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) The relay operating speed depends upon All of these The rate of flux built up The spring tension Armature core air gap All of these The rate of flux built up The spring tension Armature core air gap ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) For a 66 kV line having span of 200 meters between towers the approximate sag will be 2 m. If the span is double the sag will be: 2 m 4 m 8 m 1 m 2 m 4 m 8 m 1 m ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Earthing switch is used for? Protection of equipment from ground faults Discharging residual energies Measuring of safety voltage All of these Protection of equipment from ground faults Discharging residual energies Measuring of safety voltage All of these ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The registered office of MGVCL is in _____ Godhra Valsad Ahmedabad Vadodara Godhra Valsad Ahmedabad Vadodara ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Company : Registered OffficePGVCL : RajkotMGVCL : VadodaraDGVCL : SuratUGVCL : MehsanaGETCO : VadodaraGUVNL : Vadodara
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 Transformer may start to smoke and burn No effect Current will be too much high Eddy Current and Hysteresis losses will be excessive Transformer may start to smoke and burn No effect ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Core loss of transformer = Hysteresis loss + eddy current lossHysteresis loss prpotional to feddy current loss prpotional to f².
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