Interview written test

[francium]

Hi i've got an interview next week with an A/C company the first part of the inverview is a written test and i've got no idea what to expect? They've told me to swat up on vrv's and refrigeration knowledge. My theory is ok but got no idea what they'll ask about vrv's.

[The Viking]

What 3 tasks during the install/commissioning are the most important to ensure a long and trouble free lifespan of the system? Why?

What is the difference between a 2 pipe and a 3 pipe system?

What is the function of a MCU/BC/MC box?

How many MCU/BC/MC boxes would you expect to find on a 2 pipe system?

For an engineer, what is the most important difference between mineral and synthetic oil? Why is synthetic oil used?

When does the (VRV/VRF) outdoor unit work the hardest? All idu in cooling, all idu in heating or half n' half?

What is the difference between HR and HP?

What is the main reason to choose a 3 pipe system over a 2 pipe system?

Why when we mentioned 2 & 3 pipe systems above does Mitsubishi Electric's City Multi systems not follow the same theories? How is this achieved?

Describe how you would replace an idu's EEV.
Describe how you would replace a compressor.

In heating the system is running with a discharge temperature of 98ºC, why would this be? If this is allowed to continue what is the likely outcome?

After you achieved a 8000 micron vacuum and isolated the vacuum pump, the gauge is slowly rising. Give 3 reasons why this might happen.
How can you determine which of the 3 reasons above is the culprit?


OK,
That's the type of questions I would ask.
If you do know what brands you would be working on then the questions can obviously be more targeted.


Good Luck!

[francium]

they mostly work with daikin and mitsubishi i belive, thanks a lot.

[r.bartlett]

What 3 tasks during the install/commissioning are the most important to ensure a long and trouble free lifespan of the system? Why?

What is the difference between a 2 pipe and a 3 pipe system?

What is the function of a MCU/BC/MC box?

How many MCU/BC/MC boxes would you expect to find on a 2 pipe system?

For an engineer, what is the most important difference between mineral and synthetic oil? Why is synthetic oil used?

When does the (VRV/VRF) outdoor unit work the hardest? All idu in cooling, all idu in heating or half n' half?

What is the difference between HR and HP?

What is the main reason to choose a 3 pipe system over a 2 pipe system?

Why when we mentioned 2 & 3 pipe systems above does Mitsubishi Electric's City Multi systems not follow the same theories? How is this achieved?

Describe how you would replace an idu's EEV.
Describe how you would replace a compressor.

In heating the system is running with a discharge temperature of 98ºC, why would this be? If this is allowed to continue what is the likely outcome?

After you achieved a 8000 micron vacuum and isolated the vacuum pump, the gauge is slowly rising. Give 3 reasons why this might happen.
How can you determine which of the 3 reasons above is the culprit?


OK,
That's the type of questions I would ask.
If you do know what brands you would be working on then the questions can obviously be more targeted.


Good Luck!

I just failed the interview..

[Grizzly]

I just failed the interview..

Me too!
Grizzly

[The Viking]

Hang on,

I didn't write it in swedish, did I? ???

[frank]

Makes sense to me ��

Good questions Viking

[monkey spanners]

There may be some health and safety type questions too, would be worth refreshing yourself on ppe and method statements etc

[install monkey]

difference between a 2 pipe and a 3 pipe is an extra pipe

[cadwaladr]

And the difference between a 2 pipe system a 3 pipe system is 1 less pipe

[Magoo]

You and me Grizzly
Think I will stick with ammonia.
But seriously, good that employers are screening job applicants with actual tests for system knowledge. Here we have a 3 month test/ proving period before full employment. If they don't cut the mustard then see you by.

[PaulZ]

Hi Magoo
I am with you and Grizzly I will stay with the industrial stuff. It's the same in Australia, 3 month probationary period, if you can't it from the head to the hands then no matter how well you do in a written test you will struggle on site.
BTW I failed Vikings test as well.
Regards
Paul

[The Viking]

Hmm,
So many respected members stating they would fail...

Let me clarify,
To me the written test on it's own is not a pass or fail, it is about what else it tell me.
- Can you read and write, will I be able to read your service reports?
- Is the claims you made in your CV backed up by knowledge or did you just google it?
- Are you able to verbally argue for your viewpoints during the interview?

So if your CV tell me that you worked as a VRV/VRF system specialist for the last 10 years and you don't know that a 3 pipe system (Heat Recovery-HR) are able to provide simultaneous heating/cooling whilst the 2 pipe system (Heat Pump-HP) does one or the other for the whole system... Yes, then you failed.
But if you on the other hand didn't state in your CV that you had extensive VRV/VRF experience then that lack of knowledge would not be held against you.

BTW,
Not even my answers to those questions might be the "right" ones but you will get a good argument about it afterwards.

[Josip]

Hi, I failed too

anyhow I'll stick with ammonia too, Magoo do you need some apprentice ..

Best regards, Josip

[PaulZ]

Hi Viking
Of course you are right different people have a different knowledge base, I think some of us took the simplistic view, I am pretty sure we all knew what you were getting at.
I certainly know very little about VRV/VRF systems as I never work on them so I would never include anything about them on my CV and because of that I would never apply for an A/C job.
Appropriate interview questions are always a good way of determining if the persons knowledge matches their stated claims, best thing is to be truthful on your CV.
Regards
Paul