Electrical Machines If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by KhfBm1.6. KhfBm. Khf2Bm1.6. KhfBm3. KhfBm1.6. KhfBm. Khf2Bm1.6. KhfBm3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The main disadvantage(s) of the ward-Leonard system is/are all of above. poor overall efficiency. high maintenance cost. high initial cost. all of above. poor overall efficiency. high maintenance cost. high initial cost. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be 88.8%. 57.1%. 59.2%. 48.0%. 88.8%. 57.1%. 59.2%. 48.0%. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will run in a direction opposite to previous one. get damaged. continue running in the same direction as before. not run. run in a direction opposite to previous one. get damaged. continue running in the same direction as before. not run. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The field divertor resistance for a DC series motor is of order of 10 Ω 100 Ω 50 Ω 0.1 Ω 10 Ω 100 Ω 50 Ω 0.1 Ω ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as relative speed. air gap. crawling. cogging. relative speed. air gap. crawling. cogging. ANSWER DOWNLOAD EXAMIANS APP
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