Electrical Machines For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be 375 rpm 75 rpm 1500 rpm 3000 rpm 375 rpm 75 rpm 1500 rpm 3000 rpm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be 30 W. 25 W. 28 W. 36 W. 30 W. 25 W. 28 W. 36 W. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The speed of a DC series motor is Inversely proportional to the armature current. Proportional to the square of the armature current. Proportional to field current. Proportional to the armature current. Inversely proportional to the armature current. Proportional to the square of the armature current. Proportional to field current. Proportional to the armature current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When an electric train is moving down a hill, the DC motor will operate as DC series generator. DC shunt motor. DC series motor. DC shunt generator. DC series generator. DC shunt motor. DC series motor. DC shunt generator. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:- 2 and 4. 2, 3 and 4. 1, 3 and 4. 1, 2 and 3. 2 and 4. 2, 3 and 4. 1, 3 and 4. 1, 2 and 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is 2, 3 2, 4 1, 4 1, 3 2, 3 2, 4 1, 4 1, 3 ANSWER DOWNLOAD EXAMIANS APP
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