Chapter 2 HVAC Fundamentals
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
1) Name the three energy forms (not fuels) used in building environmental systems:
A. ________
B. ________
C. ________
1)
_____________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
2) How many Btu are required to heat 2 lbs. of water by 4°F? 2) _______
A) 4 B) 8 C) 2 D) 6
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
3) Btu is a (quantity of heat ________ / rate of heat flow ________). Btuh is a (quantity of
heat ________ / rate of heat flow ________).
3)
_____________
4) kW is a (quantity of electricity ________ / rate of electric power ________). KWH is a
(quantity of electricity ________ / rate of electric power ________).
4)
_____________
5) Match these heating fuels with their likely utilization efficiency.
300% 100% 80%
A. Natural gas ________% efficient
B. Electric ________% efficient
C. Electric heat pump ________% efficient
5)
_____________
6) List these heating fuels in order of their cost per mmBtu. Highest cost no. 1; next highest,
no. 2; etc.
A. ________ Natural gas
B. ________ Electric heat pump
C. ________ Propane
D. ________ Electric resistance
6)
_____________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
7) Pick the two terms which are synonymous. 7) _______
A) Humidity ratio B) Relative humidity C) Absolute humidity
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
8) Wet-bulb temperature is generally (higher ________ / lower ________) than dry-bulb
temperature.
8)
_____________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
9) If wet-bulb temperature is equal to dry-bulb temperature, the air is ________. Select all that
apply.
9) _______
A) Isenthalpic. B) Adiabatically conditioned.
C) 100% relative humidity. D) Saturated.
10) A horizontal move to the right on the psychrometric chart corresponds to which of the
following?
Select all that apply.
10)
______
A) A decrease in specific volume. B) An increase in enthalpy.
C) A decrease in density. D) A decrease in humidity ratio.
E) A decrease in relative humidity. F) A decrease in dewpoint.
11) A horizontal move to the left on the psychrometric chart corresponds to which of the following?
Select all that apply.
11)
______
A) A decrease in specific volume. B) An increase in enthalpy.
C) A decrease in density. D) A decrease in humidity ratio.
E) A decrease in relative humidity. F) A decrease in dewpoint.
12) A vertical move upward on the psychrometric chart corresponds to which of the following?
Select all that apply.
12)
______
A) A decrease in specific volume. B) An increase in enthalpy.
C) A decrease in density. D) A decrease in humidity ratio.
E) A decrease in relative humidity. F) A decrease in dewpoint.
13) A vertical move downward on the psychrometric chart corresponds to which of the following?
Select all that apply.
13)
______
A) A decrease in specific volume. B) An increase in enthalpy.
C) A decrease in density. D) A decrease in humidity ratio.
E) A decrease in relative humidity. F) A decrease in dewpoint.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
14) Fill in the right units of measure for these quantities:
A. Air pressure in a duct ________
B. Water pressure in a pipe ________
C. Air velocity in a duct ________
D. Water velocity in a pipe ________
14)
_____________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
15) Which of the following equations is correct to calculate sensible heat flow by air? 15)
______
A) Q = 500 * GPM * ∆T B) Q = 4.5 * CFM * ∆H
C) Q = 1.1 * CFM * ∆T D) Q = 4840 * CFM * ∆W
16) Which of the following equations is correct to calculate heat flow by water? 16)
______
A) Q = 500 * GPM * ∆T B) Q = 4.5 * CFM * ∆H
C) Q = 1.1 * CFM * ∆T D) Q = 4840 * CFM * ∆W
17) Which of the following equations is correct to calculate latent heat flow by air? 17)
______
A) Q = 500 * GPM * ∆T B) Q = 4.5 * CFM * ∆H
C) Q = 1.1 * CFM * ∆T D) Q = 4840 * CFM * ∆W
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
18) Name the four parameters that affect comfort:
A. ________
B. ________
C. ________
D. ________
18)
_____________
