Search Header Logo
Multi stage vapour compression

Multi stage vapour compression

Assessment

Presentation

Science

Vocational training

Practice Problem

Medium

Created by

Jermaine Taffe

Used 2+ times

FREE Resource

37 Slides • 15 Questions

1

media
media

2

media

3

Multiple Choice

What is the significance of using multi-stage vapour compression refrigeration systems in industrial applications?

1

They allow for higher temperature lifts, making them suitable for processes requiring very low evaporator or very high condensing temperatures.

2

They are only used for small-scale household refrigeration.

3

They reduce the need for temperature control in chemical industries.

4

They eliminate the use of condensers in refrigeration systems.

4

media

5

Multiple Choice

Which of the following is a consequence of increasing temperature lift in single stage refrigeration systems?

1

The system becomes more efficient

2

The system becomes impractical

3

The system operates at lower pressures

4

The system requires less energy

6

media

7

media

8

Multiple Choice

For fluorocarbon and ammonia based refrigeration systems, which system is used for temperatures below -60°C?

1

Single stage system

2

Two-stage system

3

Three-stage system

4

Cascade system

9

media

10

media

11

Multiple Select

Which of the following are classifications of multi-stage refrigeration systems?

1

Multi-compression systems

2

Multi-evaporator systems

3

Cascade systems

4

Single stage systems

12

media

13

media

14

media

15

Multiple Select

Which of the following statements about the saturated liquid and vapour in the flash tank is/are correct?

1

The saturated liquid at point 8 is fed to the evaporator after throttling.

2

The saturated vapour at point 3 is compressed to condenser pressure.

3

The saturated vapour at point 3 is throttled to evaporator pressure.

4

The saturated liquid at point 3 is compressed to condenser pressure.

16

Multiple Choice

What is the main function of a flash tank in a refrigeration system?

1

To separate refrigerant liquid and vapour at intermediate pressure

2

To compress refrigerant to high pressure

3

To cool the refrigerant

4

To heat the refrigerant

17

media

18

media

19

media

Water cooled = Closed Intercooling, Flash Tank = open intercooling

20

media

21

Multiple Select

Which methods can be used to achieve intercooling of vapour in multi-stage compression systems?

1

Water-cooled heat exchanger

2

Refrigerant in the flash tank

3

Direct expansion

4

Air-cooled condenser

22

media

23

Multiple Choice

What is one benefit of intercooling in a compressor system?

1

It increases compressor discharge temperature

2

It reduces work input and improves lubrication

3

It saturates the refrigerant at the inlet

4

It increases mass flow rate

24

media

25

media

26

media

27

Multiple Choice

Which of the following statements about intercooling using liquid refrigerant is correct?

1

It is always effective for all refrigerants

2

It is not effective for R12 and R22

3

It increases power input for ammonia

4

It reduces compressor discharge temperature for R12

28

media

29

media

30

Multiple Choice

Which of the following is a disadvantage of the multi-stage system with flash gas removal and intercooling?

1

Reduced compressor discharge temperature

2

Higher refrigerating effect

3

Possibility of liquid flashing ahead of the expansion valve

4

Lower pressure drop

31

media

32

Multiple Choice

What is the primary function of the liquid subcooler in the refrigeration system shown in the diagram?

1

To increase the temperature of the refrigerant before entering the evaporator

2

To reduce the temperature of the refrigerant before entering the expansion valve

3

To compress the refrigerant vapor

4

To remove moisture from the refrigerant

33

media

34

media

( Open Intercooling )

35

Multiple Select

Which components are common to both the flash tank system for flash gas removal and the flash tank system for intercooling only?

1

Compressor - I and Compressor - II

2

Evaporator and Condenser

3

Flash chamber and Expansion valve

4

All of the above

36

media

37

Multiple Choice

In the two-stage system with flash tank for intercooling only, what is the purpose of the intercooler located between the first and second stage compressors?

1

To increase the pressure of the refrigerant

2

To reduce the temperature of the refrigerant vapor before entering the second stage compressor

3

To separate liquid and vapor phases

4

To condense the refrigerant

38

media

39

media

40

media

41

media

42

media

43

media

44

media

45

media

46

media

47

media

48

media

49

media
  • Heat Pump Systems

50

media

51

Multiple Choice

In which industry might you require an evaporator temperature as low as -40°C?

1

Frozen food industry

2

Chemical industry

3

Pharmaceutical industry

4

Textile industry

52

Open Ended

Explain why multi-stage vapour compression refrigeration systems are preferred over single stage systems in certain industrial applications.

media
media

Show answer

Auto Play

Slide 1 / 52

SLIDE