Electrical Machines In DC generators, the residual magnetism is of the order of 2.5 %. 10 %. 20 %. 15 %. 2.5 %. 10 %. 20 %. 15 %. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated) changes to three times the original value changes to 1.5 times the original value remain the same as the original changes to 0.5 times the original value changes to three times the original value changes to 1.5 times the original value remain the same as the original changes to 0.5 times the original value ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines If the back emf in DC motor vanishes suddenly the motor will start haunting. run at very high speed. burn. run at very low speed. start haunting. run at very high speed. burn. run at very low speed. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines What is the function of inter pole in DC generator? Both option B and C. To neutralize the distortion of main field flux due to armature reaction. To serve the economical aspects. To get a superior commutation. Both option B and C. To neutralize the distortion of main field flux due to armature reaction. To serve the economical aspects. To get a superior commutation. 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. None of these. Heavy sparking at brushes. Both of above. Heavy sparking at the first stud of starting resistance steps. None of these. Heavy sparking at brushes. ANSWER DOWNLOAD EXAMIANS APP
Electrical Machines Which of the following induction motor has maximum speed? 4 pole. 8 pole. 6 pole. 2 pole. 4 pole. 8 pole. 6 pole. 2 pole. ANSWER DOWNLOAD EXAMIANS APP
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