DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Unbalanced protection
Lightning
Switching over voltages
Magnetizing inrush current

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

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

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

The repeatability of the instrument
The reliability 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

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