100+ Free NAVTTC Auto Mechanic Practice Questions

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2026 Statistics

Key Facts: NAVTTC Auto Mechanic Exam

30 mins

Theory Exam Duration

NAVTTC / Takamol SVP

90 mins

Practical Exam Duration

NAVTTC / Takamol SVP

50%

Passing Mark

NAVTTC / Takamol SVP

PKR 19k

Test Fee

Takamol SVP Portal

5 Years

Certificate Validity

SVP Certification

30-45°

Honing Crosshatch Angle

Engine Build Specs

The NAVTTC Auto Mechanic trade test requires a 30-minute computer-based theory exam and a 90-minute practical workshop test. It costs PKR 19,000 and covers engine components, repair/overhauling, transmission, brakes, steering/suspension, diagnostics, and workshop safety.

Sample NAVTTC Auto Mechanic Practice Questions

Try these sample questions to test your NAVTTC Auto Mechanic exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the primary function of the piston rings in an internal combustion engine?

A.To connect the piston to the connecting rod

B.To seal the combustion chamber and regulate oil consumption

C.To open and close the intake and exhaust valves

D.To balance the rotation of the crankshaft

Explanation: Piston rings serve to seal the combustion chamber to prevent gas leakage (blow-by), transfer heat from the piston to the cylinder wall, and scrape excess oil off the cylinder walls to regulate oil consumption. Without proper sealing, the engine loses compression and burns oil, leading to poor performance.

2In a standard four-stroke internal combustion engine, which stroke immediately follows the compression stroke?

A.Intake stroke

B.Exhaust stroke

C.Power stroke

D.Scavenging stroke

Explanation: The standard four-stroke cycle consists of: Intake, Compression, Power (Expansion), and Exhaust. During the compression stroke, the piston compresses the air-fuel mixture, which is then ignited by the spark plug (or by heat of compression in diesel engines), pushing the piston downward during the power stroke.

3What is the main purpose of a spark plug in a petrol engine?

A.To spray pressurized fuel into the cylinder

B.To ignite the compressed air-fuel mixture

C.To monitor the oxygen content in the exhaust

D.To heat the engine block before starting

Explanation: The spark plug provides the electrical spark necessary to ignite the air-fuel mixture in petrol (spark-ignition) engines. This ignition initiates the combustion process that pushes the piston down during the power stroke.

4What is the primary difference in ignition methods between petrol and diesel engines?

A.Petrol engines use compression ignition, while diesel engines use spark ignition

B.Petrol engines require glow plugs, while diesel engines require spark plugs

C.Petrol engines use spark ignition, while diesel engines use compression ignition

D.Petrol engines use battery ignition, while diesel engines use magneto ignition

Explanation: Petrol engines are spark-ignition (SI) engines, using a spark plug to ignite the air-fuel mixture. Diesel engines are compression-ignition (CI) engines, relying on high temperature generated by compressing air to ignite fuel injected into the cylinder.

5Which engine component is responsible for controlling the opening and closing of the intake and exhaust valves?

A.The crankshaft

B.The connecting rod

C.The piston pin

D.The camshaft

Explanation: The camshaft has lobes that push against the valves (either directly or through lifters, pushrods, and rocker arms) to open them at precise intervals. Valve springs are used to return the valves to their closed positions.

6What is the main purpose of the cylinder block in an engine?

A.To house the transmission gears

B.To support the engine valves and fuel injectors

C.To provide the cylinders for pistons and structural support for the engine

D.To contain the radiator coolant for cooling

Explanation: The cylinder block is the main structural body of the engine. It contains the cylinders in which the pistons move up and down, and provides passages (water jackets) for coolant and oil channels for lubrication.

7What is defined as the ratio of the maximum cylinder volume (piston at BDC) to the minimum cylinder volume (piston at TDC)?

A.Displacement ratio

B.Compression ratio

C.Volumetric efficiency

D.Thermal efficiency

Explanation: The compression ratio is calculated by dividing the volume of the cylinder when the piston is at Bottom Dead Center (BDC) by the volume of the cylinder (combustion chamber) when the piston is at Top Dead Center (TDC). A higher compression ratio generally yields more engine power and efficiency but requires higher octane fuel.

8In a standard four-stroke engine, what is the speed ratio of the crankshaft to the camshaft?

A.1:1 (they rotate at the same speed)

B.1:2 (camshaft rotates at twice the speed of the crankshaft)

C.2:1 (crankshaft rotates at twice the speed of the camshaft)

D.4:1 (crankshaft rotates at four times the speed of the camshaft)

Explanation: In a four-stroke engine, each valve opens once every two revolutions of the crankshaft. Therefore, the camshaft must rotate at half the speed of the crankshaft, which means the crankshaft to camshaft speed ratio is 2:1.

9What is the primary function of the engine flywheel?

A.To cool down the clutch plate

B.To store rotational energy and smooth out power fluctuations

C.To drive the alternator and water pump belts

D.To lubricate the rear main seal of the crankshaft

Explanation: Because a four-stroke engine only produces power during the power stroke (one out of four strokes), the rotation would be jerky. The flywheel is a heavy disk attached to the crankshaft that uses its inertia to store kinetic energy and maintain steady rotational speed between power strokes.

