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Question:

When is it safe to remove the radiator cap?

Answer: When the cap is cool enough to touch with a bare hand

Explanation
Don't take any chances with your radiator cap. If you open it while it is still hot you can receive a blast of steam which can cause serious injury.
This question is in Section 1: General Knowledge of our CDL Test Guide. Explore now!
Related Question

Question: Which of the following is true about over-width, over-length, or over-weight loads?

Such a load requires a special transit permit.

With a load that is oversized in any way, you must have a special permit. You may also be restricted as to when you can drive with such a load, and a pilot vehicle or police escort may be required, but only the special permit is required regardless.

Question: During which of the following situations should you have your emergency four-way flashing lights on?

Parked by side of road

If you are parked by the side of the road during an emergency, it is essential that you use your four-way emergency flashers, as individuals who see just your regular taillights, especially at night, may assume that you are moving normally and crash into the back of your vehicle.

Question: You must keep the papers about hauling hazardous materials:

In the pouch of the driver door.

Question: The parking brake should be tested while the vehicle is

moving forward slowly.

Question: If your truck has a properly functioning dual air brake system and minimum size air tanks, the air pressure should build up from 85 to 100 psi within how many seconds?

45.

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