Question 1

Oversized duct systems cost more to fabricate and install and will also result in the slowing of the air as it flows through the duct.

Accepted Answer

A) True 
 B)False

Question 2

Friction due to air rubbing the walls of the ductwork can be eliminated.

Accepted Answer

A) True 
 B)False  False

Question 3

One reason for using an extended plenum system is to ____.

Accepted Answer

A)   save materials
B)   reduce the velocity of the air as the air reaches the last takeoffs on the extended plenum
C)   prolong the main plenum closer to the farthest supply register
D)   keep the noise level low C

Question 4

A(n)  ____ can be connected to measure the velocity pressure of the air moving in a duct.

Accepted Answer

A)   ammeter
B)   manometer
C)   pyrometer
D)   speedometer

Question 5

The atmosphere exerts a pressure of ____ at standard atmospheric conditions.

Accepted Answer

A)   12.696 psi
B)   14.696 psi
C)   16.696 psi
D)   18.696 psi

Question 6

If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss?

Accepted Answer

A)   10 feet
B)   20 feet
C)   30 feet
D)   60 feet

Question 7

Galvanized sheet metal comes in several different thicknesses, called the ____________________ of the metal.

Accepted Answer

The answer of Galvanized sheet metal comes in several different...

Question 8

Duct systems can be plenum, extended plenum, reducing plenum, or perimeter loop.

Accepted Answer

A) True 
 B)False

Question 9

The ____ provides the pressure difference needed to force the air into the duct system, through the heat-transfer surfaces in the conditioning equipment, through the grilles and registers, and into the room.

Accepted Answer

A)   blower
B)   forcer
C)   compressor
D)   condenser

Question 10

A(n)  ____ºF temperature difference from the inside to the outside of the duct is considered the maximum difference allowable before insulation is necessary.

Accepted Answer

A)   10
B)   15
C)   18
D)   20

Question 11

If the velocity of air through an 8" x 20" duct is 700 fpm, how many cfm of air is being carried by the duct?

Accepted Answer

(8" x 20" ...

Question 12

The forced-air system is different from a natural-draft system, where the air passes naturally over the conditioning equipment.

Accepted Answer

A) True 
 B)False

Question 13

Describe a pitot tube.

Accepted Answer

The pitot tube is constructed as two con...

Question 14

The pressure in a duct system is measured in ____.

Accepted Answer

A)   psig
B)   psia
C)   in. Hg
D)   in. WC D

Question 15

Flexible round duct comes in sizes up to about ____________________ in. in diameter.

Accepted Answer

The answer of Flexible round duct comes in sizes up...

Question 16

Explain the purpose of the supply duct.

Accepted Answer

The supply duct system distrib...

Question 17

What are the components that make up the forced-air system?

Accepted Answer

The components that make up the forced-a...

Question 18

Adjusting the tension on the belt will alter the rate at which air is moving through the system but does not affect the amperage draw of the motor.

Accepted Answer

A) True 
 B)False

Question 19

The duct pressure equals the velocity pressure plus static pressure.

Accepted Answer

A) True 
 B)False

Question 20

Canvas collars are generally made of canvas rather than other materials such as rubber.

Accepted Answer

A) True 
 B)False

Exam 37: Air Distribution and Balance

Oversized duct systems cost more to fabricate and install and will also result in the slowing of the air as it flows through the duct.

Correct AnswerverifiedShow Answer

Friction due to air rubbing the walls of the ductwork can be eliminated.

Correct AnswerverifiedFalse

One reason for using an extended plenum system is to ____.

Correct AnswerverifiedC

A(n) ____ can be connected to measure the velocity pressure of the air moving in a duct.

Correct AnswerverifiedShow Answer

The atmosphere exerts a pressure of ____ at standard atmospheric conditions.

Correct AnswerverifiedShow Answer

If the equivalent length of a transition piece of ductwork is 10 feet and the main duct in series with it is 20 feet, what is the length used to estimate the total frictional loss?

Correct AnswerverifiedShow Answer

Galvanized sheet metal comes in several different thicknesses, called the ____________________ of the metal.

Correct AnswerverifiedShow Answer

Duct systems can be plenum, extended plenum, reducing plenum, or perimeter loop.

Correct AnswerverifiedShow Answer

The ____ provides the pressure difference needed to force the air into the duct system, through the heat-transfer surfaces in the conditioning equipment, through the grilles and registers, and into the room.

Correct AnswerverifiedShow Answer

A(n) ____ºF temperature difference from the inside to the outside of the duct is considered the maximum difference allowable before insulation is necessary.

Correct AnswerverifiedShow Answer

If the velocity of air through an 8" x 20" duct is 700 fpm, how many cfm of air is being carried by the duct?

Correct Answerverified(8" x 20" ...View AnswerShow Answer

The forced-air system is different from a natural-draft system, where the air passes naturally over the conditioning equipment.

Correct AnswerverifiedShow Answer

Describe a pitot tube.

Correct AnswerverifiedThe pitot tube is constructed as two con...View AnswerShow Answer

The pressure in a duct system is measured in ____.

Correct AnswerverifiedD

Flexible round duct comes in sizes up to about ____________________ in. in diameter.

Correct AnswerverifiedShow Answer

Explain the purpose of the supply duct.

Correct AnswerverifiedThe supply duct system distrib...View AnswerShow Answer

What are the components that make up the forced-air system?

Correct AnswerverifiedThe components that make up the forced-a...View AnswerShow Answer

Adjusting the tension on the belt will alter the rate at which air is moving through the system but does not affect the amperage draw of the motor.

Correct AnswerverifiedShow Answer

The duct pressure equals the velocity pressure plus static pressure.

Correct AnswerverifiedShow Answer

Canvas collars are generally made of canvas rather than other materials such as rubber.

Correct AnswerverifiedShow Answer

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False

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C

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(8" x 20" ...
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The pitot tube is constructed as two con...
View Answer

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D

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The supply duct system distrib...
View Answer

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The components that make up the forced-a...
View Answer

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