✓ TradeExamPro

TradeExamPro › CDL & Driving › CDL general knowledge, air brakes, combination

General knowledge practice questions

80 questions from the cdl general knowledge, air brakes, combination practice test.

Beta. These questions are new and are being checked by licensed tradespeople. If one looks wrong, use “Report this question” and we will fix it.

General knowledge practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

A truck whose electrical circuits are protected by fuses must carry which set of emergency equipment?

  1. Spare fuses, a first-aid kit and one reflective warning triangle
  2. A fire extinguisher, a spare tire and a set of jumper cables
  3. Three reflective triangles, tire chains and a tow strap or chain
  4. Spare fuses, three reflective triangles and a fire extinguisher
Show the answer

D. Spare fuses, three reflective triangles and a fire extinguisher

The required items are spare electrical fuses (unless the vehicle uses circuit breakers), warning devices for a parked vehicle such as three reflective triangles, and a properly charged and rated fire extinguisher. A first-aid kit, spare tire or chains may be useful but are not the required set.

Reference: CDL Manual Section 2.1, Vehicle Inspection; 49 CFR 393.95

Steering wheel free play is a defect when it exceeds about how many degrees?

  1. 5 degrees
  2. 10 degrees
  3. 20 degrees
  4. 30 degrees
Show the answer

B. 10 degrees

More than 10 degrees of play, roughly 2 inches of movement at the rim of a 20-inch steering wheel, can make the vehicle hard to steer. Waiting until play reaches 20 or 30 degrees leaves far too much looseness in the system.

Reference: CDL Manual Section 2.1, Vehicle Inspection

On your walkaround you notice streaks of rust running outward from several lug nuts on one wheel. What does this most likely mean?

  1. The lug nuts may be loose
  2. The tire is overinflated
  3. The wheel was painted recently
  4. The hub has too much oil
Show the answer

A. The lug nuts may be loose

Rust trails around wheel nuts are a sign the nuts have been working loose, so their tightness must be checked. An overfilled or leaking hub shows up as oil or grease on the wheel, not rust around the nuts.

Reference: CDL Manual Section 2.1, Vehicle Inspection

Other topics