NCCER HVAC LEVEL 2 CERTIFICATION EXAM – ACTUAL EXAM PRACTICE
QUESTIONS AND 100% VERIFIED CORRECT ANSWERS | COMPLETE EXAM PREP
TESTBANK | GUARANTEED PASS | INSTANT DOWNLOAD PDF
Core Domains
Chimneys, Vents, and Flues
Hydronic Heating Systems
Air Distribution Systems
Alternating Current (AC)
Basic Maintenance
Compressors
Refrigerants and Oils
Leak Detection, Evacuation, Recovery, and Charging
Metering Devices
Heat Pumps
,Introduction
The NCCER HVAC Level 2 Certification Exam is a comprehensive assessment designed to
evaluate the proficiency of technicians in advanced heating, ventilation, and air conditioning
concepts. This exam assesses technical knowledge across critical areas such as electrical
theory, complex mechanical systems, and environmental compliance. Consisting of 200
multiple-choice questions, the test utilizes both foundational theory and scenario-based
applications to simulate real-world workplace challenges. Candidates must demonstrate an
understanding of practical problem-solving, safety protocols, and professional decision-
making. Passing this exam signifies a mastery of the intermediate skills required for
professional advancement and high-quality service in the HVAC industry.
SECTION 1: QUESTIONS 1-100
1. When testing a capacitor with an ohmmeter, the needle should move toward zero and
then swing back toward infinity. What does it indicate if the needle stays at zero?
A. The capacitor is fully charged.
🔴 B. The capacitor is shorted.
C. The capacitor is open.
D. The capacitor is functioning normally.
🔵 Explanation: If the needle stays at zero ohms, there is no resistance, indicating a
direct internal connection or a shorted component.
,2. Which type of compressor uses a piston that moves up and down inside a cylinder to
compress refrigerant?
🔴 A. Reciprocating
B. Rotary
C. Scroll
D. Centrifugal
🔵 Explanation: Reciprocating compressors utilize a crankshaft-driven piston to draw
in and compress refrigerant vapor.
3. In a parallel circuit containing three resistors, if one resistor burns out, what happens
to the remaining resistors?
A. They stop functioning.
B. They will draw less current.
🔴 C. They continue to operate.
D. The total resistance of the circuit increases to infinity.
🔵 Explanation: In a parallel circuit, each branch provides an independent path for
current; if one branch opens, the others remain energized.
4. A technician is using a vacuum pump to evacuate a system. Which tool is used to
measure the vacuum level in microns?
A. Manifold gauge set
B. Compound gauge
, 🔴 C. Thermistor vacuum gauge
D. High-pressure gauge
🔵 Explanation: A thermistor or electronic vacuum gauge is required to accurately
measure deep vacuums in microns, which standard gauges cannot detect.
5. What is the primary purpose of a filter-drier in a refrigeration system?
A. To increase refrigerant pressure
🔴 B. To remove moisture and contaminants
C. To subcool the liquid refrigerant
D. To regulate the flow of refrigerant
🔵 Explanation: Filter-driers contain desiccant material designed to trap debris and
absorb moisture that could damage the compressor or freeze at the expansion valve.
6. Which metering device uses a sensing bulb to maintain a constant superheat at the
evaporator outlet?
A. Capillary tube
B. Automatic expansion valve
🔴 C. Thermostatic expansion valve (TXV)
D. Fixed orifice
🔵 Explanation: The TXV uses a sensing bulb to monitor temperature and adjust
refrigerant flow to ensure the evaporator maintains a specific superheat.
QUESTIONS AND 100% VERIFIED CORRECT ANSWERS | COMPLETE EXAM PREP
TESTBANK | GUARANTEED PASS | INSTANT DOWNLOAD PDF
Core Domains
Chimneys, Vents, and Flues
Hydronic Heating Systems
Air Distribution Systems
Alternating Current (AC)
Basic Maintenance
Compressors
Refrigerants and Oils
Leak Detection, Evacuation, Recovery, and Charging
Metering Devices
Heat Pumps
,Introduction
The NCCER HVAC Level 2 Certification Exam is a comprehensive assessment designed to
evaluate the proficiency of technicians in advanced heating, ventilation, and air conditioning
concepts. This exam assesses technical knowledge across critical areas such as electrical
theory, complex mechanical systems, and environmental compliance. Consisting of 200
multiple-choice questions, the test utilizes both foundational theory and scenario-based
applications to simulate real-world workplace challenges. Candidates must demonstrate an
understanding of practical problem-solving, safety protocols, and professional decision-
making. Passing this exam signifies a mastery of the intermediate skills required for
professional advancement and high-quality service in the HVAC industry.
SECTION 1: QUESTIONS 1-100
1. When testing a capacitor with an ohmmeter, the needle should move toward zero and
then swing back toward infinity. What does it indicate if the needle stays at zero?
A. The capacitor is fully charged.
🔴 B. The capacitor is shorted.
C. The capacitor is open.
D. The capacitor is functioning normally.
🔵 Explanation: If the needle stays at zero ohms, there is no resistance, indicating a
direct internal connection or a shorted component.
,2. Which type of compressor uses a piston that moves up and down inside a cylinder to
compress refrigerant?
🔴 A. Reciprocating
B. Rotary
C. Scroll
D. Centrifugal
🔵 Explanation: Reciprocating compressors utilize a crankshaft-driven piston to draw
in and compress refrigerant vapor.
3. In a parallel circuit containing three resistors, if one resistor burns out, what happens
to the remaining resistors?
A. They stop functioning.
B. They will draw less current.
🔴 C. They continue to operate.
D. The total resistance of the circuit increases to infinity.
🔵 Explanation: In a parallel circuit, each branch provides an independent path for
current; if one branch opens, the others remain energized.
4. A technician is using a vacuum pump to evacuate a system. Which tool is used to
measure the vacuum level in microns?
A. Manifold gauge set
B. Compound gauge
, 🔴 C. Thermistor vacuum gauge
D. High-pressure gauge
🔵 Explanation: A thermistor or electronic vacuum gauge is required to accurately
measure deep vacuums in microns, which standard gauges cannot detect.
5. What is the primary purpose of a filter-drier in a refrigeration system?
A. To increase refrigerant pressure
🔴 B. To remove moisture and contaminants
C. To subcool the liquid refrigerant
D. To regulate the flow of refrigerant
🔵 Explanation: Filter-driers contain desiccant material designed to trap debris and
absorb moisture that could damage the compressor or freeze at the expansion valve.
6. Which metering device uses a sensing bulb to maintain a constant superheat at the
evaporator outlet?
A. Capillary tube
B. Automatic expansion valve
🔴 C. Thermostatic expansion valve (TXV)
D. Fixed orifice
🔵 Explanation: The TXV uses a sensing bulb to monitor temperature and adjust
refrigerant flow to ensure the evaporator maintains a specific superheat.
