Electrical Machines If the excitation is critical, the power factor of the alternator is unity power factor. leading power factor. None of these lagging power factor. unity power factor. leading power factor. None of these lagging power factor. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The back emf produced in a dc motor depends on P and Z. none of these. Z. P. P and Z. none of these. Z. P. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the mechanical angle α between the stator and rotor poles increases, then the stator current Decreases. Remains unchanged. Increases. None of above. Decreases. Remains unchanged. Increases. None of above. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is 3Fmax. (3/2)Fmax. Fmax. (1/2)Fmax. 3Fmax. (3/2)Fmax. Fmax. (1/2)Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator? Can not be determined. Mechanical power. Armature current. Induced emf. Can not be determined. Mechanical power. Armature current. Induced emf. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the flux of DC motor approaches zero, its speed will between zero and infinity. aprroach infinity. approach zero. remain unchanged. between zero and infinity. aprroach infinity. approach zero. remain unchanged. ANSWER DOWNLOAD EXAMIANS APP
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