HVAC FINAL GRADED A
Which of the following would have the greatest effect on the heat content of the refrigerant?
A) The refrigerant's humidity
B) The refrigerant's state
C) The refrigerant's temperature
D) The refrigerant's pressure ️Correct Answer
B)
The refrigerant's state
...
HVAC FINAL GRADED A Which of the following would have the greatest effect on the heat content of the refrigerant? A) The refrigerant's humidity B) The refrigerant's state C) The refrigerant's temperature D) The refrigerant's pressure ✔️Correct Answer B) The refrigerant's state A mechanical refrigeration system cools a room by: ✔️Removing heat from the room. The four types of cooling mechanisms are: ✔️Evaporative, Thermoelectric, Absorption, Mechanical Compression. Refrigeration can be defined as: ✔️It moves the heat from the refrigerated area to another area. Which of the following systems uses compression pumps and condensers to cool the air? A) Evaporative system B) Thermoelectric system C) Absor ption system D) Mechanical compression system ✔️Correct Response D) Mechanical compression system Which of the four types of refrigeration systems cools the air without removing any heat from the air? ✔️Evaporative systems The order of the four main components of the refrigeration cycle is: ✔️Compressor - condenser - metering device - evaporator. The small line on a split system air conditioning unit is the: ✔️Liquid line. Where is the liquid receiver located? ✔️On the hig h side just after the condenser The line that connects the condenser to the metering device is called the: ✔️Liquid line. The discharge, liquid, and suction lines of a packaged unit are: ✔️Located inside the unit. The difference between a liquid receive r and a suction accumulator is that: ✔️Receivers only allow liquid to leave while accumulators only allow vapor to leave. On an R410A air conditioning system, the refrigerant leaving the ________ is 118 psig, 50°F, 100% superheated gas ✔️evaporator Optio nal components on the high side of a refrigeration system include: ✔️Discharge line muffler, oil separator, liquid receiver, and liquid line filter -drier. Optional components found on the low side of a refrigeration system include: ✔️Suction line filter, accumulator, and evaporator pressure regulator. The line that connects the evaporator to the compressor is called the: ✔️Suction line. The refrigerant is a high -pressure, warm, subcooled liquid at the inlet of the metering device. The state of the refrig erant is: ✔️100% liquid. Which of the two refrigerant lines going to the compressor is larger? ✔️The low pressure suction line The two refrigerant lines connecting the inside and outside units of a split system air conditioner are: ✔️Suction line and liq uid line. Where is the suction accumulator located? ✔️On the low side just before the compressor The line that connects the compressor to the condenser is called the: ✔️Discharge line. Which of the following compressors is not considered a positive displacement compressor? A) Reciprocating B) Screw C) Rotary D) Centrifugal ✔️Correct Response D) Centrifugal What is the lowest percentage of full capacity that a digital scroll can be s afely operated for extended periods? ✔️The minimum capacity is 10% to insure that the compressor gets proper lubrication. How does a reciprocating compressor operate? ✔️In a reciprocating compressor, the piston is driven up and down in the cylinder by the connecting rod and crankshaft. Operating a hermetic compressor in a vacuum: ✔️Can cause the motor to arc out because of the change in electrical resistance. The function of the compressor in the refrigeration cycle is: ✔️Raise the pressure and temperatu re of the refrigerant. A compressor that compresses gas between a fixed spiral and an orbiting spiral is a: ✔️Scroll compressor. An oil slinger is used with reciprocating compressors that are lubricated by: ✔️Splash lubrication. Which of the following i s true of a medium -temperature refrigeration unit? A) It requires 1 hp to produce 1 -1/3 tons of cooling. B) It requires 1 hp to produce 1 ton of cooling. C) It requires 1 hp to produce 1/3 ton of cooling. D) It requires 1 hp to produce 2/3 ton of cool ing. ✔️Correct Answer D) It requires 1 hp to produce 2/3 ton of cooling. What type of compressors contain the compressor and motor together inside a welded steel housing? ✔️Hermetic compressors All refrigeration compressors are designed to pump: ✔️Only vapor. Above what temperature do most refrigerant oils begin to break down chemically? ✔️300°F The advantage of compliance in a scroll compressor is that: ✔️The orbiting scroll can separate and unload to pass a small liquid slug. Broken rods, broken valve plates, broken valves, and broken crankshafts are symptoms of what type of mechanical failure? ✔️Liquid slugging Which compressor has a piston that is driven up and down in the cylinder by a co nnecting rod and crankshaft? ✔️A reciprocating compressor The space left between the piston and the valve plate of a reciprocating compressor when the piston is at the top of the cylinder is called: ✔️The clearance volume.
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 CertifiedGrades. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.49. You're not tied to anything after your purchase.
