DGVCL Exam Paper (11-12-2011)

DGVCL Exam Paper (11-12-2011)
In a series RLC circuit at resonance

Current is maximum and power factor is 0.5

Current is maximum and power factor is unity

Current is minimum and power factor is unity

Current is minimum and power factor is 0.5

Current is maximum and power factor is 0.5

Current is maximum and power factor is unity

Current is minimum and power factor is unity

Current is minimum and power factor is 0.5

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DGVCL Exam Paper (11-12-2011)
The purpose of providing a choke in a tube light is

To limit the current to an appropriate value

To avoid radio interference

To eliminate corona effect

To improve the power factor

To limit the current to an appropriate value

To avoid radio interference

To eliminate corona effect

To improve the power factor

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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

Increasing the turbine valve opening

Excitation control

Phase shifting transformer

Single pole switching of circuit breakers

Increasing the turbine valve opening

Excitation control

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

Are inverse of each other

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

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DGVCL Exam Paper (11-12-2011)
In which of the following motors, the stator and rotor magnetic fields rotate at the same speed?

Reluctance motor

Induction motor

Universal motor

Synchronous motor

Reluctance motor

Induction motor

Universal motor

Synchronous motor

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low voltage

Low copper as well as iron loss

Low copper loss

Low iron loss

Low voltage

Low copper as well as iron loss

Low copper loss

Low iron loss

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