Free Practice Questions for BTEB Refrigeration & AC Exam

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Sample BTEB Refrigeration & AC Exam Practice Questions

Try these sample questions to review concepts for the BTEB Refrigeration & AC Exam exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the basic vapor-compression refrigeration cycle, in which order does refrigerant pass through the compressor, condenser, expansion device and evaporator?

A.Compressor, condenser, expansion device, evaporator

B.Compressor, evaporator, expansion device, condenser

C.Evaporator, expansion device, compressor, condenser

D.Condenser, compressor, evaporator, expansion device

Explanation: Refrigerant leaves the compressor as a hot, high-pressure vapor and flows to the condenser to release heat and condense into a liquid. It then passes through the expansion device, which drops its pressure and temperature, before it absorbs heat and boils in the evaporator and returns to the compressor.

2What is the main function of the evaporator in a refrigeration or air conditioning system?

A.To absorb heat from the surrounding air or product as the refrigerant boils and vaporizes

B.To compress refrigerant vapor and raise its pressure and temperature

C.To reject heat from the refrigerant to the outside air as it condenses

D.To reduce the pressure of the liquid refrigerant before it enters the condenser

Explanation: The evaporator is the low-pressure heat-absorbing coil where liquid refrigerant boils into a vapor, drawing heat out of the room air or stored product. This heat absorption is what produces the cooling effect felt in the space.

3What happens to the refrigerant inside the condenser of a refrigeration system?

A.High-pressure refrigerant vapor rejects heat to the surroundings and condenses into a liquid

B.Low-pressure refrigerant liquid absorbs heat and boils into a vapor

C.Refrigerant vapor is compressed and its pressure is raised

D.Liquid refrigerant is throttled and its pressure is reduced

Explanation: In the condenser, the hot, high-pressure vapor discharged by the compressor gives up its heat to the cooler surrounding air or water, causing it to change state from a vapor to a high-pressure liquid.

4What is the primary purpose of the expansion device (such as a capillary tube or thermostatic expansion valve) in a refrigeration system?

A.To reduce the pressure and temperature of the liquid refrigerant before it enters the evaporator

B.To raise the pressure and temperature of refrigerant vapor leaving the evaporator

C.To remove moisture and acid from the refrigerant before it reaches the compressor

D.To reject heat from the refrigerant to the outside air

Explanation: The expansion device meters and throttles the high-pressure liquid refrigerant coming from the condenser, causing a sharp drop in pressure and temperature so the refrigerant enters the evaporator ready to boil and absorb heat at a low temperature.

5In a refrigeration cycle, what does the compressor primarily do to the refrigerant vapor it receives from the evaporator?

A.It raises the pressure and temperature of the vapor and pumps it toward the condenser

B.It condenses the vapor into a liquid before sending it to the evaporator

C.It reduces the pressure of the vapor so it can boil at a lower temperature

D.It removes heat directly from the room air passing over its casing

Explanation: The compressor draws in low-pressure refrigerant vapor from the evaporator (suction line), mechanically compresses it, and discharges it as a high-pressure, high-temperature vapor toward the condenser, which is what drives the entire refrigeration cycle.

6A technician measures the temperature of refrigerant vapor leaving the evaporator and finds it is higher than the saturation temperature corresponding to the measured suction pressure. What is this temperature difference called?

A.Superheat

B.Subcooling

C.Latent heat

D.Ambient temperature rise

Explanation: Superheat is the number of degrees a vapor's actual temperature is above its saturation temperature at the same pressure. Measuring superheat at the evaporator outlet confirms that all the liquid refrigerant has boiled off before reaching the compressor.

7Liquid refrigerant leaving the condenser is measured at a temperature lower than the saturation temperature that corresponds to the measured discharge/condensing pressure. What is this condition called?

A.Subcooling

B.Superheat

C.Flash gas

D.Refrigerant starvation

Explanation: Subcooling describes liquid refrigerant that has been cooled below its saturation temperature at the existing pressure. A healthy amount of subcooling at the condenser outlet helps ensure only liquid, not vapor, reaches the expansion device.

