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ATPL 21 AIRCRAFT GENERAL KNOWLEDGE – AIRFRAME AND SYSTEMS |
| 21.09 PISTON ENGINES |
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1
The function of an air cycle machine is to :
Cool the bleed air. of the bleed air. |
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2
The advantages of thermal anti-icing are : 1. simple and reliable system 2. profiles maintained 3. greater efficiency than that of an electrical resistor 4. direct use of the hot air from the jet engine without substantial reduction in engine thrust the combination of correct statements is:
1,2 |
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3
Conditioned air is air that has :
Been controlled in respect of temperature |
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4
In the pneumatic supply system of a modern transport aircraft, the air pressure is regulated. this pressure regulation occurs just before the manifold by the :
Low pressure bleed air valve |
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5
In a bootstrap cooling system the supply air is first : exchanger.
Compressed, passed through a secondary heat exchanger, and then across an expansion turbine. |
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6
The term "bootstrap", when used to identify a cabin air conditioning and pressurisation system, refers to the :
Cold air unit (air cycle machine) arrangement. |
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7
In a bootstrap system, the purpose of the heat exchangers is to:
Cool bleed air and compressor air from the turbo refrigerator. |
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8
In an aircraft air conditioning system the air cannot be treated for:
Humidity. |
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9
The turbine in a cold air unit (air cycle machine):
Drives the compressor in the unit, creating a temperature drop in the conditioning air. |
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10
Environmental system: in the air refrigeration unit, the water separation unit is placed:
After the cooling turbine. |
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11
The air-conditioning pack of a present-day aircraft consists of several components: these include two heat exchangers. the primary exchanger (p) and the secondary exchanger (s). the functions of these heat exchangers are as follows:
P: precools the engine bleed air s: reduces the temperature of the air from the primary exchanger or from the pack"s compressor. |
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12
Conditioned air is air that has:
Been controled in respect of temperature and pressure. |
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13
The term "cabin pressure" applies when an aeroplane:
Has the means to maintain the cabin pressure at a higher level than the ambient pressure. |
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14
When air is compressed for pressurization purposes, the percentage oxygen content is:
Unaffected. |
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15
The term "bootstrap", when used to identify a cabin air conditioning and pressurisation system, refers to the:
Cold air unit (air cycle machine) arrangement. |
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16
In a bootstrap cooling system the supply air is first:
Compressed, then goes through a heat exchanger, and across an expansion turbine. |
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17
Engine bleed air used for air conditioning and pressurization in turbo- jet aeroplanes is usually taken from the:
Compressor section. |
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18
In large modern aircraft, in the air conditioning system, reduction of air temperature and pressure is achieved by:
An expansion turbine. |
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19
In a "bootstrap" cooling system, the charge air is first compressed in the cold air unit to:
Ensure an adequate pressure and temperature drop across the cooling turbine. |
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20
A turbo-fan cold air unit will:
Cause a pressure drop as well as an associated temperature drop in the charge air. |
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21
The cabin heating supply in a heavy jet transport aircraft is obtained from :
Hot air coming from the engine"s compressors. |
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22
The pack cooling fan provides:
Cooling air to the primary and secondary heat exchanger during slow flight and ground operation. |
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23
In flight, the most commonly used anti- icing method for the wings of modern commercial aircraft fitted with turbo-jet units is:
Thermal (use of hot air). |
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24
Concerning electrically powered ice protection devices, the only true statement is: windshield...
On modern aeroplanes, electrically powered thermal devices are used to prevent icing on small surfaces (pitot- static, windshield...). |
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25
The elements specifically protected against icing on transport aircraft are: 1) engine air intake and pod. 2) front glass shield. 3) radome. 4) pitot tubes and waste water exhaust masts. 5) leading edge of wing. 6) cabin windows. 7) trailing edge of wings. 8) electronic equipment compartment. the combination regrouping all the correct statements is :
1, 2, 4, 5 |
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26
In a cabin air conditioning system, equipped with a bootstrap, the mass air flow is routed via the:
Secondary heat exchanger outlet to the turbine inlