100+ Free BTEB Automotive Mechanics Practice Questions

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Sample BTEB Automotive Mechanics Practice Questions

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

1In a four-stroke petrol engine, what is the correct sequence of the four strokes during one complete cycle?

A.Intake, power, compression, exhaust

B.Intake, compression, power, exhaust

C.Compression, intake, exhaust, power

D.Exhaust, power, compression, intake

Explanation: A four-stroke engine completes its cycle in the order intake (induction), compression, power (combustion/expansion), and exhaust. Each stroke is one movement of the piston, so the full cycle takes two crankshaft revolutions.

2How many crankshaft revolutions are required to complete one full cycle of a four-stroke engine?

A.One revolution

B.Two revolutions

C.Three revolutions

D.Four revolutions

Explanation: A four-stroke engine needs two crankshaft revolutions (720 degrees) for one complete cycle. The piston makes four strokes, two down and two up, and each pair of strokes corresponds to one revolution.

3What is the approximate stoichiometric air-fuel ratio (by mass) for a petrol (gasoline) engine?

A.10.5 : 1

B.12.5 : 1

C.14.7 : 1

D.18.0 : 1

Explanation: The stoichiometric air-fuel ratio for petrol is approximately 14.7:1 by mass, meaning 14.7 kilograms of air are needed to completely burn 1 kilogram of fuel. This ratio gives complete combustion and is the target for catalytic converter efficiency.

4Which method is used to ignite the fuel in a diesel (compression-ignition) engine?

A.A spark plug discharge

B.Heat generated by compressing the air

C.A glow plug burning continuously

D.An electric heating element in the fuel

Explanation: A diesel engine relies on compression ignition: the air alone is compressed to a high ratio, raising its temperature high enough that injected diesel fuel ignites spontaneously. No spark plug is used during normal running.

5Compared with a petrol engine, the compression ratio of a diesel engine is generally:

A.Much lower

B.About the same

C.Much higher

D.Always exactly 9:1

Explanation: Diesel engines use much higher compression ratios, typically around 14:1 to 22:1, compared with about 8:1 to 12:1 for petrol engines. The high ratio is needed to raise air temperature enough for compression ignition.

6The compression ratio of an engine is defined as the ratio of:

A.Clearance volume to swept volume

B.Total cylinder volume to clearance volume

C.Swept volume to bore diameter

D.Power output to engine displacement

Explanation: Compression ratio equals the total cylinder volume (swept plus clearance) when the piston is at bottom dead centre divided by the clearance volume when the piston is at top dead centre. It expresses how much the air or mixture is compressed.

7What is the common firing order for an inline four-cylinder petrol engine?

A.1-2-3-4

B.1-3-4-2

C.1-4-2-3

D.1-2-4-3

Explanation: The most common firing order for an inline four-cylinder engine is 1-3-4-2. This sequence spaces the power impulses evenly and balances the loads on the crankshaft and bearings.

8Top Dead Centre (TDC) refers to the position where the piston is:

A.At the lowest point of its travel

B.At the highest point of its travel

C.Exactly halfway down the cylinder

D.Moving at its maximum speed

Explanation: Top Dead Centre is the position at which the piston has reached the highest point of its travel in the cylinder, closest to the cylinder head. Bottom Dead Centre is the opposite, lowest point.

9The swept volume of a single cylinder is the volume displaced by the piston as it moves between:

A.TDC and the cylinder head

B.TDC and BDC

C.BDC and the crankcase

D.Two consecutive power strokes

Explanation: Swept (displacement) volume is the volume the piston sweeps through as it travels from Top Dead Centre to Bottom Dead Centre. The total engine displacement is this figure multiplied by the number of cylinders.

10Which engine component converts the reciprocating motion of the piston into rotary motion?

A.Camshaft

B.Crankshaft

C.Flywheel

D.Timing belt

Explanation: The crankshaft, connected to the piston through the connecting rod, converts the up-and-down (reciprocating) motion of the piston into rotary motion that drives the transmission. Its offset crank throws create the rotating effect.

About the BTEB Automotive Mechanics Exam

The BTEB National Skill Certificate in Automotive Mechanics is a Bangladesh vocational qualification awarded under the NTVQF for technicians who service and repair motor vehicles. Assessment combines a written trade-theory paper with a practical competency demonstration covering engines, fuel and ignition, cooling and lubrication, transmission, brakes, steering and suspension, automotive electrical systems, diagnostics, tools and workshop safety.

