Electrical Machines The coil spam must be exactly equal to people pitch. none of above. can never be equal to pole pitch. may or may not be exactly equal to people pitch. must be exactly equal to people pitch. none of above. can never be equal to pole pitch. may or may not be exactly equal to people pitch. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines The direction of generated emf in the armature coil of a DC machine is 1. the same as that of the current in a generator 2. the same as that of the current in a motor 3. opposite to that of the current in a generator 4. opposite to that of the current in a motor From these, the correct answer is 2, 3 1, 3 2, 4 1, 4 2, 3 1, 3 2, 4 1, 4 ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause less heating of the rotor. all of these. less heating of the rotor. negative sequence current. less heating of the rotor. all of these. less heating of the rotor. negative sequence current. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the frequency of a alternator, if P = number of poles and N = revolution made per second? 120P / N Hz. PN / 2 Hz. 120 / PN Hz. 120N / P Hz. 120P / N Hz. PN / 2 Hz. 120 / PN Hz. 120N / P Hz. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will shift forward by more than 90° shift forward by less than 90° shift forward by 90° coincide with the GNA shift forward by more than 90° shift forward by less than 90° shift forward by 90° coincide with the GNA ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines which of the following losses are negligible in blocked rotor test? iron loss both A and B copper loss mechanical loss iron loss both A and B copper loss mechanical loss ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS