HVAC JOURNEYMAN EXAM 2024 AND
PRACTICE EXAM LATEST VERSION WITH 100
CORRECT QUESTIONS AND DETAILED
ANSWERS ALREADY GRADED A+
A deep vacuum is an evacuation method in which a technician uses a vacuum pump (or
the systems compressor) to pull a vacuum until no moisture or other vapor remains in
the system. If the compressor is used for this procedure, but CANNOT produce a deep
vacuum, which of the following would be the problem?
A- Bad TXV
B- Low refrigerant
C- Leaky suction valve
D- Leaky exhaust valve
- What would be the minimum ventilation exhaust flow rate for a 1,000 Sq-ft darkroom?
The ventilation system must be designed to supply the required rate of ventilation air
continuously during the period the building is occupied "24/7".
A- 10,000 CFM
B- 1,000 CFM
C- 180 CFM
D- 120 CFM
Use a duct slide rule to determine required round steel duct size for a sheet metal duct
system showing a pressure drop of 0.25 IWC, delivers 1,000CFM, has a total effective
length of 263 feet, and a friction rate of 0.095 IWC/100.
A- 12 inch diameter
B- 10 inch diameter
C- 16 inch diameter
,D- 14 inch diameter
What is the minimum required outdoor ventilation rate for a residence with three
bedrooms, the bathrooms, one kitchen, and a 133 square foot one-car garage?
(Assume continuous exhaust for kitchen and bathrooms.)
A- 115 CFM
B- 175 CFM
C- 225 CFM
D- 295 CFM
The Manual J specific heat formula used for changing the temperature is
CFM=But/(1.08 x Change Temperature). Therefore, what would be the required heat
input in BTUs to raise air quantity of 120CFM from the cold temperature of 30 dig F to a
warm temperature of 80 dig F (without and altitude correction factor)?
A- 8573 But
B- 7824 But
C- 6660 But
D- 5231 B
According to OSHA, upper and lower guards shall be equipped on...
A- Grinding machines
B- Portable, power-driven circular saws
C- hand-fed crosscut table saws
D- hand-fed ripsaws
A standard sheet metal thickness gauge table will list the thickness of 24 gauge
aluminum as 0.0201 inches, and the thickness of 26 gauge aluminum as 0.0159 inches
(too thin). Correct multiple choice answer is 24 gauge aluminum ducts (0.0201 inches).
In a residential building, the minimum wall thickness of an 8-inch round aluminum duct
must be what minimum gauge thickness?
A- 24
B- 26
,C- 28
D- 30
Carbon steel pipe with a wall thickness not less than __ shall be used for Group A1
refrigerant liquid lines 6 inches and smaller.
A- FMT
B- EMT
C- Schedule 40
D- Schedule 80
A plumbing vent outlet is discharging 2 feet above a forced- warm- air furnace outside
air inlet. What is the minimum distance that the outside air inlet shall be from the vent
outlet?
A- 12 feet
B- 20 feet
C- 15 feet
D- 10 feet
A contractor must build a 15,000 square foot educational auditorium. What would be the
minimum outdoor ventilation in CFM?
A- 1,200CFM
B- 900CFM
C- 750CFM
D- 624CFM
Which of the following statements are true about the installation of vertical lifelines,
independent support lines, and suspension ropes?
A- Must be attached to the same point on the scaffold
B- Must be attached independently of the scaffold
C- Must be attached to each other
D- Must be the same point of anchorage
, The symbol "k" stands for the thermal transmission by conduction. Trying to solve for "k"
for a 1 inch thickness of homogeneous material, the result will be measured in __\__.
A- (BTU)/(heft degrees F)
B- (square foot degrees F)/ (BTU/h)
C- (hr. square foot degrees F)/ (BTU)
D- (BTU)/(hr. square foot degrees F)
A cooling system with a sewer vent concluding at 18 inches above the intake shall have
MINIMUM horizontal distance between the sewer vent and fresh air intake of __ feet.
A- No minimum distance is required
B- 10 feet
C- 5 feet
D- 2 feet
What is the maximum size annealed copper tubing?
A- 1 1/2 inch
B- 1 inch
C- 7/8 inch
D- 2 inches
What should be called a room where fuel-burning appliances are working and it's
volume is NO MORE than 50 cubic feet per 1,000 BTU/h of input rating?
A- Boiler room
B- Furnace room
C- Confined space
D- Mechanical room
A- 110 sq in (IFGC - 304.5.3.1) - answer- An appliance has a demand of 110,000
BTU/h. It is using indoor air for combustion air. What is the minimum net free area of
each opening?
