100+ Free RAC Servicing (DomRAC) NC II Practice Questions

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Key Facts: RAC Servicing (DomRAC) NC II Exam

₱500

Sched. Assessment Fee

TESDA Circular cost schedules

HVCDRA221

Qualification Code

TR 2021

Competency

Passing Standard

TESDA

5 years

NC Validity

TESDA

TESDA RAC Servicing (DomRAC) NC II certifies technicians for domestic refrigeration and window-type AC service. Assessment is competency-based. Scholarship schedules list ₱500 assessment fee.

Sample RAC Servicing (DomRAC) NC II Practice Questions

Try these sample questions to test your RAC Servicing (DomRAC) NC II exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the vapor-compression refrigeration cycle used in domestic refrigerators, which component removes heat from the refrigerant and rejects it to room air?

A.Evaporator

B.Condenser

C.Capillary tube

D.Compressor

Explanation: The condenser is the high-pressure heat exchanger where hot refrigerant vapor releases latent and sensible heat to the surrounding air, changing state to liquid. In a domestic fridge the condenser coils are typically on the back or beneath the cabinet.

2A household refrigerator shows frost buildup only on the evaporator coil inside the freezer while the fresh-food section warms. Which fault is most likely?

A.Low refrigerant charge causing partial evaporator flooding

B.Failed defrost heater or defrost timer/control

C.Dirty condenser coils on the rear panel

D.Loose door gasket on the fresh-food door only

Explanation: Heavy frost on the evaporator with poor cooling often indicates the automatic defrost system is not operating—heater, bimetal, timer, or electronic defrost control. Without periodic defrost, airflow through the evaporator is blocked and both freezer and fresh-food temperatures rise.

3Before brazing a leak on a domestic refrigerator sealed system, what must the technician do regarding refrigerant?

A.Vent remaining refrigerant to atmosphere to prevent explosion

B.Recover refrigerant into an approved recovery cylinder using proper equipment

C.Add nitrogen to the system and release it through the service port

D.Charge additional refrigerant to push contaminants out during brazing

Explanation: Refrigerant must be recovered—not vented—before opening or brazing the system. Venting violates environmental regulations and TESDA safe-handling practice. Recovery protects ozone/climate and prevents unsafe release during heat application.

4Which tool is used to measure deep vacuum in microns when dehydrating a domestic refrigerator sealed system after repair?

A.Compound gauge set reading in psig only

B.Electronic vacuum gauge (micron gauge) connected to the system

C.Standard tire pressure gauge

D.Clamp-on ammeter on the compressor lead

Explanation: Dehydration requires pulling a deep vacuum, typically measured in microns with an electronic vacuum gauge. Compound gauges read in inches of mercury or psig and are insufficient for verifying deep vacuum levels required before charging.

5The capillary tube in a domestic refrigerator acts as which type of device?

A.High-side pressure relief valve

B.Constant restriction metering device between condenser and evaporator

C.Oil separator returning lubricant to the crankcase

D.Suction-line filter-drier only

Explanation: A capillary tube is a fixed small-diameter tube that meters refrigerant flow from the high side to the low side, maintaining proper evaporator feed without a moving valve. It is common on small hermetic domestic systems.

6A technician hears continuous compressor running with poor cooling and finds the condenser barely warm and the evaporator sweating heavily. What condition is indicated?

A.Overcharge of refrigerant

B.Restricted capillary tube or filter-drier causing low flow and low-side flooding symptoms

C.Open defrost heater circuit

D.High ambient temperature only

Explanation: A restricted metering device or clogged filter-drier reduces refrigerant flow: compressor runs continuously, condenser stays relatively cool, evaporator may show flooding/wet conditions, and cooling is poor—classic restriction symptoms.

7What is the primary purpose of the door gasket on a domestic refrigerator?

