Electrical Machines Unbalance 3 - Φ stator currents cause vibrations. All of these double frequency currents in the rotor. heating of rotor. vibrations. All of these double frequency currents in the rotor. heating of rotor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is/are the necessary conditions for voltage build up in self excited generator? All of these Field winding resistance should be less than critical resistance. Poles should contain residual flux. Field winding should be properly connected to armature winding. All of these Field winding resistance should be less than critical resistance. Poles should contain residual flux. Field winding should be properly connected to armature winding. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following statement is correct, if short circuit ratio is high? Good voltage regulation High voltage regulation None of these Low short circuit current Good voltage regulation High voltage regulation None of these Low short circuit current ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The power factor of an induction motor operating at no load will have a value around 0.9 lag unity 0.2 lead 0.2 lag 0.9 lag unity 0.2 lead 0.2 lag ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will happen if the the supply terminals are reversed in case of a DC shunt motor? The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run in reverse direction. The motor will run much faster in the same direction. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When an electric train is moving down a hill, the DC motor will operate as DC shunt motor. DC series generator. DC series motor. DC shunt generator. DC shunt motor. DC series generator. DC series motor. DC shunt generator. ANSWER DOWNLOAD EXAMIANS APP
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