DGVCL Exam Paper (12-06-2016) Which of the following is not a part of transformer installation? Breather Exciter Conservator Buchholz Relay Breather Exciter Conservator Buchholz Relay ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Exciter is used in alternator for field supply.
DGVCL Exam Paper (12-06-2016) The kVA rating of Three-phase transformer with Voltage = 200 V and Current = 100 A will be : 34.64 kVA 75 kVA 20 kVA None of these 34.64 kVA 75 kVA 20 kVA None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For three phase,VA = √3 V IFor single phase, kVA = V I
DGVCL Exam Paper (12-06-2016) Earthing switch is used for? Protection of equipment from ground faults Discharging residual energies All of these Measuring of safety voltage Protection of equipment from ground faults Discharging residual energies All of these Measuring of safety voltage ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) With effect from _____ India has adopted a new legislation called the Electricity Act 2003. 2 May 2003 3 June 2003 2 June 2003 None of these 2 May 2003 3 June 2003 2 June 2003 None of these ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Transformer core is laminated to _____ Reduce copper losses Reduce eddy current losses Reduce hysteresis loss Reduce all above losses Reduce copper losses Reduce eddy current losses Reduce hysteresis loss Reduce all above losses ANSWER EXPLANATION DOWNLOAD EXAMIANS APP To reduce eddy current loss laminations is done.To reduce hysteresis loss good magnetic material (whose specific hysterisis loss is low) is used.
DGVCL Exam Paper (12-06-2016) What will happen if the primary of a transformer is connected to DC supply? No effect Transformer will operate with high efficiency Transformer will operate with low efficiency Transformer may start to smoke and burn No effect Transformer will operate with high efficiency Transformer will operate with low efficiency Transformer may start to smoke and burn ANSWER EXPLANATION DOWNLOAD EXAMIANS APP transformer works on principle of faraday's law of electromagnetic induction. So if D.C supply use, no indction are produced and due to this E.M.F not induced in winding and transfer of electrical energy is not possible.
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