Electrical Machines The torque angle, in a synchronous motor, is the angle between magnetizing electric current and back emf. None of these the supply voltage and the back emf. the rotating stator flux and rotor flux. magnetizing electric current and back emf. None of these the supply voltage and the back emf. the rotating stator flux and rotor flux. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field? Zero Synchronous speed None of these Slip speed Zero Synchronous speed None of these Slip speed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? field weakening method armature resistance control None of these same in both methods field weakening method armature resistance control None of these same in both methods ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is 1, 3, 5 1, 4, 6 1, 2, 5 1, 2, 6 1, 3, 5 1, 4, 6 1, 2, 5 1, 2, 6 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss? 1400W, 1000W 1000W , 1400W 800W, 1600W 1600W, 800W 1400W, 1000W 1000W , 1400W 800W, 1600W 1600W, 800W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The shaft of induction motor should be any of these. flexible. hollow. stiff. any of these. flexible. hollow. stiff. ANSWER DOWNLOAD EXAMIANS APP
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