New Hampshire CDL Combination Practice Test (NH) 2

5 out of 5 (36 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Preparing for the NH CDL combination test is crucial for aspiring commercial drivers in our state. The New Hampshire CDL combination practice test is designed to help you gain confidence and enhance your readiness for the official test. With 20 multiple-choice questions focusing on critical topics such as inspection procedures, safe driving practices, and air brake systems, this NH drivers test practice covers essential areas needed to succeed. A distinctive feature of the New Hampshire combination CDL practice test is its focus on specific state regulations. Driving laws can vary significantly across the United States, and our DMV practice test is tailored to reflect NH's rules and road signs, providing a more targeted preparation experience. This emphasis on state-specific information ensures that you are not only well-prepared for the permit practice test but also familiar with local driving conditions. For example, driving in New Hampshire presents unique challenges, from navigating the winding roads of the White Mountains to handling winter conditions on Interstate 93. Understanding these challenges and preparing for them is a critical component of the NH CDL combination practice test. Key areas such as the risks of jackknifing, where the trailer swings out of alignment with the tractor, are thoroughly addressed. Learning how to avoid such dangerous situations through smooth braking and careful handling is vital for safe driving on New Hampshire's diverse roadways. The NH DMV written test practice helps identify knowledge gaps, allowing you to focus on specific areas where improvement is needed. By taking the New Hampshire driving test practice multiple times, you can gradually eliminate these gaps and improve your overall performance. Additionally, supplementing the combination vehicle test with other study materials, such as the state's driver's handbook, state-certified driver's education courses, flashcards, and road sign charts, is highly recommended to ensure comprehensive preparation. The NH combination CDL practice test is not just about passing; it's about ensuring you're equipped with the skills and knowledge necessary for safe and effective driving. Whether you're navigating the bustling streets of Manchester or the rural roads of Coos County, being well-prepared is essential. Dive into the combination CDL test today and take a significant step toward obtaining your commercial driver's license in New Hampshire.
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Sample New Hampshire Combination Test Questions

Question 1

What hazard is created by rearward amplification during a sudden steering maneuver?

  1. A The tractor loses air pressure more quickly
  2. B The rear trailer has a greater risk of tipping over
  3. C The vehicle’s stopping distance becomes shorter
  4. D The trailer tires receive less wear

Correct answer: B – The rear trailer has a greater risk of tipping over

Rearward amplification causes steering movement to become more severe as it travels toward the last trailer. This crack-the-whip effect can make the rear trailer sway or roll over more easily than the tractor. Gentle steering, adequate following distance, and avoiding sudden lane changes help prevent this loss of stability.

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

Question 2

What color coding is commonly used for the emergency line and service line on a combination vehicle?

  1. A Black for emergency; yellow for service
  2. B Blue for emergency; red for service
  3. C Red for emergency; blue for service
  4. D Green for emergency; black for service

Correct answer: C – Red for emergency; blue for service

New Hampshire’s CDL manual identifies red as the common color for the emergency or supply line and blue as the common color for the service line. The emergency line supplies the trailer tanks and controls the emergency brakes. The service line carries the pressure signal used to apply the trailer brakes.

Source: New Hampshire Commercial Driver’s License Manual — § 6.2.4, “Trailer Air-lines”

Question 3

Which combination is especially likely to hang up on a raised railroad-highway crossing?

  1. A A standard-height tank trailer
  2. B Any trailer carrying hazardous materials
  3. C A low-slung trailer or a long trailer pulled by a single-axle tractor with low-set landing gear
  4. D A short trailer with high ground clearance

Correct answer: C – A low-slung trailer or a long trailer pulled by a single-axle tractor with low-set landing gear

New Hampshire’s CDL manual warns that low-slung units, including lowboys and car carriers, can become stuck on raised crossings. A single-axle tractor pulling a long trailer may also hang up if the landing gear is set for a tandem-axle tractor. Check the approach and underbody clearance before crossing.

Source: New Hampshire Commercial Driver’s License Manual — § 2.15.6, “Special Situations”

Question 4

Why should cargo in a combination vehicle be placed as close to the ground as practical?

  1. A It lowers the center of gravity and reduces rollover risk
  2. B It makes every item easier to unload
  3. C It eliminates the need to secure the cargo
  4. D It prevents all tire wear

Correct answer: A – It lowers the center of gravity and reduces rollover risk

Placing cargo low lowers the combination vehicle’s center of gravity, making it more resistant to overturning. Cargo piled high raises the center of gravity and increases rollover risk during turns or sudden steering. The load should also be centered and distributed so it does not cause the trailer to lean to one side.

Source: New Hampshire Commercial Driver’s License Manual — § 6.1.1, “Rollover Risks”

Question 5

After coupling, the trailer spring brakes do not release when you push in the air-supply control. What should you check first?

  1. A Whether the engine can accelerate normally
  2. B Whether the mirrors are properly adjusted
  3. C Whether the steering wheel is centered
  4. D Whether the service and emergency air lines are connected correctly

Correct answer: D – Whether the service and emergency air lines are connected correctly

If the lines are crossed, supply air enters the service line instead of charging the trailer air tanks. The trailer spring brakes will not release because they are not receiving supply pressure. Correct the connections, listen for proper brake application and release, check for major air loss, and test the trailer brakes before driving.

Source: New Hampshire Commercial Driver’s License Manual — § 6.2.5, “Hose Couplers (Glad Hands)”, New Hampshire Commercial Driver’s License Manual — § 6.4.1, “Coupling Tractor-Semitrailers”

Question 6

After uncoupling a semitrailer, which actions help protect the tractor’s disconnected lines and connectors?

  1. A Hang the electrical cable with its plug pointing down
  2. B Attach the glad hands to dummy couplers
  3. C Couple the glad hands together if dummy couplers are unavailable
  4. D All of the above

Correct answer: D – All of the above

After disconnecting the trailer, attach the glad hands to dummy couplers or couple them together when the fittings permit. Hang the electrical cable with the plug pointing down to reduce moisture entry. Support all lines and cables where they will not be crushed, caught, or damaged while the tractor is moving.

Source: New Hampshire Commercial Driver’s License Manual — § 6.4.2, “Uncoupling Tractor-Semitrailers”

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