Book 2: 4-17 - "Compression Refrigeration Systems:"

Question 1

In the compression refrigeration system to condense the low-pressure, low-temperature vapour back to a liquid the _____ absorbed in the evaporator must be removed.
Select one:

A. Latent heat

B. Latent temperature

C. Sensible heat

D. Enthalpy

E. Sensible temperature

Answer 1

A. Latent heat

Question 2

As a general rule, in the compression refrigeration system the condensing temperature of the vapour will be approximately _______ higher than the temperature of the water when a water-cooled condenser is used.
Select one:

A. 15°C (59°F)

B. 11°C (20°F)

C. 5°C (41°F) to 10°C (50°F)

D. 20°C (68F) to 25°C (77°F)

E. 0°C (32°F) to 5°C (41°F)

Answer 2

B. 11°C (20°F)

Question 3

The high-pressure side of the compression refrigeration system consists of all except the:
Select one:

A. Upstream side of the regulating valve

B. Condenser

C. Compressor discharge

D. Receiver

E. Evaporator

Answer 3

E. Evaporator

Question 4

In the compression refrigeration system the low-pressure, low-temperature liquid/vapour mixture flows through the _____, absorbing heat from the surrounding medium.
Select one:

A. Regenerator

B. Compressor

C. Absorber

D. Evaporator

E. Condenser

Answer 4

D. Evaporator

Question 5

In air conditioning systems the air is not cooled any lower than:
Select one:

A. 13°C (55°F)

B. 10°C (50°F)

C. 25°C (77°F)

D. 15°C (59°F)

E. 18°C (64°F)

Answer 5

A. 13°C (55°F)

Question 6

In the compression refrigeration system the work done on the vapour during compression will cause an increase in the temperature of the vapour to a value that is higher than the saturation temperature corresponding to the vapours pressure. The condition of the vapour is said to be:
Select one:

A. Sub cooled

B. Superheated

C. Super cooled

D. Super saturated

E. Super tempered

Answer 6

B. Superheated

Question 7

Which of the following is not a principle component of a simple closed-cycle compression refrigeration system ?
Select one:

A. Liquid refrigerant control or regulating valve

B. Condenser

C. Liquid receiver

D. Regenerator

E. Evaporator

Answer 7

D. Regenerator

Question 8

The indirect compression refrigeration system is one in which a liquid, such as brine or water, is cooled by the:
Select one:

A. Regenerator

B. Condenser

C. Refrigerant

D. Evaporator

E. Absorber

Answer 8

C. Refrigerant

Question 9

In the compression refrigeration system the high-pressure, superheated vapour is discharged into the condenser where it gives up, first, the:
Select one:

A. Sensible heat

B. Enthalpy

C. Sensible temperature

D. Latent temperature

E. Latent heat

Answer 9

A. Sensible heat

Question 10

One of the classes of closed cycle mechanical refrigeration systems is the:
Select one:

A. Expansion system

B. Absorption system

C. Condensation system

D. Evaporation system

E. Regeneration system

Answer 10

B. Absorption system

Question 11

What brine temperature is used when cooling an ice surface?
Select one:

A. -5°C (23°F)

B. -25°C (-13°F)

C. -50°C (-58°F)

D. -18°C (0°F)

E. -11°C (12°F)

Answer 11

E. -11°C (12°F)

Question 12

The low-pressure side of the compression refrigeration system includes all except the:
Select one:

A. All interconnected tubing and piping

B. Suction of the compressor

C. Condenser

D. Downstream of the regulating valve

E. Evaporator

Answer 12

C. Condenser

Question 13

In the compression refrigeration system a controlled amount of _____ refrigerant passes through the regulating valve into the evaporator.
Select one:

A. High-pressure, high-temperature vapour

B. High-pressure, low-temperature vapour

C. High-pressure, low-temperature liquid

D. Low-pressure, high-temperature liquid

E. High-pressure, high-temperature liquid

Answer 13

E. High-pressure, high-temperature liquid

Question 14

One of the classes of closed cycle mechanical refrigeration systems is the:
Select one:

A. Condensation system

B. Regeneration system

C. Evaporation system

D. Expansion system

E. Compression system

Answer 14

E. Compression system

Question 15

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

A. Compressor

B. Expansion valve

C. Evaporator

D. Condenser

E. Economizer

Answer 15

E. Economizer

Question 16

A simple closed-cycle compression refrigeration system does NOT contain which of the following principal components?
Select one:

A. Evaporator

B. Liquid receiver

C. Condenser

D. Absorber

E. Compressor

Answer 16

D. Absorber

Question 17

In air conditioning systems the air is cooled by chilled water that is normally kept at or above:
Select one:

A. 5°C (41°F)

B. 0°C (32°F)

C. 10°C (50°F)

D. 15°C (59°F)

E. 13°C (55°F)

Answer 17

A. 5°C (41°F)

Question 18

In the compression refrigeration system the low pressure in the evaporator causes part of the entering liquid to flash into vapour, using the excess _____ in the liquid as latent heat of vaporization so that the remaining liquid cools down to its boiling point for that pressure.
Select one:

A. Sensible heat

B. Sensible temperature

C. Latent temperature

D. Latent heat

E. Enthalpy

Answer 18

A. Sensible heat

Question 19

In the closed cycle compression refrigeration system the compressor not only removes the vapour from the evaporator, but also keeps the pressure in the evaporator at a constant value, which gives the desired ________ temperature of the liquid refrigerant.
Select one:

A. Vaporization

B. Condensation

C. Expansion

D. Cooling

E. Regeneration

Answer 19

A. Vaporization

Question 20

In the compression refrigeration system the pressure in the evaporator is kept low by the:
Select one:

A. Regenerator

B. Evaporator

C. Condenser

D. Compressor

E. Absorber

Answer 20

D. Compressor