8Why is refrigerant able to absorb a large amount of heat in the evaporator while its temperature stays almost constant?

A.It absorbs latent heat while changing state from liquid to vapor at constant pressure

B.It absorbs sensible heat while remaining entirely in the liquid state

C.The compressor continuously adds heat energy to the evaporator coil

D.The refrigerant chemically reacts with the air passing over the coil

Explanation: As refrigerant boils in the evaporator, it absorbs latent heat of vaporization while changing from liquid to vapor at a nearly constant temperature and pressure. This large latent heat absorption is what makes the evaporator so effective at cooling.

9As the pressure of a refrigerant increases, what happens to its saturation (boiling) temperature?

A.It increases

B.It decreases

C.It stays the same regardless of pressure

D.It becomes negative

Explanation: Refrigerants have a direct pressure-temperature relationship: as pressure on the refrigerant rises, the temperature at which it boils or condenses also rises. This relationship is why compressing refrigerant vapor makes it hot enough to condense at normal outdoor temperatures.

10In refrigeration and air conditioning work, approximately how much cooling capacity does one ton of refrigeration represent?

A.About 12,000 BTU per hour

B.About 1,000 BTU per hour

C.About 100,000 BTU per hour

D.About 500 BTU per hour

Explanation: One ton of refrigeration is defined as roughly 12,000 BTU per hour, based on the heat needed to melt one ton of ice in 24 hours. This unit is commonly used to rate the cooling capacity of air conditioners and refrigeration equipment.

About the BTEB Refrigeration & AC Exam Exam

The BTEB National Skill Certificate in Refrigeration & Air Conditioning (RAC) certifies competence in servicing, repairing and installing refrigeration and air conditioning equipment in Bangladesh. The units of competency cover the refrigeration cycle, refrigerants and refrigerant safety, compressors, electrical and electronic controls, window and split air conditioner installation and servicing, domestic refrigerators and deep freezers, tools and tube processing, commercial refrigeration equipment, and workplace safety, alongside a hands-on practical assessment.

Exam sponsor: Bangladesh Technical Education Board (BTEB) / National Skills Development Authority (NSDA). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Competency-Based Training & Assessment (CBT&A) under the National Technical and Vocational Qualifications Framework (NTVQF), combining knowledge checks (written and oral questioning) with a supervised practical demonstration for each unit of competency in Refrigeration & Air Conditioning (RAC), administered by BTEB/NSDA through affiliated technical institutes. The RAC trade is offered across multiple NTVQF levels (from National Prevocational Certificate through National Skill Certificate), each with its own set of units of competency and nominal training hours.

Time Limit

Set by BTEB/NSDA and the registered assessment centre for each unit of competency. Confirm exact timing with your institute.

Passing Score

NTVQF assessment is competency-based: candidates are graded "Competent" or "Not Yet Competent" against the published RAC standard for each unit rather than a single percentage score. Confirm the exact assessment method with your assessment centre.

Exam / Certification Fees

Registration and assessment fees are set by BTEB/NSDA and the enrolling institute and are government-subsidised but change periodically. Confirm the current amount with your institute.

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.

13%

Refrigeration Cycle & Fundamentals

The vapor-compression cycle, compressor/condenser/expansion device/evaporator roles, superheat/subcooling and pressure-temperature relationships.

12%

Refrigerants & Refrigerant Safety

Refrigerant types, ozone depletion and GWP, safe handling, recovery, recycling and retrofitting.

10%

Compressors

Reciprocating, rotary and scroll compressors, hermetic vs semi-hermetic design, winding checks and lubrication.

12%

Electrical & Electronic Controls

Thermostats, overload protectors, relays, capacitors, single/three-phase supply and continuity/insulation testing.

Window & Split AC Installation

Cavity preparation, leveling, condensate drainage, refrigerant line and electrical connections, and evacuation/charging.

10%

Window & Split AC Servicing & Repair

Fault diagnosis, nitrogen pressure testing, gas recharging, airflow checks and performance verification.

