Electrical Machines If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is (1/2)Fmax. 3Fmax. (3/2)Fmax. Fmax. (1/2)Fmax. 3Fmax. (3/2)Fmax. Fmax. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The residual magnetism of a self-excited dc generator is lost. To build up its emf again the field winding must be replaced the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding connection must be reversed the field winding must be replaced the armature connection must be reversed field winding must be excited by low voltage dc supply the field winding connection must be reversed ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines which of the following losses are negligible in blocked rotor test? mechanical loss iron loss both A and B copper loss mechanical loss iron loss both A and B copper loss ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The slip of an induction motor during DC rheostatic braking is 1 - s. 2 - s. s. 2 + s. 1 - s. 2 - s. s. 2 + s. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Hunting in a synchronous cannot be due to windage friction. variable frequency. variable load. variable supply voltage. windage friction. variable frequency. variable load. variable supply voltage. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then E ∝ φf E ∝ 1/(φf) E ∝ f/φ E ∝ φ/f E ∝ φf E ∝ 1/(φf) E ∝ f/φ E ∝ φ/f ANSWER DOWNLOAD EXAMIANS APP
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