DGVCL Exam Paper (12-06-2016) The friction losses in Real Transformers are : 0 0.25 0.05 0.5 0 0.25 0.05 0.5 ANSWER EXPLANATION DOWNLOAD EXAMIANS APP As there is no rotating part in transformer, there is no friction and windage loss
DGVCL Exam Paper (12-06-2016) Directional relays are based on flow of All of these Voltage Current Power All of these Voltage Current Power 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? 60 Volts 480 Volts 30 Volts 120 Volts 60 Volts 480 Volts 30 Volts 120 Volts ANSWER EXPLANATION DOWNLOAD EXAMIANS APP For transformer, V2/V1 = N2/N1V2/120 = 50/200V2 = 30 V
DGVCL Exam Paper (12-06-2016) Reactance relay is used for protection against: Over voltage fault Earth fault None of these Phase fault Over voltage fault Earth fault None of these Phase fault ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The number of cycles in which a high speed circuit breaker can complete its operation is 20 to 30 40 to 50 10 to 18 3 to 8 20 to 30 40 to 50 10 to 18 3 to 8 ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Which of the following does not change in a transformer? All of these Current Voltage Frequency All of these Current Voltage Frequency ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In transformer voltage and current can be raised or lowered.Frequency remains samePower and Flux remains almost constant.
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