DGVCL Exam Paper (11-12-2011) In the protection of transformers, harmonic restraint is used to guard against Lightning Magnetizing inrush current Switching over voltages Unbalanced protection Lightning Magnetizing inrush current Switching over voltages Unbalanced protection ANSWER EXPLANATION DOWNLOAD EXAMIANS APP Initial inrush of magnetizing currents have high component of even and odd harmonics.2nd - 63%3rd -26.8%4th- 5.1%5th- 4.1%6th- 3.77th-2.4
DGVCL Exam Paper (11-12-2011) The best location of the power factor correction equipment to be installed in the transmission line is at Any place The receiving end The sending end Middle of the line Any place The receiving end The sending end Middle of the line ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The mutual inductance between two unity coupled coils of 9 H and 4 H is 13 H 6 H 36 H 2.2 H 13 H 6 H 36 H 2.2 H ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) Hysteresis in an instrument means The inaccuracy due to change in temperature The change in the same reading when the input is first increased and then decreased The repeatability of the instrument The reliability of the instrument The inaccuracy due to change in temperature The change in the same reading when the input is first increased and then decreased The repeatability of the instrument The reliability of the instrument ANSWER DOWNLOAD EXAMIANS APP
DGVCL Exam Paper (11-12-2011) The main advantage of using fractional pitch winding is to refuce Amount of copper in the winding Harmonics in the generated emf Size of the machine Cost of the machine Amount of copper in the winding Harmonics in the generated emf Size of the machine Cost of the machine ANSWER EXPLANATION DOWNLOAD EXAMIANS APP due to fractional pitch EMF can be approximately made into sine wavelosses due to harmonics reducedsaving in conductor materialmechanical strength of coil is increased.
DGVCL Exam Paper (11-12-2011) A Mho relay is a Voltage restrained directional relay Voltage controlled over current relay Directional restrained over current relay Directional restrained over voltage relay Voltage restrained directional relay Voltage controlled over current relay Directional restrained over current relay Directional restrained over voltage relay ANSWER DOWNLOAD EXAMIANS APP
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