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. decreased. remains unchanged. increased. kept constant to certain value. decreased. remains unchanged. increased. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The damper windings also called the squirrel cage windings or damper grids are provided in a synchronous motor to make it self starting. consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. both (A) and (B). are provided in a synchronous motor to make it self starting. consists of short-circuited copper bars embedded in the field pole faces. are provided on the stator for improving power factor. both (A) and (B). ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be 26.21 kW. 24.11 kW. 25 kW. 23.06 kW. 26.21 kW. 24.11 kW. 25 kW. 23.06 kW. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be 6% and -4% None of these 4.8% and -3.2% 3.2% and -1.6% 6% and -4% None of these 4.8% and -3.2% 3.2% and -1.6% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a 3-phase induction motor, torque and supply voltage are related as T ∝ V T ∝ 1/V T∝ V² T ∝ 1/V² T ∝ V T ∝ 1/V T∝ V² T ∝ 1/V² ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following motors is/are widely used? either of these squirrel cage induction motor None of these slip ring induction motor either of these squirrel cage induction motor None of these slip ring induction motor ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS