Air Distribution

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Question 1

The lowest pressure level within an air distribution system is found at the _____.

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

Question 2

The velocity pressure in an air duct equals the _____.

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

Question 3

At sea level, every inch of the Earth has an absolute pressure of _____.

A	14.7 psi
B	0 psig
C	27.68 in. w.c
D	1.47 psia

Question 4

Air systems used only for heating usually require _____ systems used for both heating and cooling.

A	more airflow than
B	less airflow than
C	the same airflow as
D	twice the airflow as

Question 5

Forced-air systems designed for cooling require about _____ of airflow per ton of cooling.

A	200 cfm
B	320 cfm ±50
C	400 cfm ±50
D	475 cfm ±50

Question 6

Air distribution duct systems considered to be high-pressure systems have pressures greater than _____.

A	0.25 in. w.c.
B	0.75 in. w.c.
C	2.5 in. w.c.
D	3.5 in. w.c.

Question 7

When a change in the volume of airflow in cfm is known, Fan Law 1 can be used to calculate the _____.

A	new value for rpm
B	new value for static pressure
C	new value for horsepower
D	old value for cfm

Question 8

The total pressure loss in an air duct distribution system and its components (excluding the air handler) is called the _____.

A	total ductwork pressure loss
B	external static pressure loss
C	ductwork velocity pressure loss
D	internal static pressure loss

Question 9

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

A	favor heating over cooling
B	favor cooling over heating
C	favor heating only
D	accommodate building/ room construction

Question 10

Fiberglass duct _____.

A	can be used instead of metal duct in many applications
B	has less friction losses than metal duct
C	is noisier than metal duct
D	requires less support than metal duct

Question 11

All of the following are true with regard to fittings and transitions used in air duct systems, except that _____.

A	they have a pressure loss greater than a predetermined length of the same size straight duct
B	they can be used to change the direction of airflow in the duct
C	they have the same pressure loss per foot as the same size straight duct
D	they can be used to change the velocity of airflow in an air duct system

Question 12

A device used to control and balance airflow in forced air systems is a _____.

A	diffuser
B	damper
C	grille
D	register

Question 13

In order to minimize the spread of smoke within a building, select smoke dampers with a leakage rating of _____.

A	Class 1
B	Class 2
C	Class 3
D	Class 4

Question 14

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

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

Question 15

An instrument that gives a direct reading of relative humidity is called a _____.

A	sling psychrometer
B	manometer
C	velometer
D	hygrometer

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Tek Assist - NATE Core and Specialties Tests

Air Distribution

Air Distribution

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