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Nate Practice Questions Al Moran 07-30-2006
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Posted by Al Moran on July 30, 2006, 10:27 am
Studying for the Nate exam from a book from Dewalt called HVAC
Technician Certification Guide. Some of the answers don't make sense.
i.e....

The term "induced draft" most likely refers to:

a. A compressor

b. A type of control

c. A type of cooling tower

d. A type of test instrument.

The book says the correct answer is c. What is a cooling tower and how
is it related to induced draft?

The pipe which connects the evaporator to the compressor is the:

a. Suction line

b. The liquid line

c. The discharge line

d. The hot gas line

Not to point out the obvious but the correct answer is a. The very
next question says:

The pipe which connects the compressor to the condenser is:

a. Suction line

b. The liquid line

c. The discharge line

d. The hot gas line

The book says the correct answer is c. Why is it not also b?

A 125 pound cylinder of R22 is stored in a room at 80 degrees
fahrenheit. The pressure in the cylinder should be:

a. 144 psig

b. 160 psig

c. 175 psig

d. 80 psig

The book says the correct answer is a. How is this answer arrived at?
What is the math equation?

A frosted suction line on an air conditioning application indicates:

a. The system is overcharged

b. The system is undercharged

c. The suction line temperature is below the dew point of the ambient
air and at or below 32 degrees fahrenheit

d. There is air in the system.

The book says the correct answer is c. Why is it not b?



Posted by geojr on July 30, 2006, 10:52 am

> Studying for the Nate exam from a book from Dewalt called HVAC
> Technician Certification Guide. Some of the answers don't make sense.
> i.e....
>
> The term "induced draft" most likely refers to:
>
> a. A compressor
>
> b. A type of control
>
> c. A type of cooling tower
>
> d. A type of test instrument.
>
> The book says the correct answer is c. What is a cooling tower and how
> is it related to induced draft?

Your book is fucked on that one !

> The pipe which connects the evaporator to the compressor is the:
>
> a. Suction line
>
> b. The liquid line
>
> c. The discharge line
>
> d. The hot gas line
>
> Not to point out the obvious but the correct answer is a. The very
> next question says:
>
> The pipe which connects the compressor to the condenser is:
>
> a. Suction line
>
> b. The liquid line
>
> c. The discharge line
>
> d. The hot gas line
>
> The book says the correct answer is c. Why is it not also b?

Hint al- the liquid line is past the condenser :-))

> A 125 pound cylinder of R22 is stored in a room at 80 degrees
> fahrenheit. The pressure in the cylinder should be:
>
> a. 144 psig
>
> b. 160 psig
>
> c. 175 psig
>
> d. 80 psig
>
> The book says the correct answer is a. How is this answer arrived at?
>What is the math equation?

pt chart maybe?

> A frosted suction line on an air conditioning application indicates:
>
> a. The system is overcharged
>
> b. The system is undercharged
>
> c. The suction line temperature is below the dew point of the ambient
> air and at or below 32 degrees fahrenheit
>
> d. There is air in the system.
>
> The book says the correct answer is c. Why is it not b?
>
think high superheat... umm ba ba comba ( assuming correct airflow ) of
course :-)



Posted by Stormin Mormon on July 30, 2006, 10:15 pm
> The term "induced draft" most likely refers to:
>
> a. A compressor
>
> b. A type of control
>
> c. W Bush's war in Iraq is running short of men.
>
> d. A type of test instrument.
>
> The book says the correct answer is c.


> The pipe which connects the evaporator to the compressor is the:
>
> a. Big frosty tube with foam wrap
>
> b. The liquid line
>
> c. The discharge line
>
> d. The hot gas line
>
> Not to point out the obvious but the correct answer is a. The very
> next question says:
>
> The pipe which connects the compressor to the condenser is:
>
> a. Suction line
>
> b. The liquid line
>
> c. Hot as heck and shouldn't be messed with
>
> d. Full of mollecules
>
> The book says the correct answer is c. Why is it not also b?



