DGVCL Exam Paper (12-06-2016) Earthing switch is used for? All of these Discharging residual energies Protection of equipment from ground faults Measuring of safety voltage All of these Discharging residual energies Protection of equipment from ground faults Measuring of safety voltage ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Wave trap is used to trap waves of: Higher frequencies entering generator or transformer units All of these None of these Power frequencies Higher frequencies entering generator or transformer units All of these None of these Power frequencies ANSWER DOWNLOAD EXAMIANS APP
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 60 Volts 120 Volts 480 Volts 30 Volts 60 Volts 120 Volts 480 Volts ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For transformer, V2/V1 = N2/N1V2/120 = 50/200V2 = 30 V
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 _____ 0.3 0.4 0.5 0.2 0.3 0.4 0.5 0.2 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP %error = 100 * (actual - measured )/ actual
DGVCL Exam Paper (12-06-2016) _____ are used where it is necessary to control a circuit by a low power signal. Relays Electric Motor None of these Transformer Relays Electric Motor None of these Transformer ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Isolator in substation is open under _____ condition. Short circuit Full load No load None of these Short circuit Full load No load None of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Isolators do not have capacity to make or breake circuit when current flowing in circuit
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