DGVCL Exam Paper (12-06-2016) Step-down transformer converts high voltage and low current into: High voltage and low current Low voltage and high current How voltage and high current None of these High voltage and low current Low voltage and high current How voltage and high current None of these 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) In fuel cell the _____ energy is converted into electrical energy. Chemical Sound Mechanical Heat Chemical Sound Mechanical Heat ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) True value has been 50 whereas measured value is 40 then the percentage error in the reading will be _____ 0.5 0.3 0.4 0.2 0.5 0.3 0.4 0.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP %error = 100 * (actual - measured )/ actual
DGVCL Exam Paper (12-06-2016) The rating of transformer may be expressed in _____ kW kVAR Horse power kVA kW kVAR Horse power kVA ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Equipment : RatingTransformer : kVAAlternator : kVAMotor : kW/HPBattery : ampere-hour
DGVCL Exam Paper (12-06-2016) A certain transformer has 200 turns in the primary winding, 50 turns in the secondary winding and 120 volts applied to the primary. What is the voltage across the secondary? 30 Volts 120 Volts 480 Volts 60 Volts 30 Volts 120 Volts 480 Volts 60 Volts ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For transformer, V2/V1 = N2/N1V2/120 = 50/200V2 = 30 V
DGVCL Exam Paper (12-06-2016) The friction losses in Real Transformers are : 0.05 0.5 0.25 0 0.05 0.5 0.25 0 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP As there is no rotating part in transformer, there is no friction and windage loss
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