Free Practice Questions for Iraq Heavy Vehicle Driving Theory

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Sample Iraq Heavy Vehicle Driving Theory Practice Questions

Try these sample questions to review concepts for the Iraq Heavy Vehicle Driving Theory exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a commercial heavy vehicle equipped with air brakes, what is the primary function of the air compressor governor?

A.It controls when the air compressor pumps air into the air storage tanks and when it unloads

B.It regulates the flow of diesel fuel to the engine injectors during heavy braking

C.It monitors tire inflation pressure and automatically inflates under-pressured tires

D.It shifts the automatic transmission into neutral when air pressure drops

Explanation: The air compressor governor controls when the air compressor pumps air into the reservoirs. When air tank pressure rises to the cut-out level (typically around 125 psi), the governor stops compressor pumping. When pressure drops to cut-in level (around 100 psi), it allows pumping to resume.

2At what typical minimum pressure must the low air pressure warning buzzer and visual signal activate in a heavy commercial vehicle?

A.When air pressure reaches 120 psi

B.Before air pressure drops below 60 psi (approximately 4.1 bar)

C.Only when pressure reaches 0 psi and brakes have locked

D.At 20 psi after the spring brakes have fully applied

Explanation: Air-brake system design convention worldwide sets the low-pressure warning to trigger before tank pressure falls below about 60 psi (4.1 bar), well above the 20–45 psi band where the spring brakes apply themselves. That margin is what gives the driver time to reach a safe stopping place instead of being stopped by the springs. Iraq's Traffic Law No. 8 of 2019 requires a serviceable braking system as a roadworthiness condition but does not publish a psi figure of its own.

3What happens when air pressure in both service brake reservoirs drops below approximately 20 to 45 psi?

A.The vehicle immediately accelerates to clear traffic lanes

B.The service brakes become hydraulically assisted by power steering fluid

C.The mechanical spring brakes (emergency brakes) automatically engage and lock the wheels

D.The engine automatically restarts in reverse gear

Explanation: Spring brakes are held back by air pressure. If air pressure drops below approximately 20 to 45 psi due to catastrophic leakage, the powerful mechanical springs overcome remaining air pressure and apply the emergency brakes automatically.

4Why must heavy vehicle drivers drain moisture and oil from air brake reservoirs daily?

A.To prevent brake fluid from mixing with windshield washer fluid

B.Draining water increases vehicle fuel efficiency by 15%

C.To lubricate the exterior surface of the brake drum

D.Moisture and oil can freeze in valves, cause internal corrosion, and cause catastrophic brake failure

Explanation: Compressed air contains water vapor and compressor oil vapor. If not drained daily through drain valves, accumulated water causes corrosion, rots rubber diaphragms, and can freeze in cold weather, blocking pneumatic valves and causing brake failure.

5What is 'brake lag distance' in an air brake system compared to hydraulic car brakes?

A.The additional distance traveled during the fraction of a second it takes for compressed air to flow through lines and actuate the brake shoes

B.The time it takes for brake pads to cool down after descending a mountain

C.The delay caused when shifting between high and low transmission splitters

D.The distance between the tractor cab and the trailer kingpin

Explanation: Air takes time to flow through hoses and valves to brake chambers. At 90 km/h, brake lag adds approximately 0.4 seconds (about 10 meters) to stopping distance before brake shoes physically touch drums, unlike instantaneous hydraulic brakes.

6What causes severe 'brake fade' when descending a long, steep grade in a heavy commercial vehicle?

A.The air compressor producing excessive air pressure that blows off safety valves

B.Excessive heat generated by continuous friction that expands brake drums and reduces shoe friction

C.Cooling radiator fan operation drawing power away from the brakes

D.Tire tread rubber hardening due to high highway speeds

Explanation: Brake fade occurs when continuous, heavy braking produces extreme heat in drums and linings. Drums expand away from brake shoes, linings glaze and lose friction coefficient, requiring increasingly more pedal pressure until braking power fails completely.

7How should a heavy truck driver descend a steep downgrade to prevent brake fade and loss of control?

