Question

The DC charging system offers ............... voltage output, particularly at low speeds or idle speeds of engine.

• A. limited
• B. unlimited
• C. constant
• D. low

Hint:

Tip: Low RPM = limited charging → why idling long with lights on drains battery!

Answer 1

The Correct Option is A

A DC charging system uses a generator or alternator to supply power to the vehicle’s battery and electrical systems.
At higher engine speeds, the system produces enough voltage to keep the battery charged and power all accessories.
However, at low or idle speeds, the generator’s output decreases because it depends on engine RPM.
This means the voltage output is limited and may not be sufficient to cover all electrical loads continuously at low speeds.
This is why battery charging is less effective at idle compared to when the engine runs faster.
The output is not unlimited and is not constant at all speeds.
Therefore, the correct answer is limited.