to 0.4 mm
3 to 5 mm
40 to 60 mm
Q.15
Copper as conductor for cables is used as
Annealed
Hardened and tempered
Hard drawn
Alloy with chromium
Q.16
In case of three core flexible cable the color of the neutral is
Blue
Black
Brown
None of the above
Q.17
Which of the following protects a cable against mechanical injury?
Bedding
Sheath
Armouring
None of the above
Q.18
In cables the charging current
Lags the voltage by 90°
Leads the voltage by 90°
Lags the voltage by 180°
Leads the voltage by 180°
Q.19
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
5 kV/mm
10 kV/mm
15 kV/mm
30 kV/mm
Q.20
Low tension cables are generally used up to
200 V
500 V
700 V
1000 V
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