Assessment

Competency-based trade assessment under the National Technical and Vocational Qualifications Framework (NTVQF), combining a written theory paper of multiple-choice and short-answer questions with a practical (hands-on) demonstration of automotive repair skills.

Time Limit

The written theory paper is typically about 1.5-3 hours, with a separate practical assessment; exact durations vary by NTVQF level and institute.

Passing Score

Assessment is competency-based, so candidates must be rated 'Competent' on each performance criterion. A written-theory benchmark of roughly 60% is commonly used, but BTEB sets the definitive standard for your level.

Exam Fee

Trade-test and certification fees are set by BTEB and the registered institute and vary by NTVQF level and centre. Confirm the current fee with your institute or BTEB. (Bangladesh Technical Education Board (BTEB))

BTEB Automotive Mechanics Exam Content Outline

16%

Engine Fundamentals

Four-stroke and two-stroke cycles, petrol versus diesel, compression ratio, firing order, engine terminology, knock and combustion.

20%

Engine Systems

Fuel and injection, carburettor, ignition, cooling, lubrication, intake, exhaust, turbocharging and emission control.

13%

Transmission and Driveline

Clutch, manual and automatic gearboxes, gear ratios, synchromesh, propeller shaft, universal joints and differential.

12%

Brakes

Hydraulic operation, Pascal's law, disc and drum brakes, brake fluid, bleeding, ABS, brake fade and the parking brake.

11%

Steering and Suspension

Springs and dampers, wheel alignment, steering gear, power steering, tyres, balancing, anti-roll bars and tyre wear.

12%

Automotive Electrical

Battery, charging and starting systems, alternator, voltage regulator, Ohm's law, fuses, circuit testing and short circuits.

10%

Diagnostics

OBD scan tools, trouble codes, sensors, compression testing, exhaust-smoke and misfire interpretation and common faults.

Tools, Measurement and Workshop Safety

Micrometer, vernier, dial and feeler gauges, torque wrench, PPE, lifting and fire safety, and hazardous-material handling.

How to Pass the BTEB Automotive Mechanics Exam

What You Need to Know

Passing score: Assessment is competency-based, so candidates must be rated 'Competent' on each performance criterion. A written-theory benchmark of roughly 60% is commonly used, but BTEB sets the definitive standard for your level.
Assessment: Competency-based trade assessment under the National Technical and Vocational Qualifications Framework (NTVQF), combining a written theory paper of multiple-choice and short-answer questions with a practical (hands-on) demonstration of automotive repair skills.
Time limit: The written theory paper is typically about 1.5-3 hours, with a separate practical assessment; exact durations vary by NTVQF level and institute.
Exam fee: Trade-test and certification fees are set by BTEB and the registered institute and vary by NTVQF level and centre. Confirm the current fee with your institute or BTEB.

Keys to Passing

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

BTEB Automotive Mechanics Study Tips from Top Performers

1Master the core technical facts first, such as the four-stroke cycle order, the petrol stoichiometric ratio of about 14.7:1, the 1-3-4-2 firing order and the difference between petrol and diesel compression ratios.

2Link theory to the workshop: when you study brakes, lubrication or charging, picture the actual components and how you would test them, because the practical assessment rewards hands-on understanding.

3Do not skip tools, measurement and safety; questions on the micrometer, vernier, torque wrench, PPE, fire classes and used-oil disposal are easy marks if you revise them properly.

Frequently Asked Questions

Who awards the BTEB National Skill Certificate in Automotive Mechanics?

It is awarded by the Bangladesh Technical Education Board (BTEB) under the National Technical and Vocational Qualifications Framework (NTVQF). Training and assessment take place at BTEB-registered technical institutes and assessment centres across Bangladesh.

Is the BTEB automotive mechanics exam only multiple choice?

No. The qualification is competency-based and combines a written trade-theory component (which includes multiple-choice and short-answer questions) with a practical hands-on demonstration of repair skills. This free bank focuses on the trade-theory knowledge you need for the written part.

What topics does the automotive mechanics trade theory cover?

It covers engine fundamentals, fuel and ignition systems, cooling and lubrication, transmission and driveline, brakes, steering and suspension, automotive electrical systems, diagnostics, precision measuring tools and workshop safety. These 100 practice questions are distributed across all of those areas.

What score do I need to pass?

Because the assessment is competency-based, you must be judged 'Competent' against each performance criterion rather than reaching one fixed mark. A written-theory benchmark of around 60% is commonly cited, but BTEB sets the definitive standard for your NTVQF level, so confirm it with your institute.