DGVCL Exam Paper (12-06-2016) Which of the following does not change in a transformer? Voltage Frequency Current All of these Voltage Frequency Current All of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In transformer voltage and current can be raised or lowered.Frequency remains samePower and Flux remains almost constant.
DGVCL Exam Paper (12-06-2016) The Electricity Act is applicable in _____ In Gujarat only All the states of India All parts of India All parts of India except state of Jammu and Kashmir In Gujarat only All the states of India All parts of India All parts of India except state of Jammu and Kashmir ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Directional relays are based on flow of Current All of these Voltage Power Current All of these Voltage Power ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) What will happen if the primary of a transformer is connected to DC supply? 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 Transformer will operate with high efficiency Transformer will operate with low efficiency 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) If 3000 kW power is to be transmitted over a distance of 30 km, the desirable transmission voltage will be 66 kV 11 kV 132 kV 33 kV 66 kV 11 kV 132 kV 33 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 : 20 kVA None of these 34.64 kVA 75 kVA 20 kVA None of these 34.64 kVA 75 kVA ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For three phase,VA = √3 V IFor single phase, kVA = V I
EXAMIANS