vapour compression system 4

1.

1 point

An indirect refrigeration system uses

a flooded evaporator.

a separate cold storage room.

a brine solution.

a remote evaporator.

2.

1 point

When the refrigerant passes through the expansion valve it is

mostly a liquid and part gas.

a subcooled liquid.

a superheated liquid.

mostly a gas and part liquid.

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

An example of a physical property of a refrigerant is

density

specific volume.

miscibility.

latent heat capacity.

5.

1 point

In an atmospheric condenser, the condensing medium is:

Air

Brine

Refrigerant vapor.

Water

Air and/or water

6.

1 point

Which of the following are classified as Group 1 refrigerants?

Ammonia
Carbon dioxide
Water
Freon 12
Sulphur dioxide

1 and 5 are correct

2, 3 and 4 are correct

2 and 3 are correct

1, 2, 3, 4 and 5 are correct

2 and 4 are correct

7.

1 point

In an atmospheric condenser

Water circulates between the outside and inside tubes

Air is blown throughout the tubes

Water flows through the inner tubes

Water trickles over the outside of the tubes

8.

1 point

What is a disadvantage of carbon dioxide as a refrigerant?

Corrosive

Flammable

Poisonous

Expensive

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

In a refrigeration process, the refrigerant gas is changed to a liquid in the

evaporator.

compressor

receiver

condenser

11.

1 point

The lower a refrigerant's boiling point at atmospheric pressure, the:

More expensive it is.

More heat it will absorb.

Greater will be its condensing pressure.

Greater will be its density.

12.

1 point

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

sensible heat

radiant heat

latent heat

specific heat

13.

1 point

One tonne of refrigeration is equal to:

one tonne of melted ice.

1103 kJ/min.

335000 kJ/min.

233 kJ/min.

335 kJ/min.

14.

1 point

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

In the condenser

At the compressor discharge

In the evaporator

In the receiver

15.

1 point

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

33500 kJ

1103 kJ

2330 kJ.

233 kJ.

3350 kJ.

16.

1 point

Mechanical refrigeration is a/an:

Evaporation process.

Heat withdrawal process.

Heat transfer process

Cooling process.

Compression process.

17.

1 point

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

The end

The top

The bottom

The side

18.

1 point

In a double pipe condenser, the water flows

through the space between the tubes.

through the inner tube.

over the outer tube.

around the tubes.

between tube sections

19.

1 point

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

18 degrees Celsius

5 degrees Celsius.

22 degrees Celsius

13 degrees Celsius.

10 degrees Celsius.

20.

1 point

The King Valve is located

between the receiver and the evaporator.

between the condenser and the receiver.

at the highest point in the system for purging

on the condenser cooling water line.

between the evaporator and the compressor.