Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
Conduit pipes are normally used to protect ________ cables.
Conduit pipes are normally used to protect ________ cables.
The advantage of cables over overhead transmission lines is
The advantage of cables over overhead transmission lines is
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
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
PVC stands for
PVC stands for
Which of the following insulation is used in cables?
Which of the following insulation is used in cables?
Cables for 220 kV lines are invariably
Cables for 220 kV lines are invariably
The relative permittivity of rubber is
The relative permittivity of rubber is
In capacitance grading of cables we use a _________ dielectric.
In capacitance grading of cables we use a _________ dielectric.
Underground cables are laid at sufficient depth
Underground cables are laid at sufficient depth
The disadvantage with paper as insulating material is
The disadvantage with paper as insulating material is
The insulating material should have
The insulating material should have
Capacitance grading of cable implies
Capacitance grading of cable implies
The breakdown of insulation of the cable can be avoided economically by the use of
The breakdown of insulation of the cable can be avoided economically by the use of
The minimum dielectric stress in a cable is at
The minimum dielectric stress in a cable is at
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
The current carrying capacity of cables in D.C. is more than that in A.C. mainly due to
High tension cables are generally used up to
High tension cables are generally used up to
Pressure cables are generally not used beyond
Pressure cables are generally not used beyond
The advantage of oil filled cables is
The advantage of oil filled cables is
The insulating material for a cable should have
The insulating material for a cable should have
It is difficult to maintain oil filled cables.
It is difficult to maintain oil filled cables.
Natural rubber is obtained from milky sap of tropical trees.
Natural rubber is obtained from milky sap of tropical trees.
Copper as conductor for cables is used as
Copper as conductor for cables is used as
The electrostatic stress in underground cables is
The electrostatic stress in underground cables is
The breakdown voltage of a cable depends on
The breakdown voltage of a cable depends on
Which of the following protects a cable against mechanical injury?
Which of the following protects a cable against mechanical injury?
_________ cables are used for 132 kV lines.
_________ cables are used for 132 kV lines.
The inters heaths in the cables are used to
The inters heaths in the cables are used to
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be
The thickness of metallic shielding on cables is usually
The thickness of metallic shielding on cables is usually
Rubber is most commonly used insulation in cables.
Rubber is most commonly used insulation in cables.
Empire tape is
Empire tape is
Low tension cables are generally used up to
Low tension cables are generally used up to
If the length of a cable is doubled, its capacitance
If the length of a cable is doubled, its capacitance
The thickness of the layer of insulation on the conductor, in cables, depends upon
The thickness of the layer of insulation on the conductor, in cables, depends upon
In a cable the voltage stress is maximum at
In a cable the voltage stress is maximum at
The bedding on a cable consists of
The bedding on a cable consists of
In a cable, the maximum stress under operating conditions is at
In a cable, the maximum stress under operating conditions is at
In the cables, the location of fault is usually found out by comparing
In the cables, the location of fault is usually found out by comparing
The surge resistance of cable is
The surge resistance of cable is
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
The metallic sheath may be made of lead or lead alloy or of aluminum.
The metallic sheath may be made of lead or lead alloy or of aluminum.
In cables the charging current
In cables the charging current
In case of three core flexible cable the color of the neutral is
In case of three core flexible cable the color of the neutral is
In a cable immediately above metallic sheath ________ is provided.
In a cable immediately above metallic sheath ________ is provided.
In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
In congested areas where excavation is expensive and inconvenient 'draw in system' of laying of underground cables is often adopted.
The insulating material for cables should
The insulating material for cables should
The insulation of the cable decreases with
The insulation of the cable decreases with
Solid type cables are considered unreliable beyond 66 kV because
Solid type cables are considered unreliable beyond 66 kV because
A cable carrying alternating current has
A cable carrying alternating current has
Polyethylene has very poor dielectric and ageing properties.
Polyethylene has very poor dielectric and ageing properties.
In the cables, sheaths are used to
In the cables, sheaths are used to
In capacitance grading a homogeneous dielectric is used.
In capacitance grading a homogeneous dielectric is used.
The material for armouring on cable is usually
The material for armouring on cable is usually
Dielectric strength of rubber is around
Dielectric strength of rubber is around
In single core cables armouring is not done to
In single core cables armouring is not done to
Cables, generally used beyond 66 kV are
Cables, generally used beyond 66 kV are
