Question

The speed of the generator at which its output voltage just rises above the voltage of the battery being charged is called ............... speed.

• A. over
• B. abnormal
• C. cutting out
• D. cutting in

Hint:

Tip: Generator starts charging = cutting in speed!

Answer 1

The Correct Option is D

In a DC generator charging system, the generator must reach a certain speed for its output voltage to exceed the battery voltage.
This speed is called the cutting in speed.
Below this speed, the generator does not supply current because its output voltage is too low.
Once the generator reaches the cutting in speed, it begins to deliver current to charge the battery.
This prevents reverse current flow from the battery back into the generator when it is turning too slowly.
“Cutting out” refers to the reverse process — when the generator stops supplying current if its speed drops too low.
Therefore, the correct answer is cutting in.