MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON NEWEST ACTUAL EXAM COMPLETE
150 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY
GRADED A+
What is the driving force for water vapor movement? - ANSWER Difference in
vapor pressure
What is the elevation up to which very little error is introduced in the information
gathered using a psyhometric chart? - ANSWER 2000 ft
Which of the following can be used effectively for gathering data to produce sensible
and ltent heat changes in an air/water vapor mixture, in order to predict heating r
cooling capacity? - ANSWER Psychometric chart
What is meant by specific volume of air? - ANSWER Number of cubic feet occupied
by a pound of air (ft^3/lb)
When does condensation occur on a building component's surface? - ANSWER
When the surface temperature is lower than the dew ppoint temperature of the
ambient air/water vapor mixture
A large part of winter heating energy for a building is used to remove moisture from
air - ANSWER False
What is meant by grain difference? - ANSWER Water vapor difference between
outdoor and indoor air in grains per pound of dry air
What is the quantity of water that will consume or release 1 BTU of heat when
heated up or cooled down by 1 degree F? - ANSWER 1 pound of air
The values of at least ___ unrelated characteristics of an air-water vapor mixture ave
to be known in order to find the values of other characteristics, using a psychometric
chart - ANSWER 2
The factors that contribute to both sensible and latent heat gains are ___ and outside
air - ANSWER people
The rate of air change per hour (ACH) in a building is .75 What does it mean? -
ANSWER 75% of air in the building is replaced every hour
Which one of the following could be a factor for infiltration of outside air into buildings
- ANSWER temperature difference between inside and outside air
, How would you calculate the U value of a construction made of composite materials?
- ANSWER By adding the R values of all materials in a construction and finding the
reciprocal of the sum
What is one of the functions of an enthalpy-controlled economizer? - ANSWER It
evaluates both outdoor dry-bulb temp and humidity
What index is used to measure the tendency of a material to oppose heat flow? -
ANSWER R-value
what is one of the important means of maintaining indoor air quality of a building? -
ANSWER By maintaining a continuous supply of fresh outdoor air
Internal loads play a significant role in heat gain by buildings, which of the following
is not considered as an internal load? - ANSWER indoor air
What are the factors that contribute to latent heat gain? - ANSWER People and
outdoor air
What index is used to measure the tendency of a material to conduct heat flow? -
ANSWER U-value
One grain is equal to? - ANSWER 1/7000 lb
what is convection? - ANSWER Circulation of gases or liquids due to temperature
difference
Magnitude of radiant heat transfer between 2 objects is dependent on the
temperature difference between sour and receiver. T/F - ANSWER True
Warm air cannot hold as much as cold air T/F - ANSWER False
Which of the following air/water vapor mixture cannot be read from a pyschrometric
char? - ANSWER Equivalent temperature
Which of the following is an indicator of the total heat in an air/water vapor mixture? -
ANSWER Wet bulb temperature
Which of the following actions may help to increase convective heat loss? -
ANSWER increase in air motion
Which of the following statements is not true for a high velocity duct system? -
ANSWER Duct sizes are very large in this system
What are the different air distribution patterns for wall registers? - ANSWER
Straight, medium, and maximum
Air stream coming out from a register slows down to a comfortable velocity at the
end of the throw. What is the range of velocity of that air stream (in FPM) - ANSWER
50-100 FPM
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