CM 411: Specialty Contracting HVAC & Plumbing Midterm Actual Exam Questions With Real Answers
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Course
CM 411: Specialty Contracting HVAC & Plumbing
Institution
CM 411: Specialty Contracting HVAC & Plumbing
Which is not an element for comfort?
Temp, Noise, Humidity, or Circulation? - CORRECT ANSWER-Noise
Normal ventilation for a building is: - CORRECT ANSWER-20 CFM per person
Comfort for heating and cooling is usually attained with a relative humidity of what percentage? - CORRECT ANSWER-50%
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CM 411: Specialty Contracting HVAC &
Plumbing Midterm Actual Exam
Questions With Real Answers
Which is not an element for comfort?
Temp, Noise, Humidity, or Circulation? - CORRECT ANSWER-Noise
Normal ventilation for a building is: - CORRECT ANSWER-20 CFM per person
Comfort for heating and cooling is usually attained with a relative humidity of what
percentage? - CORRECT ANSWER-50%
Water flow is typically expressed in which units? - CORRECT ANSWER-Gallons per
minute
A device that removes moisture from air by causing moisture to condense is called a: -
CORRECT ANSWER-DEhumidifier
Liquids traveling through a steel pipe have pressure loss due to which two factors? -
CORRECT ANSWER-friction with the interior walls of the pipe, and changes in direction
at elbows and T junctions
Air filters are placed prior to air movement equipment in order to: - CORRECT
ANSWER-Keep material and debris from entering air movement equipment
What indicates when moisture will start to condense? - CORRECT ANSWER-Dew point
Sensible heat is measured using: - CORRECT ANSWER-Dry bulb temperature
,If the inlet to the pump does not have enough head, what will happen? - CORRECT
ANSWER-The pump will begin to cavitate
True or False: Heating and cooling loads occur because of a difference between the
indoor and outdoor temperature, infiltration in the building, and internal loads -
CORRECT ANSWER-True
True or False: The winter dry bulb temperature is the coldest temperature expected in
January for any given location - CORRECT ANSWER-False
True or False: Exposed surfaces are building surfaces that are exposed to outdoor
temperatures - CORRECT ANSWER-True
True or False: Net wall area is the area of wall after the area of windows, doors, and
other openings have been subtracted from gross wall area - CORRECT ANSWER-True
True or False: When calculating the area of a ceiling, all overhangs are included -
CORRECT ANSWER-False
Estimating the number of people occupying a residential building and estimating the
number of people occupying a commercial building are done with the same method -
CORRECT ANSWER-False
True or False: Any device that produces heat inside a building must be compensated for
by a cooling load - CORRECT ANSWER-True
True or False: A conduction factor (U) is a number that represents the amount of heat
that flows through a building because of a temperature difference - CORRECT
ANSWER-True
True or False: Infiltration occurs when air flows through a furnace filter - CORRECT
ANSWER-False
, True or False: The volumetric flow rate of ventilation air required for a building is based
on volumetric flow rate of air required per person in the building - CORRECT ANSWER-
True
True or False: The amount of heat given off from building occupants varies depending
on the activity of the occupants - CORRECT ANSWER-True
True or False: Equivalent temperature difference is the design temperature difference,
which is adjusted for heat gain from appliances - CORRECT ANSWER-False
When the sun shines on an exterior surface of a building or opaque objects inside a
building, the solar energy becomes chemical energy - CORRECT ANSWER-False
Variables and __________ are entered on a load form and are used to calculate heat
losses and gains for a building - CORRECT ANSWER-Factors
A summer indoor design temperature of _____ degrees F is usually selected to provide
comfort for a normally clothed person during the summer - CORRECT ANSWER-75
Summer outdoor design temperatures are the warmest temperatures expected in an
area during ____% of the summer - CORRECT ANSWER-95
________s are written supplements to plans that describe the materials used for a
building - CORRECT ANSWER-Specifications
For cooling load calculations, the area of windows and glass doors is calculated and
entered on the form according to _____. - CORRECT ANSWER-exposure
The _____ of the ceiling and floor is found by multiplying the dimensions of the rooms -
CORRECT ANSWER-area
______ is the opening around windows, door, and other openings in a building such as
between the foundation and framework of the building - CORRECT ANSWER-Crackage
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