Page 1 of 91
Ohio HVAC Contractor Exam ACTUAL EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS LATEST UPDATE THIS
YEAR
SHORT POINT-FORM COVERAGE
• Refrigeration cycle basics
• Heating & cooling systems
• Airflow & duct design
• Electrical controls
• Refrigerants & EPA rules
• Installation & troubleshooting
• Load calculations (Manual J)
• Gas systems & combustion
• Safety & Ohio codes
• Business practices
, Page 2 of 91
1.
A technician observes a refrigeration system where the evaporator coil is not absorbing enough heat.
What is the most likely cause?
A. High condenser pressure
B. Low refrigerant charge
C. High airflow
D. Proper operation
Answer: B
Rationale: Low refrigerant reduces heat absorption.
2.
A gas furnace fails to ignite during startup. What is the most likely issue preventing ignition?
A. High airflow
B. Faulty ignition system or gas supply
C. High refrigerant
D. Low pressure
Answer: B
Rationale: Ignition depends on gas and spark.
3.
, Page 3 of 91
A technician measures high superheat in a system. What condition does this indicate?
A. Overcharged system
B. Undercharged or restricted system
C. Proper operation
D. High airflow
Answer: B
Rationale: High superheat means low refrigerant.
4.
A contractor installs undersized ductwork in a building. What is the most likely result?
A. Improved airflow
B. Reduced airflow and increased static pressure
C. Increased cooling
D. Lower energy use
Answer: B
Rationale: Small ducts restrict airflow.
5.
A system shows low subcooling readings. What does this typically indicate?
A. Overcharged system
B. Undercharged system
, Page 4 of 91
C. Proper system
D. High airflow
Answer: B
Rationale: Low subcooling = insufficient refrigerant.
6.
A technician installs a capacitor with incorrect rating. What is the likely consequence?
A. Improved efficiency
B. Motor malfunction or failure
C. Increased airflow
D. Lower pressure
Answer: B
Rationale: Capacitors control motor startup.
7.
A furnace produces excessive carbon monoxide. What is the most likely cause?
A. Proper combustion
B. Incomplete combustion due to poor airflow
C. High refrigerant
D. Low pressure
Ohio HVAC Contractor Exam ACTUAL EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS LATEST UPDATE THIS
YEAR
SHORT POINT-FORM COVERAGE
• Refrigeration cycle basics
• Heating & cooling systems
• Airflow & duct design
• Electrical controls
• Refrigerants & EPA rules
• Installation & troubleshooting
• Load calculations (Manual J)
• Gas systems & combustion
• Safety & Ohio codes
• Business practices
, Page 2 of 91
1.
A technician observes a refrigeration system where the evaporator coil is not absorbing enough heat.
What is the most likely cause?
A. High condenser pressure
B. Low refrigerant charge
C. High airflow
D. Proper operation
Answer: B
Rationale: Low refrigerant reduces heat absorption.
2.
A gas furnace fails to ignite during startup. What is the most likely issue preventing ignition?
A. High airflow
B. Faulty ignition system or gas supply
C. High refrigerant
D. Low pressure
Answer: B
Rationale: Ignition depends on gas and spark.
3.
, Page 3 of 91
A technician measures high superheat in a system. What condition does this indicate?
A. Overcharged system
B. Undercharged or restricted system
C. Proper operation
D. High airflow
Answer: B
Rationale: High superheat means low refrigerant.
4.
A contractor installs undersized ductwork in a building. What is the most likely result?
A. Improved airflow
B. Reduced airflow and increased static pressure
C. Increased cooling
D. Lower energy use
Answer: B
Rationale: Small ducts restrict airflow.
5.
A system shows low subcooling readings. What does this typically indicate?
A. Overcharged system
B. Undercharged system
, Page 4 of 91
C. Proper system
D. High airflow
Answer: B
Rationale: Low subcooling = insufficient refrigerant.
6.
A technician installs a capacitor with incorrect rating. What is the likely consequence?
A. Improved efficiency
B. Motor malfunction or failure
C. Increased airflow
D. Lower pressure
Answer: B
Rationale: Capacitors control motor startup.
7.
A furnace produces excessive carbon monoxide. What is the most likely cause?
A. Proper combustion
B. Incomplete combustion due to poor airflow
C. High refrigerant
D. Low pressure
