Unit 25 - Chapter 117

Question 0

An evaporator that contains only a small amount of liquid refrigerant at any time is what type of evaporator?

Answer 0

Dry

Question 1

The two types of evaporators differ in the

Answer 1

Method of refrigerant circulation

Question 2

Refrigerant evaporators

Answer 2

Are used to transfer heat

Question 3

The evaporator which increases heat exchange by crimping thin metal plates to its form is which type?

Answer 3

Finned tube

Question 4

The evaporator which can be easily cleaned without interruption is which type?

Answer 4

Plate surface

Question 5

Which statement about shell and tube evaporators is false?

Answer 5

Liquid to be cooled circulates through tubes in the direct expansion operation

Question 6

Air cooled condensers of large capacities are found mainly in which locations

Answer 6

Roof tops

Question 7

Which statement about double tube condensers is true?

Answer 7

Water flow in inner tube is in the opposite direction of flow of refrigerant

Question 8

The condenser which is very expensive to clean and requires tube to be cleaned with acid and neutralized is the

Answer 8

Shell and coil

Question 9

The amount of water used in an evaporative condenser is only a small percentage of that used in a water condenser of same capacity due to

Answer 9

Water evaporating requires a large amount of latent heat

Question 10

Common types of water cooler condensers are

Answer 10

• shell and tube
• shell and coil
• double tube

Question 11

Defective condensers are a results of

Answer 11

• scale forming chemicals
• dirty cooling water
• non condensable gases
• low coolant circulation
  NOT compressor lubricating oil

Question 12

The purpose of a condenser is to

Answer 12

Remove latent heat from refrigerant

Question 13

The amount of water used in an evaporative condenser is less because

Answer 13

The cooling water evaporates, removing far more heat per kilogram of system coolant

Question 14

Which statement about shell and tube evaporator is false?

Answer 14

The brine circulates through the tubes in a direct expansion chiller

Question 15

The amount of heat absorbed by water when it evaporates is

Answer 15

2257 kJ/kg

Question 16

Which is not a common type of refrigeration condenser?

Answer 16

Flooded

Question 17

Which evaporator require the greatest refrigerant change?

Answer 17

Flooded

Question 18

The refrigerant condenser design that requires the tubes to be cleaned with acid and neutralized is the

Answer 18

Shell and coil

Question 19

Which is not a cause of poor condenser performance?

Answer 19

Inadequate refrigerant charge

Question 20

All evaporators

Answer 20

Boil liquid refrigerant at low pressure and temperature

Question 21

Which is not a type of evaporator?

Answer 21

Double tube