DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
An inverse time current characteristic
A definite time cuttent characteristic
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

The reactance voltage
The cross-magnetizing effect of armature mmf
Both the cross-magnetizing mmf and the reactance voltage
The demagnetizing effect of armature mmf

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

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

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is directional proporational to torque
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Torque and speed are proportional to the square of the armature current
Torque and speed are inversely proportional to the square of the armature current

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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
Reduce bearing friction
Eliminate losses on account of fair friction
Eliminate hunting and provide adequate starting torque

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