DGVCL Exam Paper (12-06-2016) Gujarat State Electricity Corp. Ltd. (GSECL) is a _____ Regulatory Commission Power Generation Company Transmission Company Distribution Company Regulatory Commission Power Generation Company Transmission Company Distribution Company ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Distribuition Companies: PGVCL, MGVCL, UGVCL, DGVCLTransmission: GETCOGeneration: GSECL
DGVCL Exam Paper (12-06-2016) Step-down transformer converts high voltage and low current into: High voltage and low current How voltage and high current None of these Low voltage and high current High voltage and low current How voltage and high current None of these Low voltage and high current ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In step up votlage,Output votlage > Input votlageOutput current < Input currentIn step down transformerOutput votlage < Input votlageOutput current > Input current.Power and frequency remains almost constant in stepup or stepdown transformer.
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 Eddy Current and Hysteresis losses will be excessive Current will be too much high No effect Transformer may start to smoke and burn Eddy Current and Hysteresis losses will be excessive Current will be too much high 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) Increasing the number of turns of wire on the secondary of a transformer will Increase the primary current Have no effect on the secondary current Decrease the secondary current Increase the secondary current Increase the primary current Have no effect on the secondary current Decrease the secondary current Increase the secondary current ANSWER EXPLANATION DOWNLOAD EXAMIANS APP transformer ratio K : N₂/N₁=V₂/V₁=I₁/I₂
DGVCL Exam Paper (12-06-2016) Isolator in substation is open under _____ condition. Full load None of these No load Short circuit Full load None of these No load Short circuit ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Isolators do not have capacity to make or breake circuit when current flowing in circuit
DGVCL Exam Paper (12-06-2016) The friction losses in Real Transformers are : 0 0.25 0.5 0.05 0 0.25 0.5 0.05 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP As there is no rotating part in transformer, there is no friction and windage loss
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