Tpc 434

Question 1

The function of the evaporator is to ______ heat from from the _______.

Answer 1

1. Remove
2. Material being cooled

Question 2

The capacity of an evaporator is affected by the…

Answer 2

Cleanliness of the evaporator

Question 3

Basic evaporator configurations depend on whether they have one or more tubes and whether or not they have?

Answer 3

Extended surface areas

Question 4

How many expansion valves do multiple circuit evaporators have?

Answer 4

One ( single expansion valve )

Question 5

A comfort cooler _____ the humidity of moist air by cooling the air to a temperature ______.

Answer 5

1. Reduces
2. Below the dew point

Question 6

Unlike a dry expansion evaporator, refrigerant in a flooded evaporator enters as ____ liquid and exits as _____ vapor.

Answer 6

1. All
2. Part

Question 7

In a secondary refrigeration system, the refrigerant removes heat from the material to be cooled. This refrigerant then transfers heat to the ______ refrigerant. The ______ refrigerant then boils.

Answer 7

1. Secondary
2. Primary

Question 8

Brines containing the exact amount of salt required to reach the lowest possible freezing point are called?

Answer 8

Eutectic solutions

Question 9

Which evaporator offers the greatest flexibility?

Answer 9

Two evaporators in parallel with each there own expansion valve

Question 10

A cascade refrigeration system has more than one?

Answer 10

Compressor, evaporator, condenser, refrigerant

Question 11

That law of thermodynamics that affects refrigeration cooling is?

Answer 11

Heat will flow from a warmer substance to a colder substance, but never in reverse

Question 12

How do you increase the net refrigeration effect?

Answer 12

By subcooling the refrigerant

Question 13

What is an advantage of using a heat exchanger?

Answer 13

Superheating the suction vapor, reduces the chances of liquid refrigerant entering the compressor

Question 14

The amount of oil entering an evaporator can be reduced by using?

Answer 14

A oil separator

Question 15

If the fluid flows through the evaporator it is better because there is an?

Answer 15

Increased temperature difference across the wall of the evaporator

Question 16

An evaporator can be defrosted by?

Answer 16

Reversing the flow of refrigerant

Question 17

To remove rust, scale, and sludge from a shell and tube evaporator you should use a?

Answer 17

Brush

Question 18

A water coil can be winterized by draining out the water and…

Answer 18

Leaving the coil dry for the winter

Question 19

Frost build up on an evaporator coil is increased by?

Answer 19

Low airflow and excessive moisture

Question 20

Bent fins reduce the cooling capacity of an evaporator by…

Answer 20

Reducing the area exposed to air

Question 21

What is a mechanism that feeds refrigerant into the evaporator?

Answer 21

A metering device

Question 22

The operation of an AXV is controlled by the…

Answer 22

Pressure in the evaporator

Question 23

In controlling the flow of refrigerant into a flooded evaporator, the float of a high-side float valve is located at the?

Answer 23

High pressure side of the valve port

Question 24

If floodback occurs in a system using an AXV a likely cause is?

Answer 24

Ice on the spring chambers above the diaphragm

Question 25

A common problem with TXVs is ice in the valve port, the proper way to correct this problem is to?

Answer 25

Replace the filter drier