Commercial Refrigeration Test Chapter 8, 9 Exam Questions and Answers
5 views 0 purchase
Module
Refrigeration machine operator
Institution
Refrigeration Machine Operator
How do you charge an R134a refrigerator with a cap tube system? - Answer-Weigh in the charge per the nameplate.
What is the best thing to do before evacuating a refrigeration system? - Answer-Evacuate the gauge and pump connections to ensure all connections are tight.
If a micron gauge is not...
how do you charge an r134a refrigerator with a cap
Written for
Refrigeration machine operator
Refrigeration machine operator
Seller
Follow
lectknancy
Reviews received
Content preview
Commercial Refrigeration Test Chapter
8, 9 Exam Questions and Answers
How do you charge an R134a refrigerator with a cap tube system? - Answer-Weigh in
the charge per the nameplate.
What is the best thing to do before evacuating a refrigeration system? - Answer-
Evacuate the gauge and pump connections to ensure all connections are tight.
If a micron gauge is not working properly, what is the first thing to do to correct it? -
Answer-Pour alcohol into the inlet port to clean oil out of it.
In the "real world" how often is it practical to replace the oil in a vacuum pump? -
Answer-Vacuum pumps must always have their oil changed after each use.
What precautions should be taken when charging liquid through the suction service
valve? - Answer-Restrict the flow of liquid if the amperage is above 10% of RLA or the
valve frosts
What are some of the considerations when charging refrigerant into the system high
side? - Answer-The unit capacity is over 5 pounds, in a vacuum, and the compressor is
off.
Why is the compressor started in the 2nd part of a triple evacuation? - Answer-To
release moisture that may be trapped in the oil.
Which of the following will damage a 3Ø motor? - Answer-Loss of phase or a voltage
imbalance over 2%.
If you need a 30 amp compressor contactor, which of the following is the best choice -
Answer-30 amp inductive - 20 amp resistive
The incoming voltage to a contactor is 240 and the voltage leaving is 235. What is the
proper corrective action necessary? - Answer-Replace the contacts or the contactor.
Why are starting components needed on a 1Ø compressor motor? - Answer-Single
phase motors need a phase shift in order to start the rotor turning.
The proper wiring sequence for a potential relay is: - Answer-5 (common), 2 (start), 1
(run)
When troubleshooting a potential relay, the terminals 5, 2, and 1 refer to: - Answer-.5
and 2 are the coil, 1 and 2 are the relay contacts.
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 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 lectknancy. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £6.93. You're not tied to anything after your purchase.
