100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
Z-51 REFRIGERATION TEST With Correct Solutions 2024 Update $12.99
Add to cart
Quickly navigate to
Preview
  2.  
  3. FDNY Z51
  4.  
  5. FDNY z51

Exam (elaborations)

Z-51 REFRIGERATION TEST With Correct Solutions 2024 Update
 1 purchase
  • Course
  • FDNY z51
  • Institution
  • FDNY Z51

Z-51 REFRIGERATION TEST With Correct Solutions 2024 Update Efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the following, a more efficient centrifugal compressor operation results from: - Answer -Lowering the condensing pressure The heat removed from the r...

[Show more]

Preview 2 out of 15  pages

Document information

  • April 12, 2024
  • 15
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • z 51 refrigeration test with correct solutions
  • z 51 refrigeration test 2024
  • z 51 refrigeration test 2025
  • efficiency of the refrigerant cycle is affected by

Written for

  • FDNY z51
  • FDNY z51

Seller

avatar-seller
AdelineJean

Reviews received

Content preview

Z-51 REFRIGERATION TEST With Co rrect Solutions 2024 Update Efficiency of the refrigerant cycle is affected by the operations of the condenser. Of the following, a more efficient centrifugal compressor operation results from: - Answer -Lowering the condensing pressure The heat removed from the refrigerant in a condenser is: - Answer -Sensible and latent heat The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdraw refrigerant for storage in suitable containers. According to the NYC Fire Code, you must ensure that the containers: - Answer -Are approved by the US Dept. of Transportation Which of the following best describes how the cylinder unloader works? - Answer -Keep in the suction valve opened while the compressor is in the return stroke In most semi -hermetic compressors, the suction vapor is used to: - Answer -Cool the motor The amount of refrigerant that flows through the orifices of an economizer is determined by the: - Answer -Differences between the high side and low side pressure The installation of an inline refrigerant cleaning system is advisable: - Answer -To remove impurities from the system The type of refrigerant system that is least likely to leak refrigerant into the building space that are being cooled: - Answer -Indirect system The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this compressor is 120 PSIG. The atmospheric is 14.7 PSI. The compression ratio for the given condition is closest to: - Answer -1.69 A superheated vapor is: - Answer -Dry vapor above the saturation temperature A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following, the most likely cause for this condition is: - Answer -A faulty cooling tower water level controller A centrifugal water pump is known as a lift pump when the: - Answer -The water supply to the pump suction inlet is below the pump level A TXV is used to maintain constant: - Answer -Evaporator superheat The chilled water supply to the building is 55 deg F. If the chiller is being used for human comfort, should you be concerned about this, and why? - Answer -Yes, this temp is too high for human comfort purposes The packing gland of a centrifugal pump serves to: - Answer -The drip part of the packing gland gives evidence that there is water in the pump Capacity control of reciprocating hermetic compressor is typically achieved through: - Answer -Operation of the hot gas bypass valve The most important reason to sub -cool the refrigerant in the condenser is to ensure that: - Answer -A pure liquid refrigerant will enter the metering device A refrigeration engineer is logging readings from a reciprocating system. Compressor discharge temperature have dropped significantly and the suction line pressure is high. Which of the following that may be causing this set of condition? - Answer -An expansion valve that is open too wide A low side float valve is used to maintain: - Answer -The level of the refrigerant in the evaporator Regarding fire safety, which ASHRAE refrigerant safety classification indicates no flammability and lower toxicity? - Answer -A1 When an expansion valve is operating properly, at the end of the evaporator will contain: - Answer -Only superheated vapor What information is not contained in a Material Safety Data Sheet? - Answer -Cost of the material In a steam turbine, what is the function of the Kingsbury thrust bearing? - Answer -Maintain axial positioning of the rotor shaft A centrifugal water pump is considered to the fully primed when? - Answer -The pump is full of liquid Copper tubing refrigerant lines must be installed for a new system. It is a well known service practice that tubing collapses at bends that must be made, the refrigerant engineer should use? - Answer -Level type tubing bender A reciprocating compressor is making a knocking sound during operation. If the refrigerant worn parts are not causing the knocking, what probably the cause? - Answer -Slugging of the liquid refrigerant In order for a refrigerant to become superheated, it must be heated in a section of the low side refrigerant line: - Answer -Where no liquid refrigerant is present All liquid has been recovered from a system to be overhauled, the system: - Answer -Should not be opened until all vapor has been recovered When a refrigerant engineer uses a portable compressor recovery unit to remove vapor refrigerant from a refrigeration system the removal rate of the refrigerant will gradually slow down because? - Answer -
The compressor efficiency is decreasing You are the engineer running a 2000 -ton (steam driven turbine) centrifugal refrigeration system, a refrigeration system supplies chilled water to a college campus with multiple buildings. During the course of making your rounds, you check the 9 cell cooling tower on the roof. You note the water level in all of the cooling tower cells is very low. Which one of the following immediate actions would take? - Answer -
Add additional make up water to the cooling tower

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 AdelineJean. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

68175 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 15 years now

Start selling
$12.99  1x  sold
  • (0)
Add to cart
Added