Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is Fmax. (1/2)Fmax. (3/2)Fmax. 3Fmax. Fmax. (1/2)Fmax. (3/2)Fmax. 3Fmax. ANSWER DOWNLOAD EXAMIANS APP
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. Khf2Bm1.6. KhfBm3. KhfBm. KhfBm1.6. Khf2Bm1.6. KhfBm3. KhfBm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine, the angle between the stator and rotor fields is 90o. 0o. dependent upon the load. 180o. 90o. 0o. dependent upon the load. 180o. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines For a given torque, reducing diverter resistance of a DC series motor causes increase in speed demanding more armature current. decrease in speed demanding less armature current. decrease in speed but armature current remains the same. increase in speed but armature currnet remains the same. increase in speed demanding more armature current. decrease in speed demanding less armature current. decrease in speed but armature current remains the same. increase in speed but armature currnet remains the same. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature reaction effect is more in which of the following methods? armature resistance control field weakening method None of these same in both methods armature resistance control field weakening method None of these same in both methods ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A DC series motor has which of the following characteristics? Can be started easily without load. Has a poor torque. Has a almost constant speed. Has its field winding consinting of thick wire and less no of turns. Can be started easily without load. Has a poor torque. Has a almost constant speed. Has its field winding consinting of thick wire and less no of turns. ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS