Unit 25 - Chapter 115 Flashcards

0
Q

Raising the condensing point of the refrigerant vapour above the temperature of the cooling medium is a function of the

A

Compressor

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1
Q

Which of the following are principal parts in a closed cycle compression refrigeration system?

A
  • Evaporator
  • compressor
  • condenser
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2
Q

Which is not a component of the low pressure side of the system?

A

Compressor discharge

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3
Q

The temperature in the evaporator

A

Depends in the pressure in the evaporator

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4
Q

A purpose of a liquid refrigerant control or regulating valve is

A

To regulate the refrigerant flow to the evaporator

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5
Q

Refrigerant condensers

A

Cool the gas refrigerant discharged from the compressor

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6
Q

For a direct expansion system which statement is true?

A

The evaporator can be located in air circulating ducts communicating with the material or space being refrigerated

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7
Q

The primary difference between direct and indirect refrigeration system is the

A

Evaporator location

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8
Q

Which statement about a system that circulates warm brine or water back to a chiller tank is true?

A

The evaporator cools the brine or water

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9
Q

The type of brine used for skating or hockey rink refrigeration systems is usually

A

Calcium chloride

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10
Q

Refrigerant evaporators

A

May have brine pumped past the coils in an indirect system

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11
Q

Which is not an advantage of a factory assembled packaged refrigerant?

A

Parts can be ordered and installed separately

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12
Q

Which statement about economizers is false?

A

Controls the flow of liquid refrigerant from the low pressure evaporator to the high pressure condenser

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13
Q

Which is a result of an economizer on the refrigeration system?

A
  • an inter cooling effect on the compressor
  • reduction of the power required for compression in the second stage compressor
  • reduction of flash vapour in the evaporator
  • increase in the refrigerating capacity of a system
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14
Q

In actual systems there will be a gradual pressure drop through each side of the system due to

A

Friction in the evaporator, condenser, and piping

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15
Q

What is the term used to describe the device used on a centrifugal chiller to improve efficiency and provide an intercooling effect?

A

Economizer

16
Q

Another name for a direct refrigeration system is

A

A direct expansion system

17
Q

Which is not an advantage of factory assembled packaged refrigeration units?

A

The final installation must be according to code

18
Q

In the evaporator of a refrigeration system

A

The refrigerant absorbs heat from the surrounding medium

19
Q

A controlled amount of high temperature high pressure liquid refrigerant

A

Passes through the regulating valve of the evaporator

20
Q

The brine pump of a refrigeration system

A

Circulates the brine through the cooling circuits

21
Q

Refrigerant condensers

A

Cool the gas refrigerant discharged from the compressor