DGVCL Exam Paper (12-06-2016) SF₆ gas: Is lighter than air Is yellow in colour Is nontoxic Has pungent smell Is lighter than air Is yellow in colour Is nontoxic Has pungent smell ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Which of the following does not change in a transformer? Current All of these Frequency Voltage Current All of these Frequency Voltage 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) What will happen if the primary of a transformer is connected to DC supply? Transformer may start to smoke and burn Transformer will operate with low efficiency Transformer will operate with high efficiency No effect Transformer may start to smoke and burn Transformer will operate with low efficiency Transformer will operate with high efficiency No effect ANSWER EXPLANATION DOWNLOAD EXAMIANS APP transformer works on principle of faraday's law of electromagnetic induction. So if D.C supply use, no indction are produced and due to this E.M.F not induced in winding and transfer of electrical energy is not possible.
DGVCL Exam Paper (12-06-2016) The friction losses in Real Transformers are : 0 0.05 0.25 0.5 0 0.05 0.25 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) A fuse wire should have : High specific resistance and high melting point Low specific resistance and low melting point High specific resistance and low melting point Low specific resistance and high melting point High specific resistance and high melting point Low specific resistance and low melting point High specific resistance and low melting point Low specific resistance and high melting point ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) For 11 kV line the inductance per km per phase will be of the order of: 1 mH 0.1 H 0.1 mH 1 H 1 mH 0.1 H 0.1 mH 1 H ANSWER DOWNLOAD EXAMIANS APP
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