HVAC Study Guide Exam Questions
and Answers19
What is the main difference between the two-position and timed two-position control?
a) The timed two-position maximizes the difference between the operation and control
differential
b) The timed two-position control makes use of a proportional plus integral control
c) The timed two-position minimizes the difference between the operating and control
differential
d) The timed two-position control does not use an on-off control
e) The timed two-position control has no control differential - ANSWERS -c) The timed two-
position minimizes the difference between the operating and control differential
Proportional integral controllers are used in what type of control action?
a) integrating
b) two-position
c) timed two-position
d) modulating
e) floating - ANSWERS -d) modulating
What is the most advanced controller?
a) Proportional integral controller
b) Two-position controller
c) Floating action controller
d) Timed two-position controller
,e) Proportional integral derivative controller - ANSWERS -e) Proportional integral derivative
controller
Why is IAQ important?
a) to provide a comfortable environment for occupants
b) to provide enough oxygen for occupants
c) to provide the right temperature for a productive environment for occupants
d) to provide sufficient airflow for occupants
e) to provide a healthy environment for occupants - ANSWERS -e) to provide a healthy
environment for occupants
What is not considered a contaminate?
a) Carbon Dioxide
b) Ozone
c) Carbon Monoxide
d) Oxygen
e) Radon - ANSWERS -d) Oxygen
What gas is the best indicator for the quality of air in a building?
a) Oxygen
b) Carbon Dioxide
c) Ozone
d) Carbon Monoxide
e) Radon - ANSWERS -b) Carbon Dioxide
What is not true statement about carcinogens?
a) carcinogen exposure can cause irreversible health problems
, b) exposure to carcinogens might be unnoticeable
c) the only source of carcinogens comes from environmental tobacco smoke (ETS)
d) carcinogens are among the most significant contaminants
e) the risk of cancer increases with level and time of exposure to carcinogens - ANSWERS -c) the
only source of carcinogens comes from environmental tobacco smoke (ETS)
How can concentration of contaminants be calculated?
a) by adding the source strength to the ventilation rate
b) by dividing the source strength by the ventilation rate
c) by subtracting the ventilation rate from the source strength
d) by multiplying the source strength by 1000 ppm
e) by dividing the source strength by the production rate - ANSWERS -b) by dividing the source
strength by the ventilation rate
What is the recommended outdoor air ventilation rate per person for an office space according
to ASHRAE Standard 62-1989?
a) 20 cfm
b) 45 cfm
c) 100 cfm
d) 300 cfm
e) 1000 cfm - ANSWERS -a) 20 cfm
What is not a primary way to affect air quality control?
a) ventilation
b) source control
c) humidity control
d) air cleaning
and Answers19
What is the main difference between the two-position and timed two-position control?
a) The timed two-position maximizes the difference between the operation and control
differential
b) The timed two-position control makes use of a proportional plus integral control
c) The timed two-position minimizes the difference between the operating and control
differential
d) The timed two-position control does not use an on-off control
e) The timed two-position control has no control differential - ANSWERS -c) The timed two-
position minimizes the difference between the operating and control differential
Proportional integral controllers are used in what type of control action?
a) integrating
b) two-position
c) timed two-position
d) modulating
e) floating - ANSWERS -d) modulating
What is the most advanced controller?
a) Proportional integral controller
b) Two-position controller
c) Floating action controller
d) Timed two-position controller
,e) Proportional integral derivative controller - ANSWERS -e) Proportional integral derivative
controller
Why is IAQ important?
a) to provide a comfortable environment for occupants
b) to provide enough oxygen for occupants
c) to provide the right temperature for a productive environment for occupants
d) to provide sufficient airflow for occupants
e) to provide a healthy environment for occupants - ANSWERS -e) to provide a healthy
environment for occupants
What is not considered a contaminate?
a) Carbon Dioxide
b) Ozone
c) Carbon Monoxide
d) Oxygen
e) Radon - ANSWERS -d) Oxygen
What gas is the best indicator for the quality of air in a building?
a) Oxygen
b) Carbon Dioxide
c) Ozone
d) Carbon Monoxide
e) Radon - ANSWERS -b) Carbon Dioxide
What is not true statement about carcinogens?
a) carcinogen exposure can cause irreversible health problems
, b) exposure to carcinogens might be unnoticeable
c) the only source of carcinogens comes from environmental tobacco smoke (ETS)
d) carcinogens are among the most significant contaminants
e) the risk of cancer increases with level and time of exposure to carcinogens - ANSWERS -c) the
only source of carcinogens comes from environmental tobacco smoke (ETS)
How can concentration of contaminants be calculated?
a) by adding the source strength to the ventilation rate
b) by dividing the source strength by the ventilation rate
c) by subtracting the ventilation rate from the source strength
d) by multiplying the source strength by 1000 ppm
e) by dividing the source strength by the production rate - ANSWERS -b) by dividing the source
strength by the ventilation rate
What is the recommended outdoor air ventilation rate per person for an office space according
to ASHRAE Standard 62-1989?
a) 20 cfm
b) 45 cfm
c) 100 cfm
d) 300 cfm
e) 1000 cfm - ANSWERS -a) 20 cfm
What is not a primary way to affect air quality control?
a) ventilation
b) source control
c) humidity control
d) air cleaning
