Chapter 19 Heat Exchangers for Refrigeration Systems

Question 1

1. Based on how they operate one of the basic types of evaporator is the \_\_\_\_\_
evaporator.
A. Dry/indirect expansion
B. Evaporative
C. Aerial
D. Cold expansion
E. Flooded

Answer 1

E. Flooded

Question 2

2. One of the general types of condensers is the \_\_\_\_\_ condenser.
A. Flooded
B. Dry
C. Direct expansion
D. Bare tube
E. Evaporative

Answer 2

E. Evaporative

Question 3

3. One of the general types of condensers is the \_\_\_\_\_ condenser.
A. Flooded
B. Dry
C. Air-cooled
D. Direct expansion
E. Bare tube

Answer 3

C. Air-cooled

Question 4

4. One of the main heat exchangers used in the compression refrigeration system is
the:
A. Evaporator
B. Compressor
C. Absorber
D. Regenerator
E. Cooling tower

Answer 4

A. Evaporator

Question 5

5. The shell and tube evaporator is also known as a:
A. Cooler
B. Chiller
C. Condenser
D. Evaporator
E. Heat exchanger

Answer 5

B. Chiller

Question 6

6. The air-cooled condenser has the refrigerant vapour flowing _____ while the
   cooling air is circulated _____.
   A. Through finned tubes, around the outside of the tubes
   B. Around the outside of the tubes, through finned tubes
   C. Through bare tubes, around the outside of the tubes
   D. Through finned tubes, around the outside of the bare tubes
   E. Around the outside of the tubes, through bare tubes

Answer 6

A. Through finned tubes, around the outside of the tubes

Question 7

7. The finned tube evaporator is basically a bare tube evaporator coil with fins
   attached to it by crimping or bonding to form a/an:
   A. Increased heat exchange surface area
   B. Decreased heat exchange surface area
   C. Increased temperature exchange surface area
   D. Decreased temperature exchange surface area
   E. Increased heat exchange volume

Answer 7

A. Increased heat exchange surface area

Question 8

8. Evaporative condensers are favored in locations where it is necessary to conserve
on:
A. Power
B. Space
C. Water
D. Noise
E. Air

Answer 8

C. Water

Question 9

9. A proper chemical treatment program for evaporative condensers includes a/an:
   A. Oxygen scavenger
   B. Scale producer
   C. Precipitation agent
   D. Sludge conditioner
   E. Anti-foaming agent to prevent turbulence from creating foam in the sump

Answer 9

E. Anti-foaming agent to prevent turbulence from creating foam in the sump

Question 10

10.In the direct-expansion shell and tube evaporator, the liquid refrigerant is:
A. In the shell
B. Around the tubes
C. In the tubes
D. Over the tubes
E. Under the shell

Answer 10

C. In the tubes

Question 11

11.The function of the refrigeration condenser is to cool the superheated refrigerant
vapour until it _____ and then becomes sub-cooled.
A. Condenses to a vapour
B. Evaporates to a liquid
C. Evaporates to a vapour
D. Freezes
E. Condenses to a liquid

Answer 11

E. Condenses to a liquid

Question 12

12.One of the basic designs of water-cooled condensers is the \_\_\_\_\_ condenser:
A. Flooded
B. Double tube
C. Direct expansion
D. Bare tube
E. Evaporative

Answer 12

B. Double tube

Question 13

13.The shell and coil condenser consists of a horizontal or vertical steel shell which
contains a coiled tube, either bare or finned, through which the _____ circulates.
A. Cooling water
B. Refrigerant vapour
C. Refrigerant liquid
D. Cooling air
E. Condensate

Answer 13

A. Cooling water

Question 14

14.Bare tube evaporators are used when the space temperature is maintained below:
A. 15°C (59°F)
B. 10°C (50°F)
C. 5°C (41°F)
D. 1°C (34°F)
E. 20°C (68°F)

Answer 14

D. 1°C (34°F)

Question 15

15.The shell and tube condenser is fitted with:
A. End plates
B. Water boxes
C. Dry boxes
D. Wet boxes
E. Water plates

Answer 15

B. Water boxes