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

Are inverse of each other

Are the same

Have no inter relation

Are transpose of each other

Are inverse of each other

Are the same

Have no inter relation

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DGVCL Exam Paper (11-12-2011)
Reactance relay is used to protect against

Over voltage faults

Earth faults only

Both phase and earth faults

Phase faults only

Over voltage faults

Earth faults only

Both phase and earth faults

Phase faults only

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DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Reduce winding losses

Eliminate losses on account of fair friction

Reduce bearing friction

Eliminate hunting and provide adequate starting torque

Reduce winding losses

Eliminate losses on account of fair friction

Reduce bearing friction

Eliminate hunting and provide adequate starting torque

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DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

It is safe to human beings

It protects the secondary ciruits

It protects the primary ciruits

It avoids core saturation and high voltage induction

It is safe to human beings

It protects the secondary ciruits

It protects the primary ciruits

It avoids core saturation and high voltage induction

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DGVCL Exam Paper (11-12-2011)
If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

500 MW

217.8 MW

435.6 MW

251.5 MW

500 MW

217.8 MW

435.6 MW

251.5 MW

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The inaccuracy due to change in temperature

The reliability of the instrument

The repeatability of the instrument

The change in the same reading when the input is first increased and then decreased

The inaccuracy due to change in temperature

The reliability of the instrument

The repeatability of the instrument

The change in the same reading when the input is first increased and then decreased

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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) Reactance relay is used to protect against

DGVCL Exam Paper (11-12-2011) The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011) Under operating conditions, the secondary of a current transformer is always short ciruited because

DGVCL Exam Paper (11-12-2011) If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

DGVCL Exam Paper (11-12-2011) Hysteresis in an instrument means

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)
Reactance relay is used to protect against

DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

DGVCL Exam Paper (11-12-2011)
Under operating conditions, the secondary of a current transformer is always short ciruited because

DGVCL Exam Paper (11-12-2011)
If the voltage at the two ends of a line are 132 kV, and its reactance is 40 Ω, the stability limit of the line is

DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means