Vapor Compression System 1

1.

1 point

The compressor is located

at the dividing line between the high and low side.

in the high side of the system.

always in line with the expansion valve.

at the point of no pressure change.

in the low side of the system.

2.

1 point

Why do refrigeration compressors use water jackets?

To remove the heat of compression

To ensure the refrigerant gas is completely vaporized

To prevent the refrigerant from freezing in the cylinders

To prevent liquid slugging

3.

1 point

In a standard refrigeration cycle, the temperature in the evaporator is:

15 degrees Celsius.

30 degrees Celsius.

-20 degrees Celsius.

-34 degrees Celsius.

0 degrees Celsius.

4.

1 point

What is the refrigerating effect of one kilogram of ice at O degrees Celsius?

655 kJ/kg

233 kJ/kg

335 kJ/kg

144 kJ/kg

5.

1 point

What is a congealer?

The evaporator

The dryer

The expansion valve

The oil trap

6.

1 point

Which is an ideal refrigeration characteristic?

Low latent heat capacity

Low condensing pressure

Corrosiveness

High boiling point

An offensive odor

7.

1 point

In an atmospheric condenser

air is blown through the tubes.

water trickles over the outside of the tubes.

water flows through the inner tube.

water circulates between the outside and inside tubes.

8.

1 point

Carbon dioxide is rarely used as a refrigerant that much anymore because it

has a low latent heat capacity.

will support combustion.

has a high condensing pressure.

depletes the ozone layer.

causes suffocation.

9.

1 point

A refrigerant should

absorb a large amount of heat.

not stick to surfaces.

evaporate at a high pressure.

condense at a low temperature.

condense at a high pressure.

10.

1 point

The boiling point of ammonia at atmospheric pressure is:

-34 degrees Celsius.

34 degrees Celsius.

-20 degrees Celsius.

-15 degrees Celsius.

0 degrees Celsius.

11.

1 point

The King Valve is located

between the condenser and the receiver.

between the evaporator and the compressor.

at the highest point in the system for purging.

between the receiver and the evaporator.

on the condenser cooling water line.

12.

1 point

What is a disadvantage of carbon dioxide as a refrigerant?

Poisonous

Flammable

Corrosive

Expensive

13.

1 point

The heat used to change the state of a substance is called

specific heat.

sensible heat.

radiant heat.

latent heat.

14.

1 point

Where does the pipe take the refrigerant off from the receiver?

The bottom

The top

The side

The end

15.

1 point

The maximum amount of heat removed by an ice box with a 10 kg block of ice is

3350 kJ.

2330 kJ.

1103 kJ.

233 kJ.

33500 kJ.

16.

1 point

Mechanical refrigeration is a/an:

Heat withdrawal process.

Compression process.

Evaporation process.

Cooling process.

Heat transfer process.

17.

1 point

Evaporation coils

should contain the entire charge of refrigerant.

are used to circulate refrigerant.

are where the heat transfer occurs.

are located on the back of a domestic refrigerator.

are found only in an ammonia system.

18.

1 point

In an atmospheric condenser, the condensing medium is:

Water.

Air.

Refrigerant vapor.

Brine.

Air and/or water.

19.

1 point

The difference in cooling water inlet and cooling water outlet temperature should be around

22 degrees Celsius.

13 degrees Celsius.

18 degrees Celsius.

5 degrees Celsius.

10 degrees Celsius.

20.

1 point

Where does the refrigerant change from a liquid to a gas?

At the compressor discharge

In the condenser

In the receiver

In the evaporator