Missouri CDL Permit Test (MO) Online Simulator

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Sample Missouri CDL Test Questions - General Knowledge

Question 1

Which procedure checks hydraulic brakes for a possible leak or pressure loss?

  1. A Assume hydraulic brakes cannot leak
  2. B Drive slowly and check only whether the vehicle stops
  3. C With the vehicle secured, pump the pedal three times and hold firm pressure for five seconds
  4. D Press the brake and accelerator pedals together

Correct answer: C – With the vehicle secured, pump the pedal three times and hold firm pressure for five seconds

The Missouri CDL inspection procedure calls for pumping the brake pedal three times and then holding it down for five seconds. After the initial application, the pedal should remain firm and should not continue moving downward. Hydraulic systems vary, so the ignition or engine procedure must follow the specifications for the vehicle being inspected.

Source: Missouri Commercial Driver License Manual — § 11M, “Hydraulic Brake Check (Hydraulic Brake Equipped Vehicles Only)”

Question 2

How far ahead should a commercial driver normally scan while driving?

  1. A 10 to 12 seconds
  2. B 8 to 10 seconds
  3. C 12 to 15 seconds
  4. D 15 to 17 seconds

Correct answer: C – 12 to 15 seconds

A good driver normally looks at least 12 to 15 seconds ahead, based on the distance the vehicle will travel during that time. This is approximately one block at lower speeds and about one-quarter mile at highway speeds. The driver should continue shifting attention between nearby conditions and hazards farther ahead.

Source: Missouri Commercial Driver License Manual — § 2.4.1, “How Far Ahead to Look”

Question 3

Which task should you perform regularly while the vehicle is moving during a trip?

  1. A Inspect brake-fluid hoses from beneath the vehicle
  2. B Measure tire tread depth while rolling slowly
  3. C Monitor instruments and gauges for signs of trouble
  4. D Disconnect and reconnect the trailer electrical cable

Correct answer: C – Monitor instruments and gauges for signs of trouble

During a trip, watch the instruments and gauges for indications of mechanical trouble. Also remain alert for unusual sights, sounds, smells, or changes in how the vehicle feels. When stopped, inspect critical items such as tires, wheels, brakes, lights, reflectors, trailer connections, coupling devices, and cargo securement.

Source: Missouri Commercial Driver License Manual — § 2.1.2, “During a Trip”

Question 4

A driver who is not part of a moving, properly lighted funeral procession may drive between procession vehicles only when:

  1. A Traffic is moving below the speed limit
  2. B The driver has a green traffic signal
  3. C There appears to be enough space
  4. D Directed by law enforcement or operating a signaling emergency vehicle

Correct answer: D – Directed by law enforcement or operating a signaling emergency vehicle

Missouri law prohibits a nonparticipating driver from moving between vehicles in an organized funeral procession while the procession is moving with its emergency lights activated. The stated exceptions apply when a law enforcement officer directs the movement or when the person is operating an emergency vehicle giving an audible or visual signal. A green light or an open gap does not create another exception.

Source: RSMo § 194.509.1(1) — Regulations for Nonparticipating Vehicle Operators—Violations, Penalty

Question 5

How does closer axle spacing generally affect the weight allowed under a bridge formula?

  1. A It permits more weight on the axle group
  2. B It permits less weight on the axle group
  3. C It has no effect on the allowed weight
  4. D It changes only the manufacturer's GVWR

Correct answer: B – It permits less weight on the axle group

Federal Interstate weight law calculates allowable gross weight for an axle group using the number of axles and the distance between the group's outer axles. Shorter spacing generally results in a lower allowable weight. The Missouri CDL manual summarizes this by explaining that bridge formulas permit less weight when axles are closer together, helping prevent bridge and roadway overloading.

Source: Missouri Commercial Driver License Manual — § 3.2.2, “Legal Weight Limits”, 23 U.S.C. § 127(a)(2) — Vehicle Weight Limitations—Interstate System

Question 6

Which listed lighting or reflective equipment should be clean and working to help other road users see the vehicle?

  1. A Reflectors and marker lights
  2. B Clearance lights and taillights
  3. C Identification lights
  4. D All of the above

Correct answer: D – All of the above

All listed devices contribute to the visibility and identification of a commercial vehicle. During the inspection, check that clearance, identification, marker, and rear lights are clean, operating, and the proper color. Reflectors must also be clean, present, undamaged, and the proper color for their location on the vehicle.

Source: Missouri Commercial Driver License Manual — § 2.1.5, “Step 5: Do Walk-around Inspection”

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