Electrical Machines In speed control of DC Series motor, speed lower than the rated speed can be obtained by Connecting an additional resistance in stator circuit. Connecting an additional resistance in the armature circuit. Connecting an additional resistance in the field circuit. Any of the above. Connecting an additional resistance in stator circuit. Connecting an additional resistance in the armature circuit. Connecting an additional resistance in the field circuit. Any of the above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under commutation results in sparking at the middle of the brush. sparking the trailing edge of the brush. sparking at the leading edge of the brush. no sparking. sparking at the middle of the brush. sparking the trailing edge of the brush. sparking at the leading edge of the brush. no sparking. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Demagnetization effects which of the following? both B and C reduces the terminal voltage reduction in main field flux commutation both B and C reduces the terminal voltage reduction in main field flux commutation ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation. increase decrease. be unpredictable. remain the same. increase decrease. be unpredictable. remain the same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________. kept constant to certain value. increased. decreased. remains unchanged. kept constant to certain value. increased. decreased. remains unchanged. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC compound motor the field regulator is provided to control the armature flux. demagnetize the field partially. limit the armature current. control the field flux. control the armature flux. demagnetize the field partially. limit the armature current. control the field flux. ANSWER DOWNLOAD EXAMIANS APP
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