A.Shift into neutral and rely entirely on the foot brake pedal to control speed

B.Turn off the engine ignition to reduce downhill vehicle speed

C.Select a low gear before starting down the hill and use engine braking/retarders, supplemented only with brief snub braking

D.Keep foot continuously pressed lightly on the brake pedal throughout the entire descent

Explanation: Proper mountain descent technique requires selecting a low gear before beginning the grade. The engine braking effect and auxiliary retarder hold the vehicle back, with short, firm 'snub' braking applied only when speed exceeds the safe threshold.

8What is the primary danger of using an engine retarder (exhaust or Jake brake) on slippery, wet, or sandy road surfaces?

A.It consumes excessive amounts of diesel fuel during deceleration

B.It rapidly discharges the heavy truck electrical battery system

C.It causes the trailer air tanks to over-pressurize and vent

D.It can cause the drive wheels to skid and lose traction, potentially causing an immediate jackknife

Explanation: Engine retarders apply strong braking torque solely to the drive axles. On slippery or low-traction surfaces (wet asphalt, mud, or loose desert sand), this sudden deceleration torque can break drive wheel traction, leading to an immediate spin or jackknife.

9What is the purpose of an automatic slack adjuster in an S-cam drum air brake system?

A.To automatically maintain proper clearance between the brake shoes and the brake drum as linings wear

B.To automatically tighten trailer cargo tie-down straps during transit

C.To compensate for differences in tire air pressure across dual rear tires

D.To modulate diesel engine idle speed when idling at weigh stations

Explanation: Automatic slack adjusters mechanically adjust the link between the brake chamber push rod and the S-cam shaft, keeping brake shoe clearance within legal tolerance as friction linings wear down, ensuring effective brake stroke.

10During a pre-trip inspection of a heavy vehicle's dual air brake system, what is the maximum acceptable air leakage rate for a single vehicle with the engine off and service brakes firmly applied?

A.No more than 3 psi in one minute

B.No more than 15 psi in one minute

C.No more than 25 psi in one minute

D.Air leakage rate does not matter as long as the compressor is working

Explanation: For a single heavy commercial vehicle (truck or bus), standard pre-trip air leakage tests permit a maximum static loss of no more than 2 psi/min with brakes released, and no more than 3 psi/min with service brakes firmly applied.

About the Iraq Heavy Vehicle Driving Theory Exam

Iraq's public and heavy vehicle driving licence (عمومي) is issued by the General Directorate of Traffic (مديرية المرور العامة) under the Ministry of Interior for goods vehicles and passenger transport. Traffic Law No. 8 of 2019 (قانون المرور رقم 8 لسنة 2019) defines a heavy vehicle as a goods vehicle over 2.5 tonnes unladen and a bus as a vehicle built to carry more than fourteen passengers, split at twenty-six seats into light and heavy buses. Article 21 sets higher minimum ages for the commercial categories — 20 years for categories (ب) and (و), 25 years for category (ج) — and requires a practical test matching the licence type. Commercial drivers also carry specific statutory duties: covering loads securely, staying within prescribed load heights, keeping goods vehicles off the left of the carriageway, and observing the lower expressway speed band for goods vehicles. This practice bank is an independent English-language multiple-choice study adaptation by OpenExamPrep; the official test is conducted in Arabic and this bank is not a translation of it or a simulation of its format.

Exam sponsor: General Directorate of Traffic, Ministry of Interior (مديرية المرور العامة - وزارة الداخلية). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Computerised theory test (10 questions, 15 minutes, 60-point pass mark), then a practical test on the class of vehicle applied for. Article 21(Fourth) of Traffic Law No. 8 of 2019 requires the practical test to match the type of licence, and the traffic directorate operates separate test vehicles for passenger cars, motorcycles and heavy transport.

Time Limit

15 minutes

Passing Score

60%

Exam / Certification Fees

Set by Council of Ministers decision and varies by site and governorate. The directorate publishes public (عمومي) licence renewal at IQD 40,000 for ten years plus IQD 10,000 for the card.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

15% of our practice bank

Air Brake Systems

Compressor and governor operation, dual circuits, air dryers, daily reservoir draining, slack adjusters, low-pressure warnings, spring brakes and leakage testing.

27% of our practice bank

Heavy Vehicle Dynamics and Combination Vehicles

Rollover threshold and centre of gravity, off-tracking and buttonhook turns, jackknife causes and recovery, blind spots, fifth wheel coupling, and reversing.

