Electrical Machines To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by shifting the brush axis from GNA to MNA. compensating winding and commutating poles. increasing field excitation. fixing the brush axis inline with the pole axis. shifting the brush axis from GNA to MNA. compensating winding and commutating poles. increasing field excitation. fixing the brush axis inline with the pole axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The DC compound motors are generally Differentical compound. Level Compound. None of these. Cummulative compound. Differentical compound. Level Compound. None of these. Cummulative compound. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following is/are not a self starting motor? both 1 and 2 None of these 3-phase induction motor 1-phase induction motor both 1 and 2 None of these 3-phase induction motor 1-phase induction motor ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When Flemings right hand rule to find the direction of induced emf, the thumb points towards direction of flux. direction of motion of the conductor. direction of induced emf. opposite to the direction of motion of the conductor. direction of flux. direction of motion of the conductor. direction of induced emf. opposite to the direction of motion of the conductor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature core of the rotor bars of dc motors are laminated to reduce mechanical losses. to reduce hysteresis loss. to provide better flux linkage. to reduce eddy current loss. to reduce mechanical losses. to reduce hysteresis loss. to provide better flux linkage. to reduce eddy current loss. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as T is independent of P. T ∝ √P. T ∝ P. T2 ∝ P3. T is independent of P. T ∝ √P. T ∝ P. T2 ∝ P3. ANSWER DOWNLOAD EXAMIANS APP
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