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Electrical Engineering
Electrical Cables
Quiz 2
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Q.1
A cable carrying alternating current has
Hysteresis losses only
Hysteresis and leakage losses only
Hysteresis, leakage and copper losses only
Hysteresis, leakage, copper and friction losses
Q.2
The relative permittivity of rubber is
Between 2 and 3
Between 5 and 6
Between 8 and 10
Between 12 and 14
Q.3
If the length of a cable is doubled, its capacitance
Becomes one-fourth
Becomes one-half
Becomes double
Remains unchanged
Q.4
Cables for 220 kV lines are invariably
Mica insulated
Paper insulated
Compressed oil or compressed gas insulated
Rubber insulated
Q.5
The metallic sheath may be made of lead or lead alloy or of aluminum.
Yes
No
Q.6
A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
One half
Double
Four times
None of the above
Q.7
The breakdown of insulation of the cable can be avoided economically by the use of
Inter-sheaths
Insulating materials with different dielectric constants
Both (A) and (B)
None of the above
Q.8
In a cable, the maximum stress under operating conditions is at
Insulation layer
Sheath
Armour
Conductor surface
Q.9
In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
Yes
No
Q.10
The minimum dielectric stress in a cable is at
Armour
Bedding
Conductor surface
Lead sheath
Q.11
The breakdown voltage of a cable depends on
Presence of moisture
Working temperature
Time of application of the voltage
All of the above
Q.12
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
Absence of harmonics
Nonexistence of any stability limit
Smaller dielectric loss
Absence of ripples
Q.13
Which of the following insulation is used in cables?
Varnished cambric
Rubber
Paper
Any of the above
Q.14
The insulating material should have
Low permittivity
High resistivity
High dielectric strength
All of the above
Q.15
Capacitance grading of cable implies
Use of dielectrics of different permeabilities
Grading according to capacitance of cables per km length
Cables using single dielectric in different concentrations
Capacitance required to be introduced at different lengths to counter the effect of inductance
Q.16
High tension cables are generally used up to
11 kV
33 kV
66 kV
132 kV
Q.17
The inters heaths in the cables are used to
Minimize the stress
Avoid the requirement of good insulation
Provide proper stress distribution
None of the above
Q.18
Conduit pipes are normally used to protect ________ cables.
Unsheathed cables
Armoured
PVC sheathed cables
All of the above
Q.19
_________ cables are used for 132 kV lines.
High tension
Super tension
Extra high tension
Extra super voltage
Q.20
It is difficult to maintain oil filled cables.
Yes
No
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