Electrical Machines A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be about 50 V. about 2 V. zero. 220 V. about 50 V. about 2 V. zero. 220 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is 1, 2, 5 2, 3, 4 1, 3, 5 1, 2, 3, 4 1, 2, 5 2, 3, 4 1, 3, 5 1, 2, 3, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Maximum power will be developed when back emf is equal to supply voltage. double the supply voltage. half of the supply voltage. All of these equal to supply voltage. double the supply voltage. half of the supply voltage. All of these ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000. 10 volts. 40 volts. 20 volts. 30 volts. 10 volts. 40 volts. 20 volts. 30 volts. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The squirrel cage induction motors are provided with blades in order to none of these. eliminate noise. facilitate cooling of rotor. balance the rotor dynamically. none of these. eliminate noise. facilitate cooling of rotor. balance the rotor dynamically. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a dc machine, the demagnetizing effect of armature reaction is due to uneven air-gap length non-sinusoidal nature of armature mmf magnetic saturation in half of the field pole component of armature mmf along field axis uneven air-gap length non-sinusoidal nature of armature mmf magnetic saturation in half of the field pole component of armature mmf along field axis ANSWER DOWNLOAD EXAMIANS APP
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