Electrical Machines The shaft torque of a dc motor is less than the electromagnetic torque because of mechanical losses. ohmic losses. hysteresis losses. eddy current losses. mechanical losses. ohmic losses. hysteresis losses. eddy current losses. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will continue to work as synchronous motor with same direction of rotation. come to stand still. start working as induction motor. continue to work as alternator but the direction of rotation will reverse. continue to work as synchronous motor with same direction of rotation. come to stand still. start working as induction motor. continue to work as alternator but the direction of rotation will reverse. 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 23.06 kW. 24.11 kW. 25 kW. 26.21 kW. 23.06 kW. 24.11 kW. 25 kW. 26.21 kW. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the frequency of a alternator, if P = number of poles and N = revolution made per second? 120P / N Hz. PN / 2 Hz. 120N / P Hz. 120 / PN Hz. 120P / N Hz. PN / 2 Hz. 120N / P Hz. 120 / PN Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What are slot wedges in a DC machine made of? Cast iron. Fibre. Mild steel. Silicon steel. Cast iron. Fibre. Mild steel. Silicon steel. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A motor operates in stable region at which of the following slip? both 1 and 2 unity slip low slip region high slip region both 1 and 2 unity slip low slip region high slip region ANSWER DOWNLOAD EXAMIANS APP
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