DGVCL Exam Paper (12-06-2016) Which of the following does not change in a transformer? Voltage All of these Current Frequency Voltage All of these Current Frequency 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) _____ are used where it is necessary to control a circuit by a low power signal. None of these Relays Transformer Electric Motor None of these Relays Transformer Electric Motor ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Induction cup relay is operated due to changes in : Impedance Voltage All of these Current Impedance Voltage All of these Current ANSWER DOWNLOAD EXAMIANS APP
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 None of these It does not need an auxiliary breaking chamber All of these Short break time of 2 to 2.5 cycles None of these It does not need an auxiliary breaking chamber ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The problematic pollutants in emission of coal based generating plants _____ SO₂ All of these CO NOx SO₂ All of these CO NOx ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Transformer core is laminated to _____ 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 Reduce hysteresis loss 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.
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