2026 Iowa DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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The best way to recognize that your trailer has started to skid is by:
1. Seeing other drivers' faces.
2. Checking the trailer in your mirrors.
3. Feeling the trailer move.
1. Seeing other drivers' faces.
2. Checking the trailer in your mirrors.
3. Feeling the trailer move.
Checking the trailer in your mirrors.
When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
1. The Anti-Lock Braking System
2. The emergency braking system
3. The trailer service brakes
1. The Anti-Lock Braking System
2. The emergency braking system
3. The trailer service brakes
The trailer service brakes
The trailer hand valve:
1. Should always be used for parking.
2. Should only be used for parking on a downgrade.
3. Should never be used for parking.
1. Should always be used for parking.
2. Should only be used for parking on a downgrade.
3. Should never be used for parking.
Should never be used for parking.
During a trip, the ____ should be open.
1. Rear service line shut-off valve
2. Rear supply line shut-off valve
3. Inner shut-off valves
1. Rear service line shut-off valve
2. Rear supply line shut-off valve
3. Inner shut-off valves
Inner shut-off valves
A trailer that is too high:
1. May not couple correctly.
2. Will couple securely.
3. Is not an issue.
1. May not couple correctly.
2. Will couple securely.
3. Is not an issue.
May not couple correctly.
Combination vehicles:
1. Often have taller trailers than single commercial vehicles.
2. Are usually lighter than single commercial vehicles.
3. Require more skill to drive than single commercial vehicles.
1. Often have taller trailers than single commercial vehicles.
2. Are usually lighter than single commercial vehicles.
3. Require more skill to drive than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
To help prevent a rollover, cargo should be:
1. Placed as high as possible inside a trailer.
2. Placed as low as possible inside a trailer.
3. Placed on the driver’s side of a trailer.
1. Placed as high as possible inside a trailer.
2. Placed as low as possible inside a trailer.
3. Placed on the driver’s side of a trailer.
Placed as low as possible inside a trailer.
If you must cross traffic while driving a combination vehicle, you should:
1. Assume other drivers will make room for your vehicle.
2. Wait for a gap large enough for your vehicle to safely cross.
3. Rely only on your mirrors.
1. Assume other drivers will make room for your vehicle.
2. Wait for a gap large enough for your vehicle to safely cross.
3. Rely only on your mirrors.
Wait for a gap large enough for your vehicle to safely cross.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
The trailer will not have brakes.
Keeping cargo centered on a rig can:
1. Help you drive faster.
2. Prevent a rollover.
3. Make turns more dangerous.
1. Help you drive faster.
2. Prevent a rollover.
3. Make turns more dangerous.
Prevent a rollover.
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