NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam - NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam

Question 1

During a manifold gauge test on an R-134a system at an 85°F (29°C) ambient temperature, the low-side reads 10 psi and the high-side reads 110 psi. What is the most likely cause?

The system is undercharged with refrigerant. The system is overcharged with refrigerant. The condenser fan motor has failed. The compressor reed valves are broken.

Correct Answer:

The system is undercharged with refrigerant.

Question 2

What physical change occurs to the refrigerant as it passes through the condenser in an automobile air conditioning system?

It changes from a high-pressure gas to a high-pressure liquid. It changes from a low-pressure liquid to a low-pressure gas. It changes from a high-pressure liquid to a low-pressure liquid. It changes from a low-pressure gas to a high-pressure gas.

Correct Answer:

It changes from a high-pressure gas to a high-pressure liquid.

Question 3

A technician notices that an A/C system's low-side pressure is 55 psi and the high-side is 120 psi while the compressor is running. When the engine speed is increased, the pressures barely change. What is the most likely diagnosis?

The compressor has failed internally and has low pumping efficiency. The expansion valve is restricted or stuck closed. The system has a severe restriction in the liquid line. The condenser airflow is blocked.

Correct Answer:

The compressor has failed internally and has low pumping efficiency.

Question 4

Where should the sensing bulb of a Thermostatic Expansion Valve (TXV) be mounted for proper system operation?

On the evaporator outlet pipe, insulated and positioned at the 10 o'clock or 2 o'clock position. On the evaporator inlet pipe, exposed to the ambient airflow. On the compressor discharge line, close to the condenser inlet. Directly inside the receiver-drier container, submerged in liquid refrigerant.

Correct Answer:

On the evaporator outlet pipe, insulated and positioned at the 10 o'clock or 2 o'clock position.

Question 5

Which A/C system component is designed specifically to prevent liquid refrigerant slugging from entering the compressor suction port in an orifice tube system?

The accumulator The receiver-drier The thermostatic expansion valve The liquid line sight glass

Correct Answer:

The accumulator

Exam overview

About this Exam

Prepare with the NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam practice quiz. This question bank includes 100 questions covering technician, compressor, pressure, high-side, and refrigerant. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam

This practice set contains 100 questions from the matching question bank and focuses on technician, compressor, pressure, high-side, and refrigerant. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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NVQ L4 Automobile AC Technician Practice Questions - Sri Lanka NVQ Level 4 Automobile Air Conditioning Technician Written Examination Exam

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