Pennsylvania CDL Combination Practice Test (PA) 2

5 out of 5 (57 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Prepare yourself thoroughly for the Pennsylvania CDL with our PA permit test practice, designed specifically to help you master the essentials. This PA permit practice test includes 20 multiple-choice questions that cover critical topics such as inspection procedures, safe driving practices, air brake systems, and more. To pass, you must correctly answer at least 16 questions. The diverse range of questions will help you gain the confidence and knowledge needed for the real permit test. A crucial area covered is understanding the risks of jackknifing, which occurs when the trailer swings out of alignment with the tractor. Learning to avoid this through smooth braking and careful handling is vital for safe driving. Our permit test online provides reliable study tools, far superior to dubious 'DMV test cheat sheets'. Cheat sheets may promise quick success, but they often carry questionable legality and effectiveness. Instead, our Pennsylvania combination vehicle test offers a lawful and proven method to prepare. Based on the official drivers manual, the questions on this test reflect the content found in the actual DMV permit test. If it's not in the manual, it won't be on the test. For comprehensive preparation, supplement this CDL combination practice test with additional study materials such as the drivers handbook, a state-certified drivers ed course, flashcards, and road sign charts. This holistic approach ensures you target all areas of the DMV permit test, leaving no stone unturned. PA offers unique driving challenges, from navigating the mountainous terrain of the Alleghenies to dealing with the heavy snowfall in the northern regions. Understanding these local conditions is crucial for safe driving and is emphasized in our PA combination CDL practice test. Our Pennsylvania combination CDL practice test is your trusted partner in achieving your CDL. It provides a realistic simulation of the actual test, ensuring you're well-prepared for every aspect. Don't rely on shortcuts - choose a method that builds real knowledge and skills.
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Sample Pennsylvania Combination Test Questions

Question 1

Which braking practice presents less danger of causing a trailer skid or jackknife during normal driving?

  1. A Use the foot brake and reserve the trailer hand valve for testing
  2. B Accelerate before each brake application
  3. C Apply the trailer hand valve before the foot brake
  4. D Wait until entering a turn before braking

Correct answer: A – Use the foot brake and reserve the trailer hand valve for testing

The foot brake sends air to the service brakes throughout the combination, including the trailer. The trailer hand valve applies only the trailer brakes and can make the trailer skid. It should be reserved for testing trailer-brake operation rather than routine driving.

Source: Pennsylvania Commercial Driver’s License Manual — § 6.2.1, “Trailer Hand Valve”

Question 2

Rearward amplification can make the last trailer in a multi-trailer combination more likely to roll over during a sudden steering maneuver. True or false?

  1. A TRUE
  2. B FALSE

Correct answer: A – TRUE

Rearward amplification causes the crack-the-whip effect in combination vehicles. A quick steering movement can become more severe as it travels toward the rear of the combination, increasing the final trailer’s rollover risk. Pennsylvania’s commercial driver manual instructs drivers pulling trailers to steer gently and smoothly.

Source: Pennsylvania Commercial Driver’s License Manual — § 6.1.2, “Steer Gently”

Question 3

What does “off-tracking” mean when a combination vehicle turns?

  1. A The tractor leaves the roadway while the trailer stays in its lane
  2. B The vehicle changes direction halfway through the turn
  3. C The rear wheels follow a different path from the front wheels
  4. D The vehicle travels from pavement onto a gravel road

Correct answer: C – The rear wheels follow a different path from the front wheels

Off-tracking occurs because the rear wheels follow a different path from the front wheels while turning. Longer vehicles off-track more, and trailer wheels generally track farther inward than the powered unit’s rear wheels. When several trailers are present, the last trailer’s rear wheels off-track the most.

Source: Pennsylvania Commercial Driver’s License Manual — § 6.1.6, “Turn Wide”

Question 4

Why must wheel chocks be used when parking a trailer that has no spring brakes?

  1. A They raise the trailer to the correct coupling height
  2. B Stored air can leak away and leave the trailer without brakes
  3. C They keep the trailer air tanks fully charged
  4. D They prevent moisture from entering the air lines

Correct answer: B – Stored air can leak away and leave the trailer without brakes

A trailer without spring brakes uses stored air to operate its emergency brakes and has no separate parking brake. The brakes hold only while pressure remains in the trailer air tank. Air can eventually leak away, releasing the brakes, so wheel chocks are needed to keep the trailer from moving.

Source: Pennsylvania Commercial Driver’s License Manual — § 6.2.8, “Trailer Service, Parking and Emergency Brakes”

Question 5

If a trailer breaks away and separates the air lines, what should happen when the tractor protection system works properly?

  1. A All air should drain from the tractor
  2. B The trailer air-supply valve should remain open
  3. C The tractor brakes should immediately lock
  4. D The trailer emergency brakes should apply while the tractor brakes remain operable

Correct answer: D – The trailer emergency brakes should apply while the tractor brakes remain operable

Loss of pressure in the emergency line causes the trailer emergency brakes to apply. The tractor protection valve closes to stop air from escaping from the tractor through the separated or leaking trailer system. With that protection operating properly, the tractor retains air for its own brakes.

Source: Pennsylvania Commercial Driver’s License Manual — § 6.2.2, “Tractor Protection Valve”, Pennsylvania Commercial Driver’s License Manual — § 6.2.4, “Trailer Air Lines”

Question 6

During a static air-leakage test with the brakes released, pressure in a combination vehicle should drop less than which rate?

  1. A 1 psi per minute
  2. B 2 psi per minute
  3. C 3 psi per minute
  4. D 4 psi per minute

Correct answer: C – 3 psi per minute

Pennsylvania’s manual specifies a loss rate of less than three psi in one minute for a combination vehicle with no brake application. Perform the check with the air system fully charged, the engine off, and the parking brakes released. Excessive pressure loss indicates a leak that must be corrected before driving.

Source: Pennsylvania Commercial Driver’s License Manual — § 5.3.3, “Step 7 Final Air Brake Check”

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