Knowledge Test Class B

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the.. Read More

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has two, three or four possible answer choices. Test questions come from the Utah Commercial Driver License Handbook. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question
Passing Score

1. The air compressor governor controls:

Explanation
In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

2. When starting an engine, oil pressure should come up to a normal level:

Explanation
Look at your truck's gauges when starting the engine. The oil pressure in an engine should come up to a normal level within seconds of the vehicle's engine being started.

3. When conducting a vehicle inspection, you must show each of the following, except:

Explanation
When checking the oil pressure gauge as part of a vehicle inspection test, you must ensure that it is working. The gauge should show increasing or normal oil pressure, or the oil pressure warning light should turn off. If equipped with one, the oil temperature gauge should begin a gradual rise to the normal operating range.

4. If a vehicle begins to hydroplane, the driver should:

Explanation
If your vehicle begins to hydroplane, you can regain control by releasing the accelerator and pushing in the clutch.

5. A vehicle inspection:

Explanation
A vehicle should be inspected before every trip to help ensure that any small mechanical issues are caught before they become more serious problems. It is better to discover a problem with your vehicle before a drive than after the drive has begun.

6. Excessive vibration may be a sign of tire failure.

Explanation
If your vehicle thumps or vibrates heavily, it may indicate that a tire has failed. Check your tires as soon as you can safely leave the road.

7. Driving too fast:

Explanation
Driving at excessive speeds is a major cause of fatal crashes. Never drive above the posted maximum speed limit and adjust your speed to fit conditions.
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