10What is the purpose of valve overlap in a four-stroke engine design?

A.To prevent the piston from hitting the valves

B.To allow both intake and exhaust valves to remain closed during combustion

C.To improve scavenging of exhaust gases and increase intake air charge

D.To decrease the compression ratio during cold starting

Explanation: Valve overlap is the period at the end of the exhaust stroke and beginning of the intake stroke when both the intake and exhaust valves are slightly open at the same time. The outgoing exhaust gas momentum creates a vacuum that helps pull in the fresh intake charge, improving engine breathing and volumetric efficiency.

About the NAVTTC Auto Mechanic Exam

The NAVTTC Auto Mechanic trade test validates technical competence in motor vehicle mechanical systems. Aligned with the Takamol Skills Verification Program (SVP) for workers seeking international employment, the exam assesses understanding of engine fundamentals, cylinder head and block repair, transmission and clutch systems, suspension, steering, brakes, basic diagnostics, and workshop safety. The certification process requires passing a 30-minute computer-based theoretical exam followed by a 90-minute practical hands-on demonstration of troubleshooting and engine mechanical repairs in a workshop setting.

Assessment

20-30 multiple-choice theory questions and a hands-on practical workshop evaluation

Time Limit

30-minute theory exam, 90-minute practical exam

Passing Score

50% minimum passing score

Exam Fee

PKR 19,000 (National Vocational and Technical Training Commission (NAVTTC) of Pakistan)

NAVTTC Auto Mechanic Exam Content Outline

20%

Engine Fundamentals & Components

Four-stroke petrol and diesel cycles, cylinder configurations, valves, piston rings, crankshaft and camshaft operation.

15%

Engine Repair & Overhauling

Cylinder head gaskets, measuring bore clearances, cylinder honing, valve grinding, and torque specifications.

15%

Transmission & Drivetrain Systems

Clutches, manual gearboxes, torque converters, planetary gearsets, driveshafts, U-joints, and differentials.

15%

Braking Systems

Disc and drum brake operation, master cylinders, brake boosters, hydraulic lines, bleeding procedures, and ABS modulator operations.

15%

Steering, Suspension & Wheels

Rack and pinion steering, power steering systems, MacPherson struts, shock absorbers, control arms, and wheel alignment (camber, caster, toe).

10%

Electrical, Fuel Systems & Diagnostics

Fuel injectors, pressure regulators, spark plugs, ignition coils, sensor operations (MAF, MAP, O2), and OBD-II scanner code readings.

10%

Workshop Safety, Tools & Measurement

Use of micrometers, feeler gauges, dial indicators, torque wrenches, jack stands, fire extinguishers, and hazardous waste disposal.

How to Pass the NAVTTC Auto Mechanic Exam

What You Need to Know

Passing score: 50% minimum passing score
Assessment: 20-30 multiple-choice theory questions and a hands-on practical workshop evaluation
Time limit: 30-minute theory exam, 90-minute practical exam
Exam fee: PKR 19,000

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NAVTTC Auto Mechanic Study Tips from Top Performers

1Practice using outside micrometers to measure crankshaft journals and cylinder bore dial indicators to check for cylinder taper and out-of-round.

2Understand the exact four-stroke valve timing events and how to calculate gear ratios of various planetary configurations.

3Know how to test engine compression using a mechanical compression tester and identify wet vs dry compression results.

4Review the steps for bleeding air out of hydraulic braking systems and adjusting brake drum shoe clearance.

5Master wheel alignment parameters, focusing on how Camber, Caster, and Toe angles affect tire wear and vehicle pulling symptoms.

6Study sensor diagnostics, especially Oxygen sensors, Mass Air Flow (MAF) sensors, and Manifold Absolute Pressure (MAP) sensors.

7Always prioritize shop safety: wear PPE, use jack stands, identify the correct class of fire extinguishers, and practice safe hazardous fluid disposal.

Frequently Asked Questions

What is the NAVTTC Auto Mechanic trade test?

It is a standardized vocational competency assessment in Pakistan administered by NAVTTC. It is also the designated pathway for the Takamol Skills Verification Program (SVP) for Pakistani auto mechanics planning to work in Saudi Arabia.

How is the Auto Mechanic test structured?

The test has two parts: a 30-minute computer-based theoretical exam containing multiple-choice questions, and a 90-minute practical workshop test where you must demonstrate troubleshooting, component measurements, and mechanical repairs on an engine.

What is the passing score and how much does it cost?

The exam requires a minimum score of 50% to pass both components. The official fee for the Takamol SVP registration and trade test is approximately PKR 19,000, paid via the designated banks or online channels.

Where can I take the NAVTTC trade test?

The test is conducted at NAVTTC-authorized assessment centers and TEVTA vocational labs across major cities in Pakistan (e.g. Islamabad, Rawalpindi, Lahore, Karachi, Peshawar).

How long is the Auto Mechanic certificate valid?

Once you successfully pass both the theory and practical parts, the certificate is issued electronically and is valid for a period of 5 years, after which recertification is required.