Question 423Electricity/Electronics - QMED70% to pass
How can the loss of residual magnetism in an alternator or generator be corrected?
AI Explanation
The correct answer is D) using a storage battery or battery charger to 'flash' the field.
The loss of residual magnetism in an alternator or generator can be corrected by "flashing the field" using a storage battery or battery charger. This process restores the magnetic field in the rotor, allowing the generator to build up voltage and resume normal operation. The other options are incorrect because: A) running the generator at normal speed with the field rheostat fully counter-clockwise would not restore the magnetic field; B) allowing the generator to run at 10% of normal speed for 5 minutes is an ineffective method; and C) running the rotor in the opposite direction for 5 minutes would not properly restore the magnetism.
Related Questions
#421 What may be the cause of an AC generator to fail to produce a voltage? #422 If a shipboard AC generator experiences a failure to produce a voltage, what may be the cause? #424 An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and making specific observations. What should be checked for? #425 If coil 'R1-R2-R3' on the transmitter in figure "C" shown in the illustration is turned 30 degrees clockwise, how will the corresponding coils 'R1-R2-R3' on the receivers (indicators) respond? Illustration EL-0092 #426 In actual applications, electrical connections associated with 'R1, R2 and R3' of the transmitter to 'R1, R2, and R3' of the indicators shown in figure "C" of the illustration are made by what means? Illustration EL-0092