Question 1
Calculate the air volume based upon these conditions:
90,000 BTUH output
Return air temperature: 70F
Supply air temperature: 110F
A. 1,158 CFM
B. 1,500 CFM
C. 1,800 CFM
D. 2,083 CFM
CORRECT ANSWER
D (2,083 CFM)
Question 2
When measuring CFM using temperature rise method, the furnace blower motor speed
should be in:
A. Continuous fan speed
B. Cool mode speed
C. Heat mode speed
CORRECT ANSWER
1
@THE STUDY VAULT
, B (Cool mode speed)
Question 3
If a single phase electric heat section is supplied with 225 volts and is drawing 45 AMPS,
the BTUH output of the heat section is:
A. 34,500 BTUH
B. 25,000 BTUH
C. 45,000 BTUH
CORRECT ANSWER
A (34,500 BTUH)
Question 4
When measuring temperature rise, take the supply air temperature directly in line with
the heater section of the air handler:
A. True
B. False
CORRECT ANSWER
B (False)
Question 5
When measuring external static pressure, the high port of the pressure gauge should be
placed in the duct system to sense:
2
@THE STUDY VAULT
, A. Supply air pressure
B. Return air pressure
CORRECT ANSWER
A (Supply air pressure)
Question 6
When the external static pressure rises, the delivered air volume will:
A. Increase
B. Decrease
CORRECT ANSWER
B (Decrease)
Question 7
When measuring external static pressure on a gas furnace that utilizes an evaporator coil,
the supply air static pressure should be taken at:
A. The inlet to the evaporator
B. The outlet of the evaporator
CORRECT ANSWER
A (The inlet to the evaporator)
Question 8
The pressure gauge used to sense external static pressure in a residential duct system
should have a pressure range scale of:
3
@THE STUDY VAULT
Calculate the air volume based upon these conditions:
90,000 BTUH output
Return air temperature: 70F
Supply air temperature: 110F
A. 1,158 CFM
B. 1,500 CFM
C. 1,800 CFM
D. 2,083 CFM
CORRECT ANSWER
D (2,083 CFM)
Question 2
When measuring CFM using temperature rise method, the furnace blower motor speed
should be in:
A. Continuous fan speed
B. Cool mode speed
C. Heat mode speed
CORRECT ANSWER
1
@THE STUDY VAULT
, B (Cool mode speed)
Question 3
If a single phase electric heat section is supplied with 225 volts and is drawing 45 AMPS,
the BTUH output of the heat section is:
A. 34,500 BTUH
B. 25,000 BTUH
C. 45,000 BTUH
CORRECT ANSWER
A (34,500 BTUH)
Question 4
When measuring temperature rise, take the supply air temperature directly in line with
the heater section of the air handler:
A. True
B. False
CORRECT ANSWER
B (False)
Question 5
When measuring external static pressure, the high port of the pressure gauge should be
placed in the duct system to sense:
2
@THE STUDY VAULT
, A. Supply air pressure
B. Return air pressure
CORRECT ANSWER
A (Supply air pressure)
Question 6
When the external static pressure rises, the delivered air volume will:
A. Increase
B. Decrease
CORRECT ANSWER
B (Decrease)
Question 7
When measuring external static pressure on a gas furnace that utilizes an evaporator coil,
the supply air static pressure should be taken at:
A. The inlet to the evaporator
B. The outlet of the evaporator
CORRECT ANSWER
A (The inlet to the evaporator)
Question 8
The pressure gauge used to sense external static pressure in a residential duct system
should have a pressure range scale of:
3
@THE STUDY VAULT
