DGVCL Exam Paper (12-06-2016) The voltage of transmission can be regulated by Use of tap changing transformers Any of the above methods Use of capacitors to neutralize the effect of series reactance Switching in shunt capacitors at the receiving end during heavy loads Use of tap changing transformers Any of the above methods Use of capacitors to neutralize the effect of series reactance Switching in shunt capacitors at the receiving end during heavy loads ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The rating of transformer may be expressed in _____ kVAR kW Horse power kVA kVAR kW Horse power kVA ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Equipment : RatingTransformer : kVAAlternator : kVAMotor : kW/HPBattery : ampere-hour
DGVCL Exam Paper (12-06-2016) Wave trap is used to trap waves of: Higher frequencies entering generator or transformer units None of these Power frequencies All of these Higher frequencies entering generator or transformer units None of these Power frequencies All of these ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The permissible voltage variation in transmission and distribution system is: ±10% ± 0.1% ± 1% ± 25% ±10% ± 0.1% ± 1% ± 25% ANSWER EXPLANATION DOWNLOAD EXAMIANS APP This answer is as per official key of respective exam.
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 Eddy Current and Hysteresis losses will be excessive No effect Transformer may start to smoke and burn Current will be too much high Eddy Current and Hysteresis losses will be excessive 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.
DGVCL Exam Paper (12-06-2016) The main advantage of AC over DC is: AC is easy to maintain & can be easily distributed at long distances AC can be easily converted into DC by using a rectifier All of these Conversion flexibility from one voltage level to other AC is easy to maintain & can be easily distributed at long distances AC can be easily converted into DC by using a rectifier All of these Conversion flexibility from one voltage level to other ANSWER DOWNLOAD EXAMIANS APP
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