1. What is the minimum working space width required in front of electrical
equipment rated 150 volts to ground?
• A) 24 inches
• B) 30 inches
• C) 36 inches
• D) 42 inches
ANSWER : B) 30 inches
2. What is the maximum ampacity of a 12 AWG copper conductor with
THHN insulation at 75°C?
• A) 15 amps
• B) 20 amps
• C) 25 amps
• D) 30 amps
ANSWER : C) 25 amps
3. According to DC regulations, what is the minimum height for outdoor
condensing units above ground level?
• A) 3 inches
• B) 6 inches
• C) 12 inches
• D) 18 inches
ANSWER : B) 6 inches
4. What is the required minimum circuit ampacity for a hermetic motor
compressor with a rated load current of 20 amps?
, • A) 20 amps
• B) 23 amps
• C) 25 amps
• D) 30 amps
ANSWER : C) 25 amps (125% of rated load)
5. Which refrigerant has an ODP (Ozone Depletion Potential) of zero?
• A) R-22
• B) R-410A
• C) R-12
• D) R-502
ANSWER : B) R-410A
6. What is the maximum pressure relief valve setting for R-410A residential
systems?
• A) 450 psig
• B) 550 psig
• C) 650 psig
• D) 750 psig
ANSWER : C) 650 psig
7. What PPE is required when handling refrigerants?
• A) Safety glasses only
• B) Gloves only
• C) Safety glasses and gloves
• D) No PPE required
ANSWER : C) Safety glasses and gloves
8. What is the minimum size copper tubing allowed for liquid line on a 3-
ton residential split system?
• A) 1/4 inch
• B) 3/8 inch
, • C) 1/2 inch
• D) 5/8 inch
ANSWER : B) 3/8 inch
9. At what temperature must a low-ambient control maintain head
pressure?
• A) 100-150 psig
• B) 150-200 psig
• C) 200-250 psig
• D) 250-300 psig
ANSWER : C) 200-250 psig
10. What is the maximum allowable voltage drop for branch circuits in
HVAC equipment?
• A) 2%
• B) 3%
• C) 5%
• D) 10%
ANSWER : B) 3%
11. How often must EPA Type II certification holders recertify?
• A) Every year
• B) Every 3 years
• C) Every 5 years
• D) No recertification required
ANSWER : D) No recertification required
12. What is the minimum clearance required around a residential furnace
for service access?
• A) 18 inches
• B) 24 inches
• C) 30 inches
, • D) 36 inches
ANSWER : C) 30 inches
13. What type of disconnect is required for outdoor condensing units?
• A) Circuit breaker only
• B) Fused disconnect
• C) Non-fused disconnect within sight
• D) Either B or C
ANSWER : D) Either B or C
14. What is the required evacuation level for R-410A systems?
• A) 250 microns
• B) 500 microns
• C) 1000 microns
• D) 1500 microns
ANSWER : B) 500 microns
15. What is the minimum burial depth for direct burial cable in residential
areas?
• A) 12 inches
• B) 18 inches
• C) 24 inches
• D) 30 inches
ANSWER : C) 24 inches
16. What is the combustion air requirement for naturally aspirated gas
furnaces per 1000 BTU/hr input?
• A) 25 CFM
• B) 35 CFM
• C) 50 CFM
• D) 75 CFM
ANSWER : C) 50 CFM
equipment rated 150 volts to ground?
• A) 24 inches
• B) 30 inches
• C) 36 inches
• D) 42 inches
ANSWER : B) 30 inches
2. What is the maximum ampacity of a 12 AWG copper conductor with
THHN insulation at 75°C?
• A) 15 amps
• B) 20 amps
• C) 25 amps
• D) 30 amps
ANSWER : C) 25 amps
3. According to DC regulations, what is the minimum height for outdoor
condensing units above ground level?
• A) 3 inches
• B) 6 inches
• C) 12 inches
• D) 18 inches
ANSWER : B) 6 inches
4. What is the required minimum circuit ampacity for a hermetic motor
compressor with a rated load current of 20 amps?
, • A) 20 amps
• B) 23 amps
• C) 25 amps
• D) 30 amps
ANSWER : C) 25 amps (125% of rated load)
5. Which refrigerant has an ODP (Ozone Depletion Potential) of zero?
• A) R-22
• B) R-410A
• C) R-12
• D) R-502
ANSWER : B) R-410A
6. What is the maximum pressure relief valve setting for R-410A residential
systems?
• A) 450 psig
• B) 550 psig
• C) 650 psig
• D) 750 psig
ANSWER : C) 650 psig
7. What PPE is required when handling refrigerants?
• A) Safety glasses only
• B) Gloves only
• C) Safety glasses and gloves
• D) No PPE required
ANSWER : C) Safety glasses and gloves
8. What is the minimum size copper tubing allowed for liquid line on a 3-
ton residential split system?
• A) 1/4 inch
• B) 3/8 inch
, • C) 1/2 inch
• D) 5/8 inch
ANSWER : B) 3/8 inch
9. At what temperature must a low-ambient control maintain head
pressure?
• A) 100-150 psig
• B) 150-200 psig
• C) 200-250 psig
• D) 250-300 psig
ANSWER : C) 200-250 psig
10. What is the maximum allowable voltage drop for branch circuits in
HVAC equipment?
• A) 2%
• B) 3%
• C) 5%
• D) 10%
ANSWER : B) 3%
11. How often must EPA Type II certification holders recertify?
• A) Every year
• B) Every 3 years
• C) Every 5 years
• D) No recertification required
ANSWER : D) No recertification required
12. What is the minimum clearance required around a residential furnace
for service access?
• A) 18 inches
• B) 24 inches
• C) 30 inches
, • D) 36 inches
ANSWER : C) 30 inches
13. What type of disconnect is required for outdoor condensing units?
• A) Circuit breaker only
• B) Fused disconnect
• C) Non-fused disconnect within sight
• D) Either B or C
ANSWER : D) Either B or C
14. What is the required evacuation level for R-410A systems?
• A) 250 microns
• B) 500 microns
• C) 1000 microns
• D) 1500 microns
ANSWER : B) 500 microns
15. What is the minimum burial depth for direct burial cable in residential
areas?
• A) 12 inches
• B) 18 inches
• C) 24 inches
• D) 30 inches
ANSWER : C) 24 inches
16. What is the combustion air requirement for naturally aspirated gas
furnaces per 1000 BTU/hr input?
• A) 25 CFM
• B) 35 CFM
• C) 50 CFM
• D) 75 CFM
ANSWER : C) 50 CFM
