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Electrical Engineering
Electrical Cables
Quiz 3
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Q.1
Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
Polyvinyle chloride
Vulcanised rubber
Impregnated paper
Compressed SFe gas
none of the above
Q.2
The electrostatic stress in underground cables is
Same at the conductor and the sheath
Minimum at the conductor and maximum at the sheath
Maximum at the conductor and minimum at the sheath
Zero at the conductor as well as on the sheath
Q.3
Pressure cables are generally not used beyond
11 kV
33 kV
66 kV
132 kV
Q.4
Solid type cables are considered unreliable beyond 66 kV because
Insulation may melt due to higher temperature
Skin effect dominates on the conductor
Of corona loss between conductor and sheath material
There is a danger of breakdown of insulation due to the presence of voids
Q.5
The insulation of the cable decreases with
The increase in length of the insulation
The decrease in the length of the insulation
Either (A) or (B)
None of the above
Q.6
Empire tape is
Varnished cambric
Vulcanized rubber
Impregnated paper
None of the above
Q.7
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
2 cm
10 cm
50 cm
400 cm
Q.8
The thickness of the layer of insulation on the conductor, in cables, depends upon
Reactive power
Power factor
Voltage
Current carrying capacity
Q.9
Polyethylene has very poor dielectric and ageing properties.
Yes
No
Q.10
In a cable immediately above metallic sheath ________ is provided.
Earthing connection
Bedding
Armouring
None of the above
Q.11
In capacitance grading of cables we use a _________ dielectric.
Composite
Porous
Homogeneous
Hygroscopic
Q.12
The insulating material for cables should
Be acid proof
Be non-inflammable
Be non-hygroscopic
Have all above properties
Q.13
What are two types of Twisted Pair?
Unshielded Twisted Pair
Shielded Twisted Pair
Fiber Optic
Both A & B
Q.14
Fiber optic cable is the best cable to use for long distance network connection
True
False
Q.15
Twisted pair cables are made of glass or plastic and transmits light signals
True
False
Q.16
Twisted pair cables are limited in distance and data rate
True
False
Q.17
These types of cable require highly skilled personals to install them
Twisted pair cable
Firewalls
Fiber optic
Coaxial
Q.18
___________________ cables are mainly used on cable television
Foil shielded cable
Coaxial cable
Twisted pair cable
Fiber optic cable
Q.19
The abbreviation STP stands for :
Shielded Twisted Pair
Straight Through Process
Single Topology Protocol
Shave Time Pair
Q.20
___________________ cable is divided into two categories, shielded and unshielded
Twisted pair cable
Coaxial cable
Fiber-optic cable
Optic cable
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