21% of our practice bank

Cargo, Weights and Tanker Operations

Load placement and distribution, blocking and chocking, working load limits, axle loading and bridge stress, liquid surge, and tank outage.

18% of our practice bank

Iraqi Traffic Law, Licensing and Bus Regulations

Article 21 categories and ages, Article 1 vehicle and bus definitions, Article 25 fine tiers, renewal grace periods, and passenger bus equipment and capacity.

19% of our practice bank

Inspection, Hazardous Materials and Emergencies

Pre-trip defects, tyre and drum condition, conspicuity markings, hazard placards and shipping papers, breakdown warning, and blowout and adverse-condition response.

Preparing for the Iraq Heavy Vehicle Driving Theory Exam

What You Need to Know

Passing score: 60%
Assessment: Computerised theory test (10 questions, 15 minutes, 60-point pass mark), then a practical test on the class of vehicle applied for. Article 21(Fourth) of Traffic Law No. 8 of 2019 requires the practical test to match the type of licence, and the traffic directorate operates separate test vehicles for passenger cars, motorcycles and heavy transport.
Time limit: 15 minutes
Exam / certification fees: Set by Council of Ministers decision and varies by site and governorate. The directorate publishes public (عمومي) licence renewal at IQD 40,000 for ten years plus IQD 10,000 for the card. Official sources

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Iraq Heavy Vehicle Driving Theory: Suggested Study Strategy

1Learn the air brake system as a chain — compressor, governor, dryer, reservoirs, dual circuits, low-pressure warning, spring brakes — and you can reason your way through most component questions rather than memorising them.

2Fix the Article 21 age ladder in mind as four steps: 16 for category (ز), 18 for (أ) and (هـ), 20 for (ب) and (و), 25 for (ج).

3Remember that Iraqi expressway speeds are set by vehicle type, not by lane — a goods vehicle is capped at 90 km/h externally and 80 km/h on an urban expressway, with minimums of 70 and 60.

4Master the wide right turn: keep the rear of the vehicle close to the kerb on approach so a car cannot slip into your right blind spot, then swing wide into the receiving street.

5Note which load offences sit in the 200,000 IQD tier — uncovered loads and excess load height or overhang — and that the officer can hold the vehicle for up to five days for anything in that tier.

Frequently Asked Questions

What is the minimum age for a commercial driving licence in Iraq?

Article 21 of Traffic Law No. 8 of 2019 sets the age by category letter: 16 years for category (ز), 18 years for categories (أ) and (هـ) and the disabled-driver and deaf-and-mute categories, 20 years for categories (ب) and (و), and 25 years for category (ج) — the highest age bar in the law.

How does Iraqi law define a heavy vehicle and a bus?

Article 1 defines a light vehicle as one built to carry people or goods weighing up to 2.5 tonnes, and a heavy vehicle as a goods vehicle whose unladen weight exceeds 2.5 tonnes. A bus is a vehicle designed to carry more than fourteen passengers, split into light buses seating up to twenty-six excluding the driver and heavy buses seating more.

What is the maximum speed for a goods vehicle on an Iraqi expressway?

The General Directorate of Traffic's speed statement sets external expressway limits by vehicle type: 120 km/h for saloon cars, 100 km/h for passenger buses and 90 km/h for goods vehicles, with minimums of 80, 80 and 70 km/h. On expressways inside cities the ceilings fall to 100, 90 and 80 km/h with a 60 km/h minimum.

Which load offences carry the heaviest fines under Traffic Law No. 8 of 2019?

Two load offences sit in Article 25(First), the 200,000 IQD tier: failing to cover a goods vehicle's load securely enough to stop it scattering or falling in transit, and exceeding the prescribed load height or overhanging the sides of the vehicle. A traffic officer may also hold the vehicle for up to five days for any Article 25(First) offence.

Is there a road-position rule specific to goods vehicles?

Yes. Article 25(Third) fines goods vehicles, agricultural machinery and modified motorcycles that travel on the left-hand side of the road, at 50,000 IQD. Iraq drives on the right, so heavy and slower traffic is expected to keep right.

In which language is the official test conducted?

The official test is administered in Arabic by the General Directorate of Traffic. This 100-question bank is an independent English-language multiple-choice study adaptation by OpenExamPrep — not an official translation, not a simulation of the official format, and not a substitute for the practical test on the vehicle class.