DMV CDL Practice Test 1 - Tanker

1 / 20

Hauling liquids in tankers requires special care for two reasons. One reason is the _____ center of gravity that tankers have.

A. High

B. Flat

C. Wide

Hauling liquids in tanks requires special skills because of the high center of gravity and liquid movement.

2 / 20

You are driving a tank truck and the front wheels begin to skid. Which of these is most likely to occur?

A. The truck will roll over

B. You will continue in a straight line and keep moving forward no matter how much you steer

C. Liquid surge will pull the tank from the truck

In a front-wheel skid, the front end tends to go in a straight line regardless of how much you turn the steering wheel.

3 / 20

How far back does a helper stand when pumping or unloading liquids from a tanker?

A. 25 feet

B. 20 feet

C. 15 feet

The person watching the loading or unloading must: be alert, have a clear view of the cargo tank, be within 25 feet of the tank, know of the hazards of the materials involved, know the procedures to follow in an emergency, and be authorized to move the cargo tank and able to do so.

4 / 20

Outage means:

A. Allowance for expansion of liquid

B. Liquid weight

C. How fast the tanks drain

Liquids expand as they warm and you must leave room for the expanding liquid. This is called "outage."

5 / 20

Side to side surge can cause:

A. Over speeding

B. Suspension system failure

C. Roll over

Side-to-side surge can cause a roll over.

6 / 20

You need to be extremely cautious when driving smooth bore tankers. This is especially true when you are:

A. Starting or stopping

B. Hauling milk or other food products

C. Loading or unloading

Un-baffled liquid tankers (sometimes called "smooth bore" tanks) have nothing inside to slow down the flow of the liquid. Therefore, forward-and back surge is very strong.

7 / 20

Liquid in a tank with baffles can have what kind of surge?

A. Top to bottom

B. Front to back

C. Side to side

The baffles help to control the forward and backward liquid surge. Side-to-side surge can still occur. This can cause a roll over.

8 / 20

When your cargo tank has baffles, what handling effect do you expect?

A. There will be less side to side surge than there is in tanks without baffles

B. There will be slower surge that quick surge

C. There will be less front to back surge than there is in tanks without baffles

The baffles help to control the forward and backward liquid surge. Side-to-side surge can still occur. This can cause a roll over.

9 / 20

Which of these statements about stopping distance and speed is true?

A. Wet roads can double stopping distance at any speed

B. All answers are true

C. You need about two times as much stopping distance at 40 MPH as at 20 MPH

Remember that wet roads double the normal stopping distance.

10 / 20

Which of these statements about tankers and their center of gravity is true?

A. Tankers can turn over at the speed limits posted for curves

B. Both of the above

C. Much of the load's weight is carried high up off the road

High center of gravity means that much of the load's weight is carried high up off the road. This makes the vehicle top-heavy and easy to roll over. Liquid tankers are especially easy to roll over. Tests have shown that tankers can turn over at the speed limits posted for curves. Take highway curves and on ramp/off ramp curves well below the posted speeds

11 / 20

You must have a tank vehicle (N) endorsement to drive a vehicle with

A. individual tanks over 65 gallons or a total of at least 500 gallons

B. individual tanks over 119 gallons or a total of at least 1,000 gallons

C. individual tanks over 225 gallons or a total of at least 2,400 gallons

A tank endorsement is required if your vehicle needs a Class A or B CDL and you want to haul a liquid or liquid gas in a tank or tanks having an individual rated capacity of more than 119 gallons and an aggregate rated capacity of 1000 gallons or more that is either permanently or temporarily attached to the vehicle or the chassis.

12 / 20

When should you inspect a tank vehicle?

A. Before loading it or driving it

B. Before driving it

C. Before loading it, driving it, or unloading it

You should inspect a tank vehicle before loading it, driving it, or unloading it. This is to ensure that it is safe to carry out these activities and the vehicle can safely hold its liquid or gas contents.

13 / 20

To control surge, what is the best way to brake?

A. Keep a steady foot on the brake and don't release the brake too soon

B. Brake quickly to slow down and then brake quickly again to come to a full stop

C. Brake firmly

Keep a steady pressure on the brakes. Do not release too soon when coming to a stop. Brake far in advance of a stop and increase your following distance.

14 / 20

When must a tank be un-baffled?

A. If the liquid is likely to expand a lot

B. If it has to stay very clean

C. If the liquid is very dense

Un-baffled liquid tankers sometimes called "smooth bore" tanks have nothing inside to slow down the flow of the liquid. Un-baffled tanks are usually those that transport food products like milk. Sanitation regulations forbid the use of baffles because of the difficulty in cleaning the inside of the tank.

15 / 20

Which of these is the most important thing to remember about emergency braking?

A. Disconnecting the steering axle brakes will help keep your vehicle in a straight line

B. If the wheels are skidding, you cannot control the vehicle

C. Never do it without downshifting first

If the wheels are skidding, you cannot control the vehicle.

16 / 20

If you must make an emergency stop, brake so that

A. you can use the parking brake before the brake pedal

B. your vehicle will stay in a straight line

C. you'll definitely lock the brakes

You should brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary. You can use the "controlled braking" method or the "stab braking" method.

17 / 20

If your vehicle has any of the following equipment, what needs to work properly?

A. All of the above

B. Grounding and bonding cables

C. Emergency shut-off systems

D. Vapor recovery kits

If your vehicle has any of the following equipment, make sure it works: vapor recovery kits, grounding and bonding cables, emergency shut-off systems, or built in fire extinguisher.

18 / 20

If a hill or curve keeps drivers behind you from seeing the vehicle within 500 feet:

A. The vehicles taillights should be kept on warning other drivers

B. the rear reflective triangle should be moved back down the road to give adequate warning

C. You do not need to put out reflective triangles unless the vehicle will be stopped for 30 minutes or more

If line of sight view is obstructed due to hill or curve, move the rear-most triangle to a point back down the road so warning is provided up to 500 feet.

19 / 20

When you load the small tanks of a cargo tank equipped with bulkheads, you should check your:

A. Water content

B. Weight distribution

C. Air to fuel ratio

Some liquid tanks are divided into several smaller tanks by bulkheads. When loading and unloading the smaller tanks, the driver must pay attention to weight distribution. Don't put too much weight on the front or rear of the vehicle.

20 / 20

When you unload the smaller tanks of a tank with bulk heads, be careful to check the:

A. Air to fuel ratio

B. Distribution of weight

C. Water content

When loading and unloading the smaller tanks, the driver must pay attention to weight distribution. Don't put too much weight on the front or rear of the vehicle.

Mississippi's CDL Practice Test 1