Question 1

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)   condenserE) A) and B)
F) None of the above

Question 2

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 3

The pressure in a duct system is measured in ____.

Accepted Answer

A)   psig
B)   psia
C)   in. Hg
D)   in. WCE) A) and D)
F) All of the above D

Question 4

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

Accepted Answer

A) True 
 B)False

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 psiE) A) and B)
F) A) and C)

Question 6

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 lowE) None of the above
F) All of the above C

Question 7

Describe a pitot tube.

Accepted Answer

The pitot tube is constructed as two con...

Question 8

The duct pressure equals the velocity pressure plus static pressure.

Accepted Answer

A) True 
 B)False

Question 9

Explain the purpose of the supply duct.

Accepted Answer

The supply duct system distrib...

Question 10

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 11

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)   speedometerE) None of the above
F) B) and C)

Question 12

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 feetE) All of the above
F) B) and C)

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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 15

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

Accepted Answer

A) True 
 B)False  False

Question 16

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)   20E) A) and C)
F) All of the above

Question 17

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 18

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 19

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 20

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

Accepted Answer

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

Exam 37: Air Distribution and Balance

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

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

Correct AnswerverifiedShow Answer

The pressure in a duct system is measured in ____.

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Describe a pitot tube.

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

The duct pressure equals the velocity pressure plus static pressure.

Correct AnswerverifiedShow Answer

Explain the purpose of the supply duct.

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

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

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

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

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

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

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

Correct AnswerverifiedShow 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

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

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

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The pitot tube is constructed as two con...
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The supply duct system distrib...
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The components that make up the forced-a...
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