DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for both major and minor faults
Tripping for minor faults and alarm for major faults
Alarm for both major and minor faults
Tripping for major faults and alarm for minor faults

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

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

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

The reliability of the instrument
The change in the same reading when the input is first increased and then decreased
The repeatability of the instrument
The inaccuracy due to change in temperature

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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)
A Mho relay is a

Voltage restrained directional relay
Voltage controlled over current relay
Directional restrained over voltage relay
Directional restrained over current relay

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