Electrical Machines In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be PN/60. PN/120. PN/3000. PN/2. PN/60. PN/120. PN/3000. PN/2. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Poles of DC machine are often laminated to reduce armature reaction. reduce iron weight. reduce pulsation loss. dissipate more heat. reduce armature reaction. reduce iron weight. reduce pulsation loss. dissipate more heat. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When pure inductive load is connected to the alternator, what is the effect of armature reaction? Magnetization Cross magnetization Demagnetization None of these Magnetization Cross magnetization Demagnetization None of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by Kef2KfBm2. Kef2Kf2Bm2. KefKf2Bm2. Kef2Kf2Bm. Kef2KfBm2. Kef2Kf2Bm2. KefKf2Bm2. Kef2Kf2Bm. 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? 800W, 1600W 1600W, 800W 1000W , 1400W 1400W, 1000W 800W, 1600W 1600W, 800W 1000W , 1400W 1400W, 1000W ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm? -3.33% +3.33% +3% -3% -3.33% +3.33% +3% -3% ANSWER DOWNLOAD EXAMIANS APP
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