Electrical Machines Transformer cooling and insulating oil must be of low resistivity. low viscosity. low BDV. high viscosity. low resistivity. low viscosity. low BDV. high viscosity. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The synchronous speed of an induction motor will be increased by decreasing of frequency. speed can not be increased. increasing of frequency. increasing number of poles. decreasing of frequency. speed can not be increased. increasing of frequency. increasing number of poles. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generator, the electricity produced in armature is armature is not present in DC generator. DC. None of these AC. armature is not present in DC generator. DC. None of these AC. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Where the shunt generators are widely used? Where voltage variation is needed over a wide load range. Where a constant voltage is required over a narrow load range. Where the load is very high. Where often load fluctuation is occurred. Where voltage variation is needed over a wide load range. Where a constant voltage is required over a narrow load range. Where the load is very high. Where often load fluctuation is occurred. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor speed of an induction motor is given by Ns = 120f / p × ( 1 - s ). Nr = 120f / p × (1-s). Ns = 120f /p × ( 1 - r). None of these Ns = 120f / p × ( 1 - s ). Nr = 120f / p × (1-s). Ns = 120f /p × ( 1 - r). None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A? 10% 11% 21% 41% 10% 11% 21% 41% ANSWER DOWNLOAD EXAMIANS APP
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