OK HVAC JOURNEYMAN TEST EXAM QUESTIONS WITH
COMPLETE SOLUTIONS VERIFIED 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
C- leaky suction 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
B- 1,000 CFM (IMC - Table 403.3.1.1 , lists darkrooms at 1.0CFM/Sq-ft. Therefore,
calculate; 1.0CFM/Sq-ft x 1000 Sq-ft = 1,000CFM)
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
D- 14 inch diameter (ACCA Ductulator (duct slide rule) align 0.095 on galvanized metal
duct /w 1000CFM = 14" round duct. 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
C- 225CFM (IMC - TABLE 403.3.1.1
The Manual J specific heat formula used for changing the temperature is
CFM=BTUh/(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
deg F to a warm temperature of 80 deg F (without and altitude correction factor)?
A- 8573 BTUh
B- 7824 BTUh
C- 6660 BTUh
D- 5231 BTUh
C- 6660 BTUh (BTUh= 120CFM x 50deg F x 1.08 = 6480BTUh)
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
B- portable, power-driven circular saws
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
A- 24 (IMC - TABLE 603.4 lists the required aluminum thickness of 0.018 inches
minimum, for a round duct less than 12 inches diameter. 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 duct (0.0201 inches).
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
C- Schedule 40 (IMC - 1107.5.1)
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
D- 10 feet (IFGC - 618.4(1))
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
B- 900CFM (15,000Sq-ft x 0.06cfm)
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
, B- must be attached independently of the scaffold
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)/(hrft degrees F)
B- (square foot degrees F)/(BTU/h)
C- (hr square foot degrees F)/(BTU)
D- (BTU)/(hr square foot degrees F)
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
B- 10 feet (IMC - 401.4)
What is the maximum size annealed copper tubing?
A- 1 1/2 inch
B- 1 inch
C- 7/8 inch
D- 2 inches
D- 2 inches (IMC - 1107.5.3)
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
C- confined space (IFGC - 304.5.1)
COMPLETE SOLUTIONS VERIFIED 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
C- leaky suction 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
B- 1,000 CFM (IMC - Table 403.3.1.1 , lists darkrooms at 1.0CFM/Sq-ft. Therefore,
calculate; 1.0CFM/Sq-ft x 1000 Sq-ft = 1,000CFM)
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
D- 14 inch diameter (ACCA Ductulator (duct slide rule) align 0.095 on galvanized metal
duct /w 1000CFM = 14" round duct. 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
C- 225CFM (IMC - TABLE 403.3.1.1
The Manual J specific heat formula used for changing the temperature is
CFM=BTUh/(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
deg F to a warm temperature of 80 deg F (without and altitude correction factor)?
A- 8573 BTUh
B- 7824 BTUh
C- 6660 BTUh
D- 5231 BTUh
C- 6660 BTUh (BTUh= 120CFM x 50deg F x 1.08 = 6480BTUh)
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
B- portable, power-driven circular saws
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
A- 24 (IMC - TABLE 603.4 lists the required aluminum thickness of 0.018 inches
minimum, for a round duct less than 12 inches diameter. 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 duct (0.0201 inches).
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
C- Schedule 40 (IMC - 1107.5.1)
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
D- 10 feet (IFGC - 618.4(1))
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
B- 900CFM (15,000Sq-ft x 0.06cfm)
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
, B- must be attached independently of the scaffold
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)/(hrft degrees F)
B- (square foot degrees F)/(BTU/h)
C- (hr square foot degrees F)/(BTU)
D- (BTU)/(hr square foot degrees F)
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
B- 10 feet (IMC - 401.4)
What is the maximum size annealed copper tubing?
A- 1 1/2 inch
B- 1 inch
C- 7/8 inch
D- 2 inches
D- 2 inches (IMC - 1107.5.3)
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
C- confined space (IFGC - 304.5.1)
