Electrical Machines In a DC generator sparking between brushes and commutator surface may be due to any of the above. over commutation. under commutation. too rapid reversal of current. any of the above. over commutation. under commutation. too rapid reversal of current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to? 1000 rpm 950 rpm 975 rpm 940 rpm 1000 rpm 950 rpm 975 rpm 940 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine, the armature windings are placed on the rotor because of necessity for generation of voltage. development of torque. electromechanical energy conversion. commutation. generation of voltage. development of torque. electromechanical energy conversion. commutation. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The flux is maximum in the following part of a DC motor: under the interpole. under leading pole tip. pole core. under trailing pole tip. under the interpole. under leading pole tip. pole core. under trailing pole tip. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to √Ia. Ia. 1/Ia. Ia2. √Ia. Ia. 1/Ia. Ia2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Speed of DC motor can be controlled by varying resistance of armature culture. all of these. its flux oer pole. applied voltage. resistance of armature culture. all of these. its flux oer pole. applied voltage. ANSWER DOWNLOAD EXAMIANS APP
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