Electrical (A6)Câu 75 / 120
Excessive AC ripple voltage measured at the battery with the engine running usually indicates:
a.One or more failed alternator diodes
b.A weak starter
c.A blown headlight bulb
d.A stuck thermostat
Giải thích
Failed rectifier diodes let AC leak through, producing measurable ripple and reduced DC output. A meter set to AC volts or an oscilloscope reveals it. This often causes charging complaints and can disturb electronic modules.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- In a wiring diagram, a component shown connected to ground provides:
- Technician A says a fuse that blows again immediately after replacement indicates a short to ground or an overload. Technician B says repeatedly replacing the fuse will fix the circuit. Who is correct?
- Technician A says a diode allows current to flow in only one direction. Technician B says alternators use diodes to rectify AC into DC. Who is correct?
- Technician A says a relay lets a small control current switch a larger load. Technician B says relays protect switches and allow smaller control wiring. Who is correct?
- Dim headlights that brighten when engine rpm increases most likely indicate:
- A voltmeter is connected how, relative to the component being tested?
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