DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Low cost of HVDC terminals
Simple protection
Minimum line power losses
No harmonic problems

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DGVCL Exam Paper (11-12-2011)
A Mho relay is a

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

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