Electrical Machines Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is 600 rpm. 3000 rpm. 3600 rpm. 500 rpm. 600 rpm. 3000 rpm. 3600 rpm. 500 rpm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the mechanical power developed by a DC series motor is maximum? None of above. Back emf is equal to applied voltage. Back emf is equal to zero. Back emf is equal to half the applied voltage. None of above. Back emf is equal to applied voltage. Back emf is equal to zero. Back emf is equal to half the applied voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is 20 V. 40 V. 60 V. 0 V. 20 V. 40 V. 60 V. 0 V. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the mechanical angle α between the stator and rotor poles increases, then the stator current None of above. Increases. Remains unchanged. Decreases. None of above. Increases. Remains unchanged. Decreases. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In alternator, the rotary part is core. magnetic field poles. none of these. armature. core. magnetic field poles. none of these. armature. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines When flux density is constant in a transformer, hysteresis loss varies as V f V² f² V f V² f² ANSWER DOWNLOAD EXAMIANS APP
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