Ybus used in power flow studies and Zbus used in short circuit studies

DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

Are transpose of each other

Have no inter relation

Are the same

Are inverse of each other

Are transpose of each other

Have no inter relation

Are the same

Are inverse of each other

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DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Low cost of HVDC terminals

No harmonic problems

Minimum line power losses

Simple protection

Low cost of HVDC terminals

No harmonic problems

Minimum line power losses

Simple protection

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Capacitor start capacitor run motor

Split phase motor

Universal motor

Capacitor start motor

Capacitor start capacitor run motor

Split phase motor

Universal motor

Capacitor start motor

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DGVCL Exam Paper (11-12-2011)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as

Hot reserve

Cold reserve

Firm power

Spinning reserve

Hot reserve

Cold reserve

Firm power

Spinning reserve

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DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Phase shifting transformer

Single pole switching of circuit breakers

Excitation control

Increasing the turbine valve opening

Phase shifting transformer

Single pole switching of circuit breakers

Excitation control

Increasing the turbine valve opening

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DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

All of these

Trapping power frequency waves

Trapping high frequency waves entering into generator/transformer unit.

Tripping fault current

All of these

Trapping power frequency waves

Trapping high frequency waves entering into generator/transformer unit.

Tripping fault current

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DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011) Ybus used in power flow studies and Zbus used in short circuit studies

DGVCL Exam Paper (11-12-2011) Bulk power transmission over long HVDC lines are preferred on account of

DGVCL Exam Paper (11-12-2011) The motor used in celling fans is

DGVCL Exam Paper (11-12-2011) In a power plant, a reserve generating capacity which is not in service but is in operation is known as

DGVCL Exam Paper (11-12-2011) The transient stability of a power system can be improved by

DGVCL Exam Paper (11-12-2011) In carrier current protection, the purpose of the wave trap is for

DGVCL Exam Paper (11-12-2011)
Ybus used in power flow studies and Zbus used in short circuit studies

DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

DGVCL Exam Paper (11-12-2011)
In a power plant, a reserve generating capacity which is not in service but is in operation is known as

DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for