DGVCL Exam Paper (12-06-2016) SF₆ gas: Is yellow in colour Has pungent smell Is lighter than air Is nontoxic Is yellow in colour Has pungent smell Is lighter than air Is nontoxic ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Induction cup relay is operated due to changes in : Current Impedance Voltage All of these Current Impedance Voltage All of these ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to a 500 Hz (frequency) source of the same voltage: Current will be too much high Eddy Current and Hysteresis losses will be excessive No effect Transformer may start to smoke and burn Current will be too much high Eddy Current and Hysteresis losses will be excessive No effect Transformer may start to smoke and burn ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Core loss of transformer = Hysteresis loss + eddy current lossHysteresis loss prpotional to feddy current loss prpotional to f².
DGVCL Exam Paper (12-06-2016) Which of the following is not a part of transformer installation? Conservator Exciter Breather Buchholz Relay Conservator Exciter Breather Buchholz Relay ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Exciter is used in alternator for field supply.
DGVCL Exam Paper (12-06-2016) For cost & safety, the outdoor substations are installed for voltages above: 60 kV 33 kV 110 kV 11 kV 60 kV 33 kV 110 kV 11 kV ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The kVA rating of Three-phase transformer with Voltage = 200 V and Current = 100 A will be : 75 kVA 20 kVA None of these 34.64 kVA 75 kVA 20 kVA None of these 34.64 kVA ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For three phase,VA = √3 V IFor single phase, kVA = V I
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