HVAC System Design

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Congratulations - you have completed HVAC System Design.

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Question 1

All of the following values are needed to select a heat pump except _____ load.

A	sensible cooling
B	sensible heating
C	latent cooling
D	latent heating

Question 2

All of the following are generally factors in calculating commercial heating and cooling loads except _____.

A	extensive use of steel and/or glass facades
B	estimating instructions in ACCA Manual J
C	large, open areas
D	significant variations in people load

Question 3

Of the following load factors, _____ has more effect on the cooling load.

A	shaded glass
B	duct gain/loss
C	infiltration
D	wood and metal doors

Question 4

The trap in the condensate drain _____.

A	prevents water from being held in the drain pan by the blower
B	keeps condensate from freezing
C	stores condensate in case the drain line is plugged
D	prevents oil from returning to the evaporator

Question 5

The transfer of heat energy from particle to particle in a substance is known as _____.

A	radiation
B	convection
C	conduction
D	conductance

Question 6

Which of the following is an incorrect statement with regard to refrigerant piping?

A	When the indoor coil and outdoor unit are at the same level, the suction line should be pitched toward the indoor coil.
B	When the indoor coil is below the outdoor unit, there should be an oil trap in the suction line near the indoor unit.
C	The suction line should always be insulated.
D	The liquid line should be insulated in areas where it is exposed to direct sunlight.

Question 7

Which form of heat transfer can travel through a vacuum?

A	Radiation
B	Convection
C	Conduction
D	Conductance

Question 8

The hot gas line conveys _____.

A	hot, high-pressure liquid refrigerant
B	low-pressure liquid refrigerant
C	low-temperature, low-pressure vapor
D	hot, high-pressure vapor

Question 9

Of the following load factors, _____ has more effect on heating load than it does on cooling load.

A	people load
B	infiltration
C	window glass
D	roof color

Question 10

The insulated duct that has the lowest pressure loss is _____.

A	metal duct with inside insulation
B	metal duct with outside insulation
C	fiberglass duct
D	flexible duct

Question 11

In order to determine the heat gain of a southern exposure 6' by 20' double-pane window with a heat transfer multiplier of 38, you should _____.

A	look up the heat gain in a table
B	determine the R-value, then use a table to find the heat gain
C	divide the area of the window by the HTM
D	multiply the area of the window by the HTM

Question 12

The total equivalent length of a supply and/or return duct run is the sum of the _____.

A	measured vertical straight lengths of duct in the path plus the equivalent lengths of all fittings in the path
B	measured horizontal and vertical straight lengths of duct in the path plus the equivalent lengths of all fittings in the path
C	measured horizontal straight lengths of duct in the path plus the equivalent lengths of all fittings in the path
D	equivalent lengths of all fittings and transitions in the path plus the grille losses

Question 13

Sliding glass doors are treated as _____.

A	windows
B	partially shaded window
C	walls
D	doors

Question 14

A room requiring an airflow of 270 cfm is supplied by three outlets. The air delivered by each outlet should be about _____ cfm.

A	300
B	810
C	90
D	270

Question 15

When calculating the heating load of basement walls, how are the portions above and below grade treated?

A	If most of the wall is below grade, the entire wall is treated as below grade, and vice versa.
B	If the wall is insulated, it has no heating load.
C	The load of the portion above grade is calculated separately from that of the portion below grade.
D	They are treated the same.

Question 16

Air systems with high sidewall or ceiling air outlets normally are designed to favor _____.

A	heating over cooling
B	cooling only
C	heating only
D	cooling over heating

Question 17

The air conditioning function that is most affected by duct losses is _____.

A	cooling
B	heating and cooling are equally affected
C	heating
D	humidification

Question 18

The external static pressure of the air distribution system includes all of the following except _____.

A	component losses not included in the fan rating
B	fan assembly losses
C	return duct system losses
D	supply duct system losses

Question 19

Latent heat is created by all of the following except _____.

A	people
B	appliances
C	direct sunlight
D	infiltration

Question 20

Each fitting and transition used in a duct system has _____.

A	a gain coefficient value (C-value)
B	approximately the same friction loss
C	a friction loss equal to a predetermined length of the same size straight duct
D	less friction loss per foot as the same size straight duct

Question 21

In selecting a heating or cooling system, _____ percent undersizing is generally acceptable.

A	5
B	10
C	20
D	15

Question 22

Velocity pressure in a duct equals the _____.

A	static pressure minus total pressure
B	total pressure minus the velocity pressure
C	static pressure plus velocity pressure
D	total pressure minus the static pressure

Question 23

Oversizing cooling equipment can result in _____.

A	inadequate cooling on design days
B	poor humidity control
C	improved operating efficiency
D	excessive cooling on design days

Question 24

Within an air distribution system, the lowest pressure level is found at the _____.

A	output of the blower
B	input to the blower
C	conditioned space
D	input to the return duct

Question 25

The practice of using a cooling coil with higher capacity than the condensing coil (mix-matching) is used in areas with ________.

A	low humidity and high dry-bulb temperatures
B	high humidity
C	low humidity and low dry-bulb temperatures
D	low humidity

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