Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 4% 5% 25% 2% 4% 5% 25% 2% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines It is advisable to start a DC series motor with some load to Limit the current. Avoid sparking. Limit the flux. Limit the speed. Limit the current. Avoid sparking. Limit the flux. Limit the speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In circle diagram for induction motor, diameter of circle represents which of the following ? Slip. Running torque. Line voltage. Rotor current. Slip. Running torque. Line voltage. Rotor current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is 1, 2, 3 and 4 1, 2 and 3 3 only 1, 3 1, 2, 3 and 4 1, 2 and 3 3 only 1, 3 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For P pole machine relation between electrical degrees and mechanical degrees is θelec = θmech θelec = P/2*θmech θelec = 2/P*θmech θelec = 4/P*θmech θelec = θmech θelec = P/2*θmech θelec = 2/P*θmech θelec = 4/P*θmech ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If field current is decreased in shunt dc motor, the speed of the motor decreases. increases. None of these remains same. decreases. increases. None of these remains same. ANSWER DOWNLOAD EXAMIANS APP
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