Question 533Electricity/Electronics - QMED70% to pass
What is the primary purpose of the brushes of DC generators?
AI Explanation
You are correct, the primary purpose of the brushes of DC generators is to conduct armature current to an external load (option A).
The brushes in a DC generator make contact with the commutator, which converts the alternating current (AC) generated in the armature windings into direct current (DC) that can be supplied to an external load. The brushes act as the conduit to transfer this DC current from the rotating armature to the stationary external circuit.
The other options are incorrect because: B) the field windings, not the brushes, provide the excitation to a DC generator; C) the commutator, not the brushes, neutralizes armature reaction; and D) the brushes do not convert DC to AC, they convert AC to DC.
Related Questions
#531 Which of the following components are used to convert alternating current produced in the DC generator armature windings to direct current? #532 As shown in the illustrated DC machine which is configured as a generator, what type of machine is illustrated in terms of the configuration of the windings? Illustration EL-0052 #534 In a shunt-wound DC generator, with what generator component are the shunt field windings connected in parallel with? #535 A variable shunt, connected across the series field coils of a DC compound wound generator, permits adjustment of the degree of compounding. What is this variable shunt called? #536 As shown in the illustration, which brush holder is of the reaction type? Illustration EL-0029