CH.15 ASE

1.Technician A says that today, the average 12-volt electrical system for a late-model highway tractor add up to 150 amps at peak with an 84-amp average. Technician B says that both DC generators and alternators produce electricity by relative movement of conductors in a magnetic field. Who is correct?

2.Technician A says that alternators have more moving parts as compared to generators. Technician B says that alternators can produce power at engine idle speeds; generators cannot. Who is correct?

3.Technician A says that the two most important parts in an alternator used to produce electrical current are the rotor and stator winding. Technician B says that the rotor contains a spinning electromagnet that induces current flow in the stator winding, which is made up of numerous coils of wire. Who is correct?

4.Technician A says that the rotor is a rotating electromagnet that provides the magnetic field to induce voltage and current in the stator. Technician B says that the direct-gear drive mechanism is used in most cases but that a pulley drive may also be employed. Who is correct?

5.Technician A says that regulated current to the alternator rotor is supplied through a pair of graphite brushes sliding against slip rings on the rotor shaft. Technician B says that heavy-duty springs help the brushes maintain contact with the slip rings. Who is correct?

6.Technician A says that vehicles fitted with self-exciting alternators may require the engine rpm to be briefly increased after every start-up to initiate charging. Technician B says that using self-exciting alternators eliminates the need for a separate circuit from the key switch to the alternator and simplifies chassis wiring. Who is correct?

7.Technician A says that the stator is mounted between two end housings, and it holds the stator windings stationary so that the rotating magnetic field cuts through the stator windings, inducing an electric current in the windings. Technician B says that to smooth the pulsating current flow, there are three distinct layers of windings offset 60 degrees in each layer from one another. Who is correct?

8.Technician A says that stators are normally serviced in a repair facility. Technician B says that stators can be visually checked during rebuilding for burnt, cut, or nicked winding laminations. Who is correct?

9.Technician A says that alternators produce alternating current, which is acceptable for operating many electrical devices. Technician B says that converting the Ac current to usable DC current is referred to as modulation. Who is correct?

10.Technician A says that voltage regulators are first classified as either external or internal. Technician B says that the majority of late-model alternators have external regulators. Who is correct?