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Thread: apprentice requesting answers
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07-12-2005, 07:25 PM #1
apprentice requesting answers
I am a stationary engineman in Quebec, Canada.
Recently, I wrote for my refrigeration certification.
In Canada, it is known as a refrigeration "B" class.
I would certainly appreciate some answers to a few
questions.
Q1 which one of the following is on the HIGH side?
a) evaporator
b) oil separator
c) condenser
d) liquid receiver
a is on the low side (obviously), but b, c, and d are clearly all on the HIGH side. Therefore, they are equally correct answers. There is an incompatibility issue concerning the questions and answers. What is one's opinion?
Q2 Does air (non-condensables) in the system cause
high discharge temperatures? Another answer supplied in the multiple choice was that it would increase the refrigeration system output.
Q3 What is the purpose of a cooling tower?
a) cool the condensate water OR
b) improve compressor operation (I selected B, because
a cooling tower helps reduce the condensing temperature/pressure, therefore the compressor discharge pressure is reduced. This minimizes wear and tear on the compressor (parts).
Q4 Would you say NH3 damages the environment more than butane, isobutane, chloride, methane (A3 group refrigerants)?
Q5 The suction filter on an air (reciprocating) compressor
is used to:
a) ensure a good suction OR
b) filter out dust and any foreign particles that can potentially contaminate the oil.
(I believe B is correct, because through the filtration of dust and foreign particles, not only does it help prevent the contamination of the oil, but it prevents that "dirt" from destroying the instruments in the field. (pneumatic valves can be negatively affected by such "dirt"). Answer a is simply too general. However, answer B clearly illustrates the suction filter's important use.
Thank you! I appreciate any feedback!
Napoleon
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07-12-2005, 08:18 PM #2
Re: apprentice requesting answers
Q1 which one of the following is on the HIGH side?
a) evaporator
b) oil separator
c) condenser
d) liquid receiver
a is on the low side (obviously), but b, c, and d are clearly all on the HIGH side. Therefore, they are equally correct answers. There is an incompatibility issue concerning the questions and answers. What is one's opinion?
Q2 Does air (non-condensables) in the system cause
high discharge temperatures? Another answer supplied in the multiple choice was that it would increase the refrigeration system output.
Will cause HIGH discharge pressure
Q3 What is the purpose of a cooling tower?
a) cool the condensate water OR
b) improve compressor operation (I selected B, because
a cooling tower helps reduce the condensing temperature/pressure, therefore the compressor discharge pressure is reduced. This minimizes wear and tear on the compressor (parts).
Cool the condensate water
ie: the warm water from shell and tube condenser goes thru the cooling tower and releases its heat.
Q4 Would you say NH3 damages the environment more than butane, isobutane, chloride, methane (A3 group refrigerants)?
Dont know
Q5 The suction filter on an air (reciprocating) compressor
is used to:
a) ensure a good suction OR
b) filter out dust and any foreign particles that can potentially contaminate the oil.
(I believe B is correct, because through the filtration of dust and foreign particles, not only does it help prevent the contamination of the oil, but it prevents that "dirt" from destroying the instruments in the field. (pneumatic valves can be negatively affected by such "dirt"). Answer a is simply too general. However, answer B clearly illustrates the suction filter's important use.
I believe you are rightAny opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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07-12-2005, 08:26 PM #3
Re: apprentice requesting answers
Thank you Aiyub for the feedback! I appreciate it!
cheers
Napoleon
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07-12-2005, 08:55 PM #4
Re: apprentice requesting answers
Those are some very odd questions indeed. take q. n1. the condensor, liquid receiver and oil sep are all on the high side. was there an option to indicate more than 1 answer? q. n5. what is a "good suction" ? does this mean correct pressure (and flow) for optimum system operation? they seem vague. also may i ask what is a stationary engineman? i am not familiar with this term.
thanks
s.Last edited by slingblade; 07-12-2005 at 09:07 PM. Reason: missed a bit.
Takes a licking, keeps on ticking.
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07-12-2005, 09:27 PM #5
Re: apprentice requesting answers
Originally Posted by slingblade
a) evaporator b) oil sep c) condenser d) liquid receiver
b, c, d, are all equally correct. I also found the "good suction" bit quite unclear, as it does not properly relate to the question. That is why I selected the fact that a suction filter is used to filter out dust and any foreign particles from contaminating the oil. I doubt a suction filter would optimize the compressor's operation by controlling a "good suction" pressure. There are controls that ensure proper suction pressure setting. Do you think my answer (dust/particle filtration) is the better of the two?
