Electrical Machines Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is 600 rpm. 500 rpm. 3000 rpm. 3600 rpm. 600 rpm. 500 rpm. 3000 rpm. 3600 rpm. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of Both of above. Heavy sparking at the first stud of starting resistance steps. Heavy sparking at brushes. None of these. Both of above. Heavy sparking at the first stud of starting resistance steps. Heavy sparking at brushes. None of these. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be PN/60. PN/3000. PN/2. PN/120. PN/60. PN/3000. PN/2. PN/120. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In DC machine shape of armature MMF wave is? Triangular and directed towards main pole. Peaky in nature. Saddle shape. Triangular and directed towards brush axis. Triangular and directed towards main pole. Peaky in nature. Saddle shape. Triangular and directed towards brush axis. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will Reduce. Remain unaltered. Oscillate around the normal speed. Increase. Reduce. Remain unaltered. Oscillate around the normal speed. Increase. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as 2 to 3. 1.0. 3 to 5. 1.5 to 2. 2 to 3. 1.0. 3 to 5. 1.5 to 2. ANSWER DOWNLOAD EXAMIANS APP
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