A.Increase compressor displacement for faster pull-down

B.Seal the cabinet to prevent warm moist air infiltration and maintain temperature

C.Filter refrigerant before the evaporator

D.Provide electrical grounding for the metal door

Explanation: Magnetic or compression door gaskets maintain an airtight seal, preventing warm humid air from entering the cabinet. Leaking gaskets cause condensation, frost, long run times, and high energy consumption.

8Which refrigerant is most commonly used in newer domestic refrigerators in the Philippines following global phase-out of CFCs?

A.R-12

B.R-134a

C.R-22

D.R-410A

Explanation: R-134a (HFC-134a) is the standard refrigerant for most domestic refrigeration after R-12 phase-out. R-22 and R-410A are used in air-conditioning applications, not typical domestic fridge sealed systems.

9When leak-testing a domestic refrigerator with nitrogen, what is the correct safe practice?

A.Pressurize above working pressure with oxygen to find small leaks

B.Pressurize with dry nitrogen to a low test pressure using a regulator and soap-bubble or electronic leak detector

C.Use compressed air from a shop line at 150 psi without regulator

D.Add refrigerant and vent slowly while listening for hiss

Explanation: Nitrogen leak testing uses dry nitrogen at controlled low pressure with a regulator. Soap bubbles or electronic detectors locate leaks safely. Oxygen or air with oil can create explosive mixtures; venting refrigerant is prohibited.

10The thermostat in a domestic refrigerator senses temperature at which location in most designs?

A.Condenser outlet line

B.Evaporator or air temperature within the refrigerated compartment via capillary bulb or sensor

C.Compressor discharge line

D.Liquid line before the capillary tube

Explanation: Mechanical thermostats use a capillary bulb clamped to the evaporator or sense compartment air; electronic controls use thermistors in the cabinet. They cycle the compressor to maintain set temperature.

About the RAC Servicing (DomRAC) NC II Exam

National HVAC/R domestic servicing practice covering refrigeration cycle, window AC service, troubleshooting, and electrical/refrigerant safety knowledge.

Assessment

Performance-based assessment

Time Limit

4 to 8 hours

Passing Score

Competency-based

Exam Fee

₱500.00 (TESDA)

RAC Servicing (DomRAC) NC II Exam Content Outline

35%

Domestic Refrigeration Servicing

Service domestic refrigeration units

35%

Window-Type AC Servicing

Service window-type air-conditioning units

20%

Troubleshooting & Repair

Troubleshoot/repair DomRAC systems, recovery/recycling, and test-run

10%

Safety, Electrical & Refrigerants

Electrical safety, refrigerant handling awareness, and tools

How to Pass the RAC Servicing (DomRAC) NC II Exam

What You Need to Know

Passing score: Competency-based
Assessment: Performance-based assessment
Time limit: 4 to 8 hours
Exam fee: ₱500.00

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

RAC Servicing (DomRAC) NC II Study Tips from Top Performers

1Know the basic vapor-compression cycle: compressor, condenser, expansion device, evaporator.

2Review safe refrigerant recovery/recycling concepts and why venting is prohibited.

3Study electrical safety on sealed systems and capacitor discharge caution.

4Practice interpreting common symptoms: no cooling, icing, short cycling.

5Prepare oral answers on vacuuming and leak-check purpose before charging.

Frequently Asked Questions

What is DomRAC NC II?

RAC Servicing (Domestic Refrigeration and Air-Conditioning) NC II—install, service, maintain, troubleshoot, and repair domestic RAC units (TR amended June 8, 2021, code HVCDRA221).

Assessment fee?

TESDA scholarship cost schedules list ₱500.00 assessment fee for DomRAC NC II; verify the exact promulgated fee with your accredited assessment center.

Core competencies?

Service domestic refrigeration units and service window-type air-conditioning units, including troubleshooting/repair and recovery/recycling tasks in the revised TR.

Passing standard?

Competent / Not Yet Competent.

Assessment methods?

Written test plus demonstration/observation with oral questioning.

100+ Free RAC Servicing (DomRAC) NC II Practice Questions

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