> A 125 pound cylinder of R22 is stored in a room at 80 degrees
> fahrenheit. The pressure in the cylinder should be:
>
> a. Easily high enough to blow dust out of condensors
>
> b. 160 psig
>
> c. 175 psig
>
> d. 80 psig
>
> The book says the correct answer is a.


> A frosted suction line on an air conditioning application indicates:
>
> a. Time to give it some more of that freezon stuff
>
> b. Needs to hook up that green bottle and juice er up
>
> c. The customer needs to call a repair guy
>
> d. Nuttin. Just defrost it and start over.
>
> The book says the correct answer is c. Why is it not b?
>
The AC is on, but the house is warm. The likely solution is:

a. Open a window
b. Add more of that freezon stuff
c. Replace thermostat
d. Call the AC guy that Ma and Pa use, he was plenty cheap last time
he put some more of that freezon stuff in Ma's AC. Pa sure liked that.







Posted by She-Hate-Me on July 30, 2006, 10:56 am

> Studying for the Nate exam from a book from Dewalt called HVAC
> Technician Certification Guide. Some of the answers don't make sense.
> i.e....

> A 125 pound cylinder of R22 is stored in a room at 80 degrees
> fahrenheit. The pressure in the cylinder should be:
>
> a. 144 psig
>
> b. 160 psig
>
> c. 175 psig
>
> d. 80 psig
>
> The book says the correct answer is a. How is this answer arrived at?
> What is the math equation?

Just look up 80 degrres on any wallet chart and answer "A" is there.



> A frosted suction line on an air conditioning application indicates:
>
> a. The system is overcharged
>
> b. The system is undercharged
>
> c. The suction line temperature is below the dew point of the ambient
> air and at or below 32 degrees fahrenheit
>
> d. There is air in the system.
>
> The book says the correct answer is c. Why is it not b?

If it is grossly undercharged it wouldn't freeze.





Posted by Jake on July 30, 2006, 1:04 pm
Al Moran wrote:
> Studying for the Nate exam from a book from Dewalt called HVAC
> Technician Certification Guide. Some of the answers don't make sense.
> i.e....
>
> The term "induced draft" most likely refers to:
>
> a. A compressor
>
> b. A type of control
>
> c. A type of cooling tower
>
> d. A type of test instrument.
>
> The book says the correct answer is c. What is a cooling tower and how
> is it related to induced draft?

See this link from BAC... one of the leading manufacturers of cooling
towers...
http://www.baltimoreaircoil.com/english/info_center/eBook/SectionFiles/OCT_Overiew.pdf

'Induced draft' generally means the fan is pulling air through cooling,
or 'wet section' of the tower. 'Forced draft' generally means the fan is
pushing air through the wet section.

Centrifugal fans are more commonly used in forced draft applications,
while axials (with the fan mounted at the very top of the tower) are
mostly used in induced applications.

Vicki could tell you more about cooling towers than you'd ever need to
know....

Jake

>
> The pipe which connects the evaporator to the compressor is the:
>
> a. Suction line
>
> b. The liquid line
>
> c. The discharge line
>
> d. The hot gas line
>
> Not to point out the obvious but the correct answer is a. The very
> next question says:
>
> The pipe which connects the compressor to the condenser is:
>
> a. Suction line
>
> b. The liquid line
>
> c. The discharge line
>
> d. The hot gas line
>
> The book says the correct answer is c. Why is it not also b?

To my knowledge, the compressor is not discharging liquid... if it did,
we wouldn't need a condenser, would we?

>
> A 125 pound cylinder of R22 is stored in a room at 80 degrees
> fahrenheit. The pressure in the cylinder should be:
>
> a. 144 psig
>
> b. 160 psig
>
> c. 175 psig
>
> d. 80 psig
>
> The book says the correct answer is a. How is this answer arrived at?
> What is the math equation?
>
> A frosted suction line on an air conditioning application indicates:
>
> a. The system is overcharged
>
> b. The system is undercharged
>
> c. The suction line temperature is below the dew point of the ambient
> air and at or below 32 degrees fahrenheit
>
> d. There is air in the system.
>
> The book says the correct answer is c. Why is it not b?
>
>

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