Electrical Machines A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be 2.781 Ω. 2.241 Ω. 25.564 Ω. 2.74 Ω. 2.781 Ω. 2.241 Ω. 25.564 Ω. 2.74 Ω. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then I1 = KI2. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iw. I1 = KI2 + Iμ. I1 = KI2. I1 = KI2 + Iw + Iμ.ok I1 = KI2 + Iw. I1 = KI2 + Iμ. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a seperately excited DC Motor if field current is increased, it will Reduce armature heating. Increase speed Reduce starting torque. Increase acceleration duration. Reduce armature heating. Increase speed Reduce starting torque. Increase acceleration duration. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature coil is short circuited by brushes when it lies in none of above positions. along field axis. along neutral axis. in any of above positions. in none of above positions. along field axis. along neutral axis. in any of above positions. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Armature of DC machine is made of insulating material. non-ferrous material. silicon steel. conducting material. insulating material. non-ferrous material. silicon steel. conducting material. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC generators, the cause of rapid brush wear may be any of above. imperfect contact. rough commutator surface. severe sparking. any of above. imperfect contact. rough commutator surface. severe sparking. ANSWER DOWNLOAD EXAMIANS APP
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