Electrical Machines Minimum allowable resistivity of power transformer insulating oil is generally taken as 4 X 1012 Ω - cm at 27°C and 0.4 X 1012 2 X 1012 Ω - cm at 27°C and 0.2 X 1012 3 X 1012 Ω - cm at 27°C and 0.3 X 1012 1 X 1012 Ω - cm at 27°C and 0.1 X 1012 4 X 1012 Ω - cm at 27°C and 0.4 X 1012 2 X 1012 Ω - cm at 27°C and 0.2 X 1012 3 X 1012 Ω - cm at 27°C and 0.3 X 1012 1 X 1012 Ω - cm at 27°C and 0.1 X 1012 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The commutator segments of DC machines are made up of copper copper alloy brass hard-drawn copper copper copper alloy brass hard-drawn copper ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a standard frequency the machine operates at a particular speed known as synchronous speed. any of the above. normal speed. slip speed. synchronous speed. any of the above. normal speed. slip speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines At what power factor, the voltage regulation of a transformer can be zero ? Unity power factor. Leading power factor. Zero power factor. Lagging power factor. Unity power factor. Leading power factor. Zero power factor. Lagging power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Breadth factor is defined as the ratio of emf with concentrated winding to emf with distributed winding. both 1 and 2. emf with distributed winding to emf with concentrated winding. None of these emf with concentrated winding to emf with distributed winding. both 1 and 2. emf with distributed winding to emf with concentrated winding. None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to coil resistance. armature emf. reactance voltage induced in the coil. None of these coil resistance. armature emf. reactance voltage induced in the coil. None of these ANSWER DOWNLOAD EXAMIANS APP
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