HVAC JOURNEYMAN EXAM PREP TEST 250
QUESTIONS AND CORRECT DETAILED
ANSWERS TOP RATED STUDY GUIDE
GRADED A+
⩥ 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).
Answer: 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
⩥ D- 14 inch diameter (ACCA Ductulator (duct slide rule) align 0.095
on galvanized metal duct /w 1000CFM = 14" round duct. 14 inch
diameter).
Answer: 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
⩥ C- 225CFM (IMC - TABLE 403.3.1.1.
Answer: 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- 6660 BTUh (BTUh= 120CFM x 50deg F x 1.08 = 6480BTUh).
Answer: 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
⩥ B- portable, power-driven circular saws.
Answer: 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- 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)..
Answer: 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
⩥ C- Schedule 40 (IMC - 1107.5.1).
, Answer: 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
⩥ D- 10 feet (IFGC - 618.4(1)).
Answer: 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
⩥ B- 900CFM (15,000Sq-ft x 0.06cfm).
Answer: 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
QUESTIONS AND CORRECT DETAILED
ANSWERS TOP RATED STUDY GUIDE
GRADED A+
⩥ 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).
Answer: 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
⩥ D- 14 inch diameter (ACCA Ductulator (duct slide rule) align 0.095
on galvanized metal duct /w 1000CFM = 14" round duct. 14 inch
diameter).
Answer: 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
⩥ C- 225CFM (IMC - TABLE 403.3.1.1.
Answer: 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- 6660 BTUh (BTUh= 120CFM x 50deg F x 1.08 = 6480BTUh).
Answer: 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
⩥ B- portable, power-driven circular saws.
Answer: 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- 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)..
Answer: 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
⩥ C- Schedule 40 (IMC - 1107.5.1).
, Answer: 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
⩥ D- 10 feet (IFGC - 618.4(1)).
Answer: 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
⩥ B- 900CFM (15,000Sq-ft x 0.06cfm).
Answer: 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
