Electrical Machines The output voltage of a DC generator is E = V + Ra. E = V + Ia. E = V + IaRa. E = V – IaRa. E = V + Ra. E = V + Ia. E = V + IaRa. E = V – IaRa. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ? ωe = 1/2*ωm ωe = 4*ωm ωe = ωm ωe = 2*ωm ωe = 1/2*ωm ωe = 4*ωm ωe = ωm ωe = 2*ωm ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, the armature windings are placed on the rotor because of the necessity for commutation electromechanical energy conversion generation of voltage development of torque commutation electromechanical energy conversion generation of voltage development of torque ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines An inverted V curve of synchronous motor shows variation of power factor and supply voltage during hunting. power factor and DC excitation at constant load. supply voltage and field current at constant excitation. supply voltage and excitation current at constant load. power factor and supply voltage during hunting. power factor and DC excitation at constant load. supply voltage and field current at constant excitation. supply voltage and excitation current at constant load. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be, 12. 7. 4. 3. 12. 7. 4. 3. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is 2% 5% 4% 25% 2% 5% 4% 25% ANSWER DOWNLOAD EXAMIANS APP
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