Corona usually occurs when the electrostatic stress in the air around the conductor succeeds

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

30 kV (maximum value)/cm

6.6 kV (rms value)/cm

22 kV (maximum value)/cm

11 kV (rms value)/cm

30 kV (maximum value)/cm

6.6 kV (rms value)/cm

22 kV (maximum value)/cm

11 kV (rms value)/cm

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GETCO Exam Paper (30-11-2008)
Bulk-oil CBs can be used for voltage upto

11 kV

66 kV

33 kV

1.1 kV

11 kV

66 kV

33 kV

1.1 kV

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GETCO Exam Paper (30-11-2008)
The arc voltage in a C.B. is _____ with the arc current

in phase

none of these

leading by 90˚

lagging by 90˚

in phase

none of these

leading by 90˚

lagging by 90˚

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GETCO Exam Paper (30-11-2008)
If a combination of HRC fuse and a C.B. is employed, the C.B. operates for

under all abnormal currents

short circuit currents

this combination is never employed in practice

low over load currents

under all abnormal currents

short circuit currents

this combination is never employed in practice

low over load currents

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GETCO Exam Paper (30-11-2008)
Minimum oil C.B. use oil for

arc quenching

lubrication

cooling

insulation

arc quenching

lubrication

cooling

insulation

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

saturation of magnetic circuit

any of the above

large internal fault

over load

saturation of magnetic circuit

any of the above

large internal fault

over load

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GETCO Exam Paper (30-11-2008)

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) Bulk-oil CBs can be used for voltage upto

GETCO Exam Paper (30-11-2008) The arc voltage in a C.B. is _____ with the arc current

GETCO Exam Paper (30-11-2008) If a combination of HRC fuse and a C.B. is employed, the C.B. operates for

GETCO Exam Paper (30-11-2008) Minimum oil C.B. use oil for

GETCO Exam Paper (30-11-2008) A buchholz will operate in a transformer whenever there 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)
Bulk-oil CBs can be used for voltage upto

GETCO Exam Paper (30-11-2008)
The arc voltage in a C.B. is _____ with the arc current

GETCO Exam Paper (30-11-2008)
If a combination of HRC fuse and a C.B. is employed, the C.B. operates for

GETCO Exam Paper (30-11-2008)
Minimum oil C.B. use oil for

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