Electrical Machines A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be 2 Ω. 10 Ω. 4 Ω. 8 Ω. 2 Ω. 10 Ω. 4 Ω. 8 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 4% 5% 25% 2% 4% 5% 25% 2% ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be 53+j85 ohms 3.5+j5.8 ohms 8+j13 ohms 3.05+j5.08 ohms 53+j85 ohms 3.5+j5.8 ohms 8+j13 ohms 3.05+j5.08 ohms ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In an auto-transformer, power is transferred through None of these conduction process only. induction process only. both A and B. None of these conduction process only. induction process only. both A and B. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When two DC series motors are connected in parallel, the resultant speed is zero. normal speed. less than normal speed. more than normal speed. zero. normal speed. less than normal speed. more than normal speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will happen if the the supply terminals are reversed in case of a DC shunt motor? The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run in reverse direction. The motor will run much faster in the same direction. The motor will run at its normal speed in the same direction as before. The motor will stop. The motor will run in reverse direction. The motor will run much faster in the same direction. ANSWER DOWNLOAD EXAMIANS APP
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