DMV

Vehicle Systems Practice Questions

5 free sample cdl questions about vehicle systems, with the correct answer, a full explanation, and a source reference for each. Want to test yourself instead of just reading the answers? Find your state's free practice test.

easy

1. Why should a driver check the vehicle’s battery and electrical connections during an inspection?

AElectrical issues generally only affect comfort features like the radio
BThe electrical system has no real connection to required safety equipment
CElectrical connections rarely need checking once a vehicle is a year old
DA weak battery or loose connection can cause lights, gauges, or the engine to fail
easy

2. Why should a driver check coolant level and hose condition during an inspection?

ALow coolant or a damaged hose can lead to engine overheating and a breakdown
BCoolant level mainly affects how quickly the cabin heater warms up
CHoses are only checked during scheduled shop maintenance, not daily inspections
DEngine overheating is a comfort issue rather than a genuine safety one
medium

3. Why is checking the exhaust system for leaks part of a pre-trip inspection?

AExhaust leaks generally only affect fuel economy, not driver safety
BA leak can allow dangerous exhaust fumes, including carbon monoxide, into the cab
CExhaust system condition has no real bearing on passing an inspection
DExhaust leaks are a concern only in vehicles over ten years old
medium

4. Why should a driver check the suspension system (springs, mounts, and related parts) during an inspection?

ASuspension mainly affects ride comfort, not actual vehicle control
BSuspension components rarely fail and don’t need routine checking
CWorn or broken suspension components can affect vehicle control and handling
DSuspension issues only matter when the vehicle is completely empty
easy

5. Why does a thorough pre-trip inspection cover multiple separate systems (brakes, tires, lights, coupling, and more) rather than just one?

ACovering multiple systems is mainly a company policy, not a safety necessity
BFederal rules technically only require checking the braking system
CChecking multiple systems only really matters for older vehicles
DA problem in any one system can independently create a serious safety hazard