Electrical Machines If the back emf in DC motor vanishes suddenly the motor will burn. run at very high speed. start haunting. run at very low speed. burn. run at very high speed. start haunting. run at very low speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be R2 = s2X2. sR2 = X2. R2 = s2X2. R2 = sX2. R2 = s2X2. sR2 = X2. R2 = s2X2. R2 = sX2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage 150 V. 223.V. 300 V. 200 V. 150 V. 223.V. 300 V. 200 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The volt-ampere euation for a long-shunt compound motor is given by Vt = Ea + Ia(ra + rs) Vt = Ea + Iara+ ILrs Vt= Ea– Iara Vt= Ea + Iara Vt = Ea + Ia(ra + rs) Vt = Ea + Iara+ ILrs Vt= Ea– Iara Vt= Ea + Iara ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Brushes are always placed on--------------- , in order to achieve sparkles commutation? None of these either GNA or MNA MNA GNA None of these either GNA or MNA MNA GNA ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of these types of motor is self starting? None of these. Poly-phase induction motor. Single phase induction motor. Poly-phase synchronous machine. None of these. Poly-phase induction motor. Single phase induction motor. Poly-phase synchronous machine. ANSWER DOWNLOAD EXAMIANS APP
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