A- 110 sq in
PRACTICE EXAM LATEST VERSION WITH 100
CORRECT QUESTIONS AND DETAILED
ANSWERS ALREADY GRADED A+
A deep vacuum is an evacuation method in which a technician uses a vacuum pump (or
the systems compressor) to pull a vacuum until no moisture or other vapor remains in
the system. If the compressor is used for this procedure, but CANNOT produce a deep
vacuum, which of the following would be the problem?
A- Bad TXV
B- Low refrigerant
C- Leaky suction valve
D- Leaky exhaust valve
- What would be the minimum ventilation exhaust flow rate for a 1,000 Sq-ft darkroom?
The ventilation system must be designed to supply the required rate of ventilation air
continuously during the period the building is occupied "24/7".
A- 10,000 CFM
B- 1,000 CFM
C- 180 CFM
D- 120 CFM
Use a duct slide rule to determine required round steel duct size for a sheet metal duct
system showing a pressure drop of 0.25 IWC, delivers 1,000CFM, has a total effective
length of 263 feet, and a friction rate of 0.095 IWC/100.
A- 12 inch diameter
B- 10 inch diameter
C- 16 inch diameter
,D- 14 inch diameter
What is the minimum required outdoor ventilation rate for a residence with three
bedrooms, the bathrooms, one kitchen, and a 133 square foot one-car garage?
(Assume continuous exhaust for kitchen and bathrooms.)
A- 115 CFM
B- 175 CFM
C- 225 CFM
D- 295 CFM
The Manual J specific heat formula used for changing the temperature is
CFM=But/(1.08 x Change Temperature). Therefore, what would be the required heat
input in BTUs to raise air quantity of 120CFM from the cold temperature of 30 dig F to a
warm temperature of 80 dig F (without and altitude correction factor)?
A- 8573 But
B- 7824 But
C- 6660 But
D- 5231 B
According to OSHA, upper and lower guards shall be equipped on...
A- Grinding machines
B- Portable, power-driven circular saws
C- hand-fed crosscut table saws
D- hand-fed ripsaws
A standard sheet metal thickness gauge table will list the thickness of 24 gauge
aluminum as 0.0201 inches, and the thickness of 26 gauge aluminum as 0.0159 inches
(too thin). Correct multiple choice answer is 24 gauge aluminum ducts (0.0201 inches).
In a residential building, the minimum wall thickness of an 8-inch round aluminum duct
must be what minimum gauge thickness?
A- 24
B- 26
,C- 28
D- 30
Carbon steel pipe with a wall thickness not less than __ shall be used for Group A1
refrigerant liquid lines 6 inches and smaller.
A- FMT
B- EMT
C- Schedule 40
D- Schedule 80
A plumbing vent outlet is discharging 2 feet above a forced- warm- air furnace outside
air inlet. What is the minimum distance that the outside air inlet shall be from the vent
outlet?
A- 12 feet
B- 20 feet
C- 15 feet
D- 10 feet
A contractor must build a 15,000 square foot educational auditorium. What would be the
minimum outdoor ventilation in CFM?
A- 1,200CFM
B- 900CFM
C- 750CFM
D- 624CFM
Which of the following statements are true about the installation of vertical lifelines,
independent support lines, and suspension ropes?
A- Must be attached to the same point on the scaffold
B- Must be attached independently of the scaffold
C- Must be attached to each other
D- Must be the same point of anchorage
, The symbol "k" stands for the thermal transmission by conduction. Trying to solve for "k"
for a 1 inch thickness of homogeneous material, the result will be measured in __\__.
A- (BTU)/(heft degrees F)
B- (square foot degrees F)/ (BTU/h)
C- (hr. square foot degrees F)/ (BTU)
D- (BTU)/(hr. square foot degrees F)
A cooling system with a sewer vent concluding at 18 inches above the intake shall have
MINIMUM horizontal distance between the sewer vent and fresh air intake of __ feet.
A- No minimum distance is required
B- 10 feet
C- 5 feet
D- 2 feet
What is the maximum size annealed copper tubing?
A- 1 1/2 inch
B- 1 inch
C- 7/8 inch
D- 2 inches
What should be called a room where fuel-burning appliances are working and it's
volume is NO MORE than 50 cubic feet per 1,000 BTU/h of input rating?
A- Boiler room
B- Furnace room
C- Confined space
D- Mechanical room
A- 110 sq in (IFGC - 304.5.3.1) - answer- An appliance has a demand of 110,000
BTU/h. It is using indoor air for combustion air. What is the minimum net free area of
each opening?
A- 110 sq in