Domestic Refrigerators & Deep Freezers

Door gaskets, defrost systems, evacuation/charging and leak testing.

11%

Tools, Tube Processing & Measuring Instruments

Tube cutting, bending, flaring and swaging, brazing/soldering, gauge manifolds, vacuum pumps and leak detectors.

Commercial Refrigeration Equipment

Water coolers, ice cream makers, display freezers, water chillers, cold rooms and mobile refrigeration plant.

Workplace Safety, OSH & Quality Procedures

PPE, waste disposal, fire safety, 5S housekeeping and basic trade mathematics.

Preparing for the BTEB Refrigeration & AC Exam Exam

What You Need to Know

Passing score: NTVQF assessment is competency-based: candidates are graded "Competent" or "Not Yet Competent" against the published RAC standard for each unit rather than a single percentage score. Confirm the exact assessment method with your assessment centre.
Assessment: Competency-Based Training & Assessment (CBT&A) under the National Technical and Vocational Qualifications Framework (NTVQF), combining knowledge checks (written and oral questioning) with a supervised practical demonstration for each unit of competency in Refrigeration & Air Conditioning (RAC), administered by BTEB/NSDA through affiliated technical institutes. The RAC trade is offered across multiple NTVQF levels (from National Prevocational Certificate through National Skill Certificate), each with its own set of units of competency and nominal training hours.
Time limit: Set by BTEB/NSDA and the registered assessment centre for each unit of competency. Confirm exact timing with your institute.
Exam / certification fees: Registration and assessment fees are set by BTEB/NSDA and the enrolling institute and are government-subsidised but change periodically. Confirm the current amount with your institute. Official sources

Using Our Practice Resources

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BTEB Refrigeration & AC Exam: Suggested Study Strategy

1Learn the four-component refrigeration cycle (compressor, condenser, expansion device, evaporator) cold, since almost every fault-finding and servicing question assumes you know which component does what and where pressures should be high or low.

2Pair each theory topic with hands-on practice in the workshop, such as brazing a joint, checking a compressor's winding resistance, or evacuating and charging a sealed system, since BTEB/NSDA's CBT&A model assesses practical competence alongside knowledge.

3Always observe safe refrigerant-handling practice and use the correct tool for each job, for example PPE and a recovery machine when removing refrigerant, a leak detector for pinpointing leaks, and a gauge manifold for pressure checks, since safety and correct tool use are directly assessed.

Frequently Asked Questions

Who awards the BTEB Refrigeration & AC certificate and what does it cover?

The Bangladesh Technical Education Board (BTEB), together with the National Skills Development Authority (NSDA), awards the National Skill Certificate in Refrigeration & Air Conditioning (RAC) under the National Technical and Vocational Qualifications Framework (NTVQF), through affiliated technical and vocational institutes. It certifies competence in servicing, repairing and installing refrigeration and air conditioning equipment, covering both trade theory and a hands-on practical assessment.

Is the BTEB Refrigeration & AC assessment only multiple-choice?

No. BTEB/NSDA uses Competency-Based Training & Assessment (CBT&A), which combines knowledge checks (written or oral questioning) with a supervised practical demonstration for each unit of competency. This free bank focuses on the underpinning trade-theory knowledge with 100 multiple-choice questions to help you revise.

How many questions are in this practice bank and what topics does it cover?

This free bank has 100 multiple-choice questions covering the refrigeration cycle, refrigerants and refrigerant safety, compressors, electrical and electronic controls, window and split air conditioner installation and servicing, domestic refrigerators and deep freezers, tools and tube processing, commercial refrigeration equipment, and workplace safety and OSH.

What pass mark do I need for the BTEB Refrigeration & AC trade-theory exam?

NTVQF assessment is competency-based rather than percentage-graded: candidates are assessed as "Competent" or "Not Yet Competent" against the published RAC competency standard for each unit. BTEB/NSDA does not publish a single fixed percentage for this qualification, so confirm the exact assessment method with your enrolling institute or assessment centre.