DGVCL Exam Paper (12-06-2016) Efficiency of a power transformer is of the order of : 0.5 0.25 0.98 1 0.5 0.25 0.98 1 ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The transformer works on the principle of: Mutual capacitance All of these Mutual induction None of these Mutual capacitance All of these Mutual induction None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Transformer is static device.two or more stationary electrical circuit mutually linked by magnetic circuit.assumptions of ideal transformer:1. there are no losses.2. whole magnetic flux constant no leakage.3. permeability of core is infinite.
DGVCL Exam Paper (12-06-2016) Directional relays are based on flow of Power Current All of these Voltage Power Current All of these Voltage ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The overall efficiency of Thermal Power Plant is equal to _____ Renkine Cycle Efficiency None of these Carnot cycle efficiency Regenerative Cycle Efficiency Renkine Cycle Efficiency None of these Carnot cycle efficiency Regenerative Cycle Efficiency ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Product of boiler efficiency, turbine efficiency and generator efficiency.
DGVCL Exam Paper (12-06-2016) The time of closing the cycle, in modern circuit breakers is 0.1 sec. 0.003 sec. 0.01 sec. 0.001 sec. 0.1 sec. 0.003 sec. 0.01 sec. 0.001 sec. ANSWER DOWNLOAD EXAMIANS APP
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: Transformer may start to smoke and burn Current will be too much high No effect Eddy Current and Hysteresis losses will be excessive Transformer may start to smoke and burn Current will be too much high No effect Eddy Current and Hysteresis losses will be excessive ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Core loss of transformer = Hysteresis loss + eddy current lossHysteresis loss prpotional to feddy current loss prpotional to f².
EXAMIANS