Airflow Measurement
Airflow Measurement
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Question 1 |
A strobe tachometer is used to measure?
A | Air speed |
B | Blower speed |
C | Air volume |
D | Static pressure
|
Question 2 |
A strobe tachometer’s measurements are read in ?
A | Fpm |
B | Rpm |
C | Cfm |
D | Inches W.C |
Question 3 |
A pitot-tube has the capability of measuring
A | Static pressure |
B | Velocity pressure |
C | Velocity and static pressure |
D | Cfm |
Question 4 |
The holes on the side of a pitot-tube are used to measure
A | Static pressure |
B | Velocity pressure |
C | Velocity and static pressure |
D | Total pressure |
Question 5 |
The hole in the end of the pitot-tube is used to measure
A | Static pressure |
B | Velocity pressure |
C | Velocity and static pressure |
D | Total pressure |
Question 6 |
The speed of air in a duct system is measured in
A | cfm - cubic feet per minute |
B | fpm - feet per minute |
C | gpm - gallons per minute |
D | cfh - cubic feet per hour
|
Question 7 |
A pitot-tube traverse is commonly used to
A | take an average air velocity pressure reading in an air distribution system for the calculation of air volume. |
B | Take an average static pressure reading in an air distribution system for the calculation of air velocity. |
C | Take an average air volume reading in an air distribution system for the calculation of air velocity |
D | None of the above
|
Question 8 |
A pitot-tube traverse
A | Must be taken in the main supply and return duct system only |
B | Must be taken in the individual branch runs only |
C | Must be taken in the main supply duct only |
D | Can be taken in the main supply, return, and individual branch runs |
Question 9 |
A velometer measures
A | The quantity of air in a duct system |
B | The speed of the air in a duct system or at a diffuser |
C | The static pressure of the duct system |
D | None of the above
|
Question 10 |
What instrument is commonly used with a velometer to measure the air velocity at a supply register?
A | A pitot-tube |
B | A diffuser probe |
C | An air scoop |
D | A static ring
|
Question 11 |
An anemometer measures
A | Static pressure |
B | Velocity in inches W.C. |
C | Velocity in feet per minute |
D | Quantity of air in cubic feet per minute
|
Question 12 |
What are two common types of anemometers used for airflow testing?
A | A vane type and a pitot type |
B | A hot wire and a vane type |
C | A hot wire type and a pitot tube |
D | None of the above |
Question 13 |
What is considered static pressure in a duct sytem?
A | The speed of the air in the duct system |
B | The pressure of the air flowing down the duct system |
C | The pressure of the air pushing in all direction in a duct system |
D | The total pressure in the duct system
|
Question 14 |
What instrument must be used with a manometer to measure static, velocity, and total pressure?
A | A pitot-tube |
B | An incline gauge |
C | An anemometer |
D | A static disc |
Question 15 |
Which of the following formulas is correct?
A | Static pressure/velocity pressure = total pressure |
B | Velocity pressure – static pressure = total pressure |
C | Velocity pressure X static pressure = total pressure |
D | Static pressure + velocity pressure = total pressure
|
Question 16 |
A U-tube manometer is commonly used to measure pressures
A | Below 1” WC |
B | Above 1” WC |
C | Up to 40” WC |
D | None of the above |
Question 17 |
An incline manometer is commonly used to measure pressures
A | Below 1” WC |
B | Above 1” WC |
C | Up to 40” WC |
D | None of the above
|
Question 18 |
What type of gauge uses a high and low pressure port to measure a pressure difference between two different pressure locations?
A | A high pressure gauge |
B | A low pressure gauge |
C | A differential pressure gauge |
D | A high/low pressure gauge
|
Question 19 |
Air volume is measure in
A | Cfm |
B | Fpm |
C | Inches WC |
D | Inches Hg |
Question 20 |
Which of the following formulas is correct
A | Area + velocity = cfm |
B | Velocity X area = cfm |
C | Velocity/area = cfm |
D | Area – velocity = cfm
|
Question 21 |
If an 8” X 22” supply air duct has air that is travelling at the speed of 1000 fpm. What is the quantity of the air moving through the system?
A | 176,000 cfm |
B | 1,760 cfm |
C | 1,222 cfm |
D | 122 cfm
|
Question 22 |
An 8” X 12" register has a velocity of 300 fpm with free area of 75% what is the quantity of air exiting the register?
A | 1,800 cfm |
B | 2,880 cfm |
C | 200 cfm |
D | 150 cfm
|
Question 23 |
An airhood is commonly used for measuring
A | cfm |
B | fpm |
C | Static pressure |
D | Velocity pressure
|
Question 24 |
Which of the following formulas is correct?
A | Cfm = input BTUH / 1.08 X temperature difference |
B | Cfm = output BTUH X 1.08 X temperature difference |
C | Cfm = input BTUH / 1.08 + temperature difference |
D | Cfm = output BTUH / 1.08 X temperature difference |
Question 25 |
If the temperature difference across a heat exchanger is 70 degrees and the output of a furnace is 82,000 BTUH what would be the cfm of the blower?
A | 950 cfm |
B | 1,045 cfm |
C | 1,085 cfm |
D | 1,125 cfm |
Question 26 |
At what speed does the blower have to be set for the temperature rise test?
A | Low |
B | Med |
C | High |
D | The heat cycle will set the speed |
Question 27 |
Return air temperature is 70 degrees, supply is 130. When clocking the gas meter it takes 100 seconds to cycle the 2 cu ft dial. What is my cfm?
A | 950cfm |
B | 1111 cfm |
C | 1500 cfm |
D | 1,125 cfm
|
Question 28 |
While testing the heat rise with electric heat, the following was recorded. Volts 228, Amps 27.6, temperature difference 26 degrees. What is the cfm?
A | 950 cfm |
B | 767 cfm |
C | 1111 cfm |
D | 1,125 cfm
|
Question 29 |
Calculate air volume based on these conditions: 90,000 BTUH output, return temperature 70 degrees, supply temperature 110.
A | 1158 cfm |
B | 1500 cfm |
C | 1800 cfm |
D | 2083 cfm |
Question 30 |
If a single phase electric heat section is supplied with 227 volts, 45 amps the BTUH output is?
A | 34,500 BTUH |
B | 25,000 BTUH |
C | 36,000 BTUH |
D | 42,000 BTUH |
Question 31 |
The pressure gauge used to sense external static pressure in a residential duct system should have a scale of
A | 0 - 1” WC |
B | 0 -2” WC |
C | 0 – 10” WC |
D | 0 – 40” WC |
Question 32 |
Taking average readings of air velocity in the cross sectional area of a duct is called
A | Surveying |
B | Traversing |
C | Averaging |
D | Estimating |
Question 33 |
If the velocity of air in a 20 X 10 duct is 750 fpm, what is the amount air being delivered by this duct?
A | 1209 cfm |
B | 904 cfm |
C | 1042 cfm |
D | 825 cfm
|
Question 34 |
If the velocity of air in a 20 X 10 duct is 650 fpm, what is the air being delivered by this duct?
A | 1209 cfm |
B | 904 cfm |
C | 1042 cfm |
D | 825 cfm |
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