The disadvantage of transmission lines as compared to cables is

GETCO Exam Paper (30-11-2008)
The disadvantage of transmission lines as compared to cables is

All of these

exposure to lightening

exposure to atmosphere hazards like smoke, ice, etc.

inductive interference between power communication circuits

All of these

exposure to lightening

exposure to atmosphere hazards like smoke, ice, etc.

inductive interference between power communication circuits

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GETCO Exam Paper (30-11-2008)
Corona usually occurs when the electrostatic stress in the air around the conductor succeeds

6.6 kV (rms value)/cm

11 kV (rms value)/cm

22 kV (maximum value)/cm

30 kV (maximum value)/cm

6.6 kV (rms value)/cm

11 kV (rms value)/cm

22 kV (maximum value)/cm

30 kV (maximum value)/cm

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GETCO Exam Paper (30-11-2008)
Graded time lag over current relaying without directional features can be employed for protection of

parallel feeders

ring mains

none of these

radial feeders

parallel feeders

ring mains

none of these

radial feeders

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GETCO Exam Paper (30-11-2008)
The number of pilot wires required for protecting 3-phase transmission lines using Translay System of protection is

6

4

3

2

6

4

3

2

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GETCO Exam Paper (30-11-2008)
Transmission efficiency increases as

voltage and power factor both increase

voltage increases but power factor decreases

voltage and power factor both decrease

voltage decreases but power factor increases

voltage and power factor both increase

voltage increases but power factor decreases

voltage and power factor both decrease

voltage decreases but power factor increases

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GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is

large internal fault

saturation of magnetic circuit

over load

any of the above

large internal fault

saturation of magnetic circuit

over load

any of the above

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GETCO Exam Paper (30-11-2008)

GETCO Exam Paper (30-11-2008) The disadvantage of transmission lines as compared to cables is

GETCO Exam Paper (30-11-2008) Corona usually occurs when the electrostatic stress in the air around the conductor succeeds

GETCO Exam Paper (30-11-2008) Graded time lag over current relaying without directional features can be employed for protection of

GETCO Exam Paper (30-11-2008) The number of pilot wires required for protecting 3-phase transmission lines using Translay System of protection is

GETCO Exam Paper (30-11-2008) Transmission efficiency increases as

GETCO Exam Paper (30-11-2008) A buchholz will operate in a transformer whenever there is

GETCO Exam Paper (30-11-2008)
The disadvantage of transmission lines as compared to cables is

GETCO Exam Paper (30-11-2008)
Corona usually occurs when the electrostatic stress in the air around the conductor succeeds

GETCO Exam Paper (30-11-2008)
Graded time lag over current relaying without directional features can be employed for protection of

GETCO Exam Paper (30-11-2008)
The number of pilot wires required for protecting 3-phase transmission lines using Translay System of protection is

GETCO Exam Paper (30-11-2008)
Transmission efficiency increases as

GETCO Exam Paper (30-11-2008)
A buchholz will operate in a transformer whenever there is