Electrical Machines An inverted V curve of synchronous motor shows variation of power factor and supply voltage during hunting. supply voltage and excitation current at constant load. supply voltage and field current at constant excitation. power factor and DC excitation at constant load. power factor and supply voltage during hunting. supply voltage and excitation current at constant load. supply voltage and field current at constant excitation. power factor and DC excitation at constant load. 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 Khf2Bm1.6. KhfBm. KhfBm3. KhfBm1.6. Khf2Bm1.6. KhfBm. KhfBm3. KhfBm1.6. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________. 25 %. 50 %. 15 %. 10 %. 25 %. 50 %. 15 %. 10 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is 8. 1/4. 1/2. 4. 8. 1/4. 1/2. 4. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In induction motor wound rotor motor is mainly is used in application where low starting torque. power factor is less. less costly motor is not required. high starting torque. low starting torque. power factor is less. less costly motor is not required. high starting torque. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Thin laminations are used in a machine in order to reduce Eddy current losses Hysteresis losses Both 1 and 2 Copper losses Eddy current losses Hysteresis losses Both 1 and 2 Copper losses ANSWER DOWNLOAD EXAMIANS APP
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