DGVCL Exam Paper (12-06-2016) The transformer works on the principle of: Mutual induction None of these Mutual capacitance All of these Mutual induction None of these Mutual capacitance All of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Transformer is static device.two or more stationary electrical circuit mutually linked by magnetic circuit.assumptions of ideal transformer:1. there are no losses.2. whole magnetic flux constant no leakage.3. permeability of core is infinite.
DGVCL Exam Paper (12-06-2016) Which of the following does not change in a transformer? Frequency Current Voltage All of these Frequency Current Voltage All of these ANSWER EXPLANATION DOWNLOAD EXAMIANS APP In transformer voltage and current can be raised or lowered.Frequency remains samePower and Flux remains almost constant.
DGVCL Exam Paper (12-06-2016) Which of the following circuit breakers has high reliability & minimum maintenance? Vacuum CB Air blast CB Sulphur hexafluoride CB Bulk oil type CB Vacuum CB Air blast CB Sulphur hexafluoride CB Bulk oil type CB ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Efficiency of a power transformer is of the order of : 0.5 0.98 1 0.25 0.5 0.98 1 0.25 ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) A relay used for protection of motors against overload is : Thermal relay Buchholz's relay Electromagnetic attraction type Impedance relay Thermal relay Buchholz's relay Electromagnetic attraction type Impedance relay ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The main disadvantages of having poor power factors are: High energy loss in conductor All of these High cost of station and distribution equipment Poor voltage regulation High energy loss in conductor All of these High cost of station and distribution equipment Poor voltage regulation ANSWER DOWNLOAD EXAMIANS APP
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