Q.1
A cable carrying alternating current has
Q.2
The relative permittivity of rubber is
Q.3
If the length of a cable is doubled, its capacitance
Q.4
Cables for 220 kV lines are invariably
Q.5
The metallic sheath may be made of lead or lead alloy or of aluminum.
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
Q.7
The breakdown of insulation of the cable can be avoided economically by the use of
Q.8
In a cable, the maximum stress under operating conditions is at
Q.9
In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
Q.10
The minimum dielectric stress in a cable is at
Q.11
The breakdown voltage of a cable depends on
Q.12
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
Q.13
Which of the following insulation is used in cables?
Q.14
The insulating material should have
Q.15
Capacitance grading of cable implies
Q.16
High tension cables are generally used up to
Q.17
The inters heaths in the cables are used to
Q.18
Conduit pipes are normally used to protect ________ cables.
Q.19
_________ cables are used for 132 kV lines.
Q.20
It is difficult to maintain oil filled cables.
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