Canadian technical language translates refrigeration engineer/technician to stationary engineman. Stationary implies that the engineer/technician works with stationary machines. Engineman is another synonimous term to engineer. Stationary (machines) Engineman (engineer); it also covers the occupation of boiler-man.
Hope this clarifies the canadian technical terminology.
thanks
napoleon
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07-12-2005, 10:21 PM #6
Re: apprentice requesting answers
(Q4) Would you say NH3 damages the environment more than butane, isobutane, chloride, methane (A3 group refrigerants)?
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07-12-2005, 10:25 PM #7
Re: apprentice requesting answers
Thank you US Iceman for the feedback!
Cheers
Napoleon
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07-12-2005, 11:18 PM #8
Re: apprentice requesting answers
I agree that both oil sep and receiver are on the high side
In the absence of being able to indicate all three on the answer sheet..............
I would gp for condenser first
Receiver 2nd and oil sep third
Im a bit unclear about oil sep as it has an in port on the high side, then an oil return point via the low pressure sump
Who knows what was in the mind of the guy who set the questions
But u cant go wrong putting down condenser coilAny opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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07-12-2005, 11:24 PM #9
Re: apprentice requesting answers
Thank you Aiyub for the feedback!
cheers
napoleon
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08-12-2005, 12:02 AM #10
Re: apprentice requesting answers
Stationary implies that the engineer/technician works with stationary machines.
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08-12-2005, 03:38 AM #11
Re: apprentice requesting answers
Hello Dan! You make a good point! Stationary also, definitely, indicates the fact that the engineman is to stay and monitor the refrigeration system. Oddly, here in Quebec, the francophones mistakenly believe that the term stationary relates to machines and humans. Quebecors label service technicians as stationary enginemen. The translation or terminology is misleading
given the nature of the work. This may be attributed to the language issue in Quebec.
thanks
Napoleon
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08-12-2005, 08:16 PM #12
Re: apprentice requesting answers
I agree that both oil sep and receiver are on the high side
In the absence of being able to indicate all three on the answer sheet..............
I would gp for condenser first
Receiver 2nd and oil sep third
Im a bit unclear about oil sep as it has an in port on the high side, then an oil return point via the low pressure sump
I also found the "good suction" bit quite unclear, as it does not properly relate to the question. That is why I selected the fact that a suction filter is used to filter out dust and any foreign particles from contaminating the oil. I doubt a suction filter would optimize the compressor's operation by controlling a "good suction" pressure. There are controls that ensure proper suction pressure setting. Do you think my answer (dust/particle filtration) is the better of the two?
francophonesTakes a licking, keeps on ticking.
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08-12-2005, 09:24 PM #13
Re: apprentice requesting answers
Hello slingblade! Francophones is a combination of two words in one. Franco is latin for French. Phones is greek
for Voices (literally). Therefore, a Francophone signifies, in literal terms, Frenchvoice. It is anyone who speaks french as a 1st language. Anglophone signifies that an individual speaks english as a first language. I can see how the latin/greek roots can be confusing. Hope this clarifies the meaning.The workers have nothing to lose but their chains.
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28-12-2005, 03:51 AM #14
Re: apprentice requesting answers
for Q1
I think the correct key is b c d, because the a b c are all high side in refrigeration system.
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28-12-2005, 09:57 AM #15
Re: apprentice requesting answers
David
I think youve had too much rice wine
Did you just wake up from your stupor??
psss........Ignore me, just my New Years humour kicking in
Question was asked like two months ago !!Any opinions, statements and facts expressed in this message do not constitute legal advice in any shape or form and is given for a general outlook in nature. You are advised to seek appropriate and specific professional assistance from a regulated and authorised advisor for definitive advice.
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16-01-2006, 11:11 PM #16
Re: apprentice requesting answers
I took a company HVAC test for a service tech position. There were two questions to be answered by referring to a schematic at the bottom of the page, A ladder diagram of a low volt circuit. The question was ,"If there was a short in the circuit, what components would not work as a result? It referrenced a point Y on the power side of a 24 volt transformer, and point B on the other side of the "fan on" switch. Now, I am only aware of two kinds of shorts; A short-to-ground, and a turn-to-turn short in a motor's windings. I answered that nothing would work because a short in the low voltage circuit (short-to-ground) would burn out the transformer, since there was no fuse protecting the transformer in the diagram. The test proctor could not explain what type of short it was referring to. Did I miss that one?
Last edited by mccoolair@yahoo; 16-01-2006 at 11:15 PM.
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25-01-2006, 08:37 AM #17
Re: apprentice requesting answers
active - neutral short ???????????????????????????????????????????????????????????????????????????????????????????????????? ??
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