DGVCL Exam Paper (12-06-2016) What will happen if the primary of a transformer is connected to DC supply? Transformer will operate with high efficiency Transformer may start to smoke and burn No effect Transformer will operate with low efficiency Transformer will operate with high efficiency Transformer may start to smoke and burn No effect Transformer will operate with low efficiency 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 UGVCL is operative in the _____ Gujarat. Central Western Northern Southern Central Western Northern Southern ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) A relay used for protection of motors against overload is : Buchholz's relay Impedance relay Electromagnetic attraction type Thermal relay Buchholz's relay Impedance relay Electromagnetic attraction type Thermal relay ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) Increasing the number of turns of wire on the secondary of a transformer will Increase the primary current Have no effect on the secondary current Increase the secondary current Decrease the secondary current Increase the primary current Have no effect on the secondary current Increase the secondary current Decrease the secondary current ANSWER EXPLANATION DOWNLOAD EXAMIANS APP transformer ratio K : N₂/N₁=V₂/V₁=I₁/I₂
DGVCL Exam Paper (12-06-2016) The arc temperature in Oil Circuit Breaker may reach up to _____ None of these 10,000° K 5,000° K 8,000° K None of these 10,000° K 5,000° K 8,000° K ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (12-06-2016) The acting contacts for a circuit breakers are made of : Copper Tungsten alloy Porcelain Hard-pressed carbon Stainless Steel Copper Tungsten alloy Porcelain Hard-pressed carbon Stainless Steel ANSWER DOWNLOAD EXAMIANS APP
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