CDL Tanker Practice Test 3

Question 1

What endorsement is required to operate a commercial tank vehicle?

Accepted Answer

N (tanker) endorsement

Answer

The N endorsement is required to drive vehicles designed to haul liquids or gases in bulk.

Question 2

If you are hauling hazardous materials in a tanker, what additional endorsement do you need?

Accepted Answer

X (combined HazMat and tanker)

Answer

An X endorsement combines HazMat and tanker authority for hauling hazardous liquids or gases in bulk.

Question 3

When loading a tanker, how should you distribute the weight?

Accepted Answer

Pay attention to legal axle weight limits

Answer

You must check that the load does not exceed legal weight limits on any individual axle.

Question 4

Why must you check the manhole covers and vents before driving a tanker?

Accepted Answer

To make sure they are closed and not leaking

Answer

Leaking manhole covers or vents can spill product and create hazards, so they must be secure before driving.

Question 5

What special problem do tankers face when stopping in an emergency?

Accepted Answer

Liquid surge can push the truck after the brakes are applied

Answer

Even after braking, surging liquid can keep pushing the tanker forward, extending the stopping action.

CDL Practice Test