DGVCL Exam Paper (12-06-2016) Which of the following is not a part of transformer installation? Conservator Exciter Buchholz Relay Breather Conservator Exciter Buchholz Relay Breather ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Exciter is used in alternator for field supply.
DGVCL Exam Paper (12-06-2016) Earthing switch is used for? All of these Discharging residual energies Measuring of safety voltage Protection of equipment from ground faults All of these Discharging residual energies Measuring of safety voltage Protection of equipment from ground faults ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) What will happen if the primary of a transformer is connected to DC supply? Transformer will operate with high efficiency Transformer will operate with low efficiency No effect Transformer may start to smoke and burn Transformer will operate with high efficiency Transformer will operate with low efficiency No effect 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.
DGVCL Exam Paper (12-06-2016) In a transformer the energy is conveyed from primary to secondary None of these Through cooling coil By the flux Through air None of these Through cooling coil By the flux Through air ANSWER EXPLANATION DOWNLOAD EXAMIANS APP function of transfomer is that transfer electrical energy from primary cicuit to secondary through magnetic cicuit by mutual induction
DGVCL Exam Paper (12-06-2016) Transformer core is laminated to _____ Reduce hysteresis loss Reduce copper losses Reduce all above losses Reduce eddy current losses Reduce hysteresis loss Reduce copper losses Reduce all above losses Reduce eddy current 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) The following is/are the characteristics of SF₆ circuit breakers: All of these Short break time of 2 to 2.5 cycles It does not need an auxiliary breaking chamber None of these All of these Short break time of 2 to 2.5 cycles It does not need an auxiliary breaking chamber None of these ANSWER DOWNLOAD EXAMIANS APP
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