Electrical Machines A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by rotor of a dc machine. stator of a dc machine. rotor of an synchronous machine. stator of a induction machine. rotor of a dc machine. stator of a dc machine. rotor of an synchronous machine. stator of a induction machine. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is 50 Hz. 16.67 Hz. 60 Hz. 25 Hz. 50 Hz. 16.67 Hz. 60 Hz. 25 Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For small value armature current Ia the torque developed by a DC series motor is proportional to Ia2. 1/Ia. Ia. √Ia. Ia2. 1/Ia. Ia. √Ia. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are the methods to reduce the armature reaction and its effects? pole stacking compensating winding All of these pole chamfering pole stacking compensating winding All of these pole chamfering ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a three phase slip-ring induction motor, brushes are connected to DC supply. equalizing coils. 3 - Φ AC supply. external star-connected resistors. DC supply. equalizing coils. 3 - Φ AC supply. external star-connected resistors. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Satisfactory commutation of DC machine requires All of these brushes should smoothly run in the holders. brushes should be of proper grade and size. smooth, concentric commutator properly undercut. All of these brushes should smoothly run in the holders. brushes should be of proper grade and size. smooth, concentric commutator properly undercut. ANSWER DOWNLOAD EXAMIANS APP
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