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 KhfBm. Khf2Bm1.6. KhfBm1.6. KhfBm3. KhfBm. Khf2Bm1.6. KhfBm1.6. KhfBm3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that both Eb and Td are zero Eb is zero, but Td is unchanged Eb is unchanged, but Td is zero both Eb and Td are unchanged both Eb and Td are zero Eb is zero, but Td is unchanged Eb is unchanged, but Td is zero both Eb and Td are unchanged ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________. 1.5 %. 30 %. 2.67 %. 5 %. 1.5 %. 30 %. 2.67 %. 5 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hysteresis loss is proportional to f. f3. f2. f1.5. f. f3. f2. f1.5. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The use of higher flux density in the transformer design reduces the weigh per KVA None of these has no relation with the weight of transformer increases the weigh per KVA reduces the weigh per KVA None of these has no relation with the weight of transformer increases the weigh per KVA ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Under commutation results in sparking the trailing edge of the brush. sparking at the middle of the brush. no sparking. sparking at the leading edge of the brush. sparking the trailing edge of the brush. sparking at the middle of the brush. no sparking. sparking at the leading edge of the brush. ANSWER DOWNLOAD EXAMIANS APP
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