Electrical (A6)Câu 77 / 120
Dim headlights that brighten when engine rpm increases most likely indicate:
a.A blown fuse
b.A shorted headlight switch
c.A weak battery or undercharging condition
d.An open ground on one lamp
Giải thích
Lights that brighten with rpm suggest the charging system is barely keeping up, so a weak battery or low alternator output is likely. A charging system test measures output under load. A high-resistance connection can also dim lights but usually affects specific circuits.
Luyện miễn phí toàn bộ 120 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- Excessive AC ripple voltage measured at the battery with the engine running usually indicates:
- 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?
- A voltmeter is connected how, relative to the component being tested?
- The gauge or module that displays engine coolant temperature relies on a sensor whose resistance:
- A circuit has 12 volts applied and draws 2 amps. Its total resistance is:
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