Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
______ R-value of a structural panel is the average R-value for the entire assembly.
The average accounts for the different layers of material in the structure sandwich,
air film resistance and the effect of parallel conduction paths associated with framing materials.
Overall R- values are expressed as (SqFT x DEG F) / (Btuh) a. | subtracted | c. | average | b. | added | d. | overall | | | | |
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2.
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The R
value of a material is the thermal resistance associated with a specific _____? a. | layer | c. | conductance | b. | density | d. | thickness | | | | |
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3.
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Air
film resistances are ______ to the other R values associated with a structural
panel? a. | added | c. | muliplied | b. | subtracted | d. | none of these | | | | |
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4.
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A
wall sandwich having a overall R value of 18.1 would have a transmission coefficient (U) valve of
what? a. | 0.055 | c. | 0.255 | b. | 0.155 | d. | 18.1 | | | | |
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5.
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What
is the recommended Trunk Duct Supply side velocity in FPM for Flex Duct?
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6.
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To
calculate duct pressure drop the following formula is used? a. | Friction Rate x
Duct Length / 100 | c. | 100 x Friction
Rate / 100 | b. | Duct Length x Friction Rate /
100 | d. | None of
these | | | | |
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7.
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The
airflow in CFM that must be delivered to a room is based on the ratio of the room load and the
equipment sizing load. The heating factor is determined by dividing the Blower CFM by
what? a. | AMPS | c. | Design Cooling
Load | b. | VOLTS | d. | Design Heating
Load | | | | |
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8.
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As
the resistance to air flow goes up what happens to the air flow in CFM? a. | Goes
up | c. | stays the
same | b. | Goes
down | d. | none of
these | | | | |
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9.
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The
following equation can be used to convert the pressure drop (PD) that is associated with a duct run
to a friction rate (FR). a. | PD x 1000 / TEL | c. | PD x 100 / TDL | b. | PD x 100 /
TEL | d. | None of
these | | | | |
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10.
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Using
the sensible heating equation the CFM for a heating load of 30,000BTUH with a TD of 19 Degrees would
be?
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