Cabin Atmosphere Control Systems Ch. 14 Sec. C

Question 1

1. The most common type of heater for small single-engine aircraft is the __
   heater.

Answer 1

Exhaust Shroud

Question 2

2. Light and medium-twin engine aircraft are often heated with __ heaters.

Answer 2

Combustion

Question 3

3. The thermostat of a combustion heater controls the __ ( fuel valve or ignition).

Answer 3

Fuel Valve

Question 4

4. The ventilating air pressure inside the combustion heater is ___ (higher or lower) than the pressure of the combustion air.

Answer 4

Higher

Question 5

5. When the temperature is reached for which the duct limit switch of a combustion heater is set the, ___ (fuel or ignition) to the heater is shut off.

Answer 5

Fuel

Question 6

6. Which of these controls for a combustion heater is not normally accessible in flight?
   (a, b, or c)
   a. Heater master switch.
   b. Cabin thermostat.
   c. Overheat switch,

Answer 6

c

Question 7

7. Two methods of removing heat from the air in an air cycle air conditioning system are:
   A.
   B.

Answer 7

Ram air heat exchangers
Expanding Air Across a Turbine

Question 8

8. The water separator in an air cycle air conditioning system removes the water from the air ___ (before or after) it passes through the air cycle machine.

Answer 8

After

Question 9

9. Two types of air conditioning system for lowering the temperature of the air in an aircraft cabin are:
   a.
   b.

Answer 9

Air-cycle Machines
Vapor-cycle systems

Question 10

10. Heat that is added to a liquid that causes a change in its state without changing its temperature is called __ heat

Answer 10

Latent

Question 11

11. The two components in a vapor cycle air conditioning system that divide the system into the high and low side are the:
    a.
    b.

Answer 11

Compressor
Expansion Valve

Question 12

12. The component in a vapor cycle air conditioning system that acts as the reservoir for the refrigerant is the __

Answer 12

Receiver-dryer

Question 13

13. The substance in a vapor cycle air conditioning system that is found in the receiver-dryer and used to remove moisture from the refrigerant is known as __.

Answer 13

Desiccant

Question 14

14. The component in a vapor cycle air conditioning system in which heat from the cabin is absorbed into the refrigerant is the __

Answer 14

Evaporator

Question 15

15. The refrigerant most generally used in aircraft air-conditioning systems is __
    R-22

Answer 15

R-12

Question 16

16. The thermal expansion valve of a vapor cycle air conditioning system is the __for the system.

Answer 16

Control

Question 17

17. The component in a vapor cycle air conditioning system in which the heat in the refrigerant is given up to device the outside air is the

Answer 17

Condenser

Question 18

18. Two types of leak detectors that are suitable for detecting a refrigerant leak in an aircraft air conditioning system are:
    a
    b

Answer 18

Soapy Water
Electronic Oscillator

Question 19

19. If bubbles are visible in the refrigerant in the system. there is not enough

Answer 19

Sight Glass

Question 20

20. Any time a vapor cycle air conditioning system has been opened, it must be before it is recharged.

Answer 20

Purged

Question 21

21. Refrigerant should normally be put into the low side of an air conditioning system in its (liquid or vapor) state.

Answer 21

Vapor