Exam (elaborations)
ESCO Light Commercial Refrigeration EXAM 2022
- Course
- Institution
ESCO Light Commercial Refrigeration EXAM 2022
[Show more]
Content preview
ESCO Light Commercial Refrigeration EXAM2024/2025 with Complete Solutions.
If converting from mineral oil to POE oil, what is considered to be the industry
standard for residual mineral oil content? - ANSWER 5%
When converting to POE from mineral oil, what can be used to determine residual
mineral oil content? - ANSWER Refractometer
Oil conversion test kit
Some refrigerants are now being phased out due to their - ANSWER Global
warming potential (GWP)
Which currently used refrigerant category is quickly disappearing due to its ozone
depletion potential? - ANSWER HCFC
An orange refrigerant container is typically - ANSWER 404a
When three refrigerants make up a new refrigerant it is considered to be a -
ANSWER Ternary blend
The difference between bubble point and dew point temperatures is called -
ANSWER Temperature glide
Which of the following categories of refrigerant is least harmful to the environment? -
ANSWER HC
One of the refrigerants now being used in small refrigerant quantities in self-
contained systems is - ANSWER R-290
Which "series" of refrigerants should be charged into a system as a liquid? -
ANSWER 400
What is fractionation? - ANSWER The separation of a blended refrigerant in the
evaporator or condenser
Which of the following oils may be used with most typical refrigerants used today? -
ANSWER POE
The term used to describe the ability to hold moisture is known as - ANSWER
Hygroscopicity
A light blue refrigerant container is typically - ANSWER 134a
Which oil is shipped in metal containers? - ANSWER POE
, A 400 series refrigerant should use_______ when calculating superheat. - ANSWER
Dew point temperature
A blend should be charged - ANSWER In the liquid state, but in a controlled
metered condition into the suction side
Which of the following lubricants is considered the most hygroscopic used in
stationary refrigeration equipment? - ANSWER Polyolester (POE)
The main chemical that harms the ozone layer is - ANSWER Chlorine
What refrigerant was mainly used in low temp refrigeration before HFC 404a was
created? - ANSWER 502
When switching from one refrigerant type to another you should do what? -
ANSWER Perform a pump out procedure as per the unit's operating instructions
A working system may result in a quicker recovery rate by allowing it to operate and
purge liquid directly into the recovery cylinder. - ANSWER True
A recovery cylinder should never be filled - ANSWER More than 80% full
The removal of refrigerant in any state from a system is called - ANSWER Recovery
Which of the following would be a correctly filled "30 pound" recovery cylinder if it
weighs 18 pounds when empty? - ANSWER 42 pounds
Refrigerant can be resold to a new owner if it is - ANSWER As long as it meets
AHRI standard 700
How much can a refrigeration system containing 18 pounds of refrigerant legally leak
annually according to EPA rules? - ANSWER 100% of total charge
Recovered refrigerant cannot be placed back into the system it has been recovered
from unless - ANSWER There is no limitation to putting refrigerant back into the
same system as long as it is not contaminated
To determine the full weight of a recovery cylinder, which of the following IS NOT
required to be known - ANSWER Condition of recovered refrigerant
It is still necessary to recover the entire refrigerant when a section of the system can
be isolated with service valves - ANSWER False
Which of the following refrigerant(s) is/are required to be recovered as per EPA
rules? (Check all that apply) - ANSWER HFC-404a
It is best to remove refrigerant in what state? - ANSWER Liquid
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller leonardmuriithi061. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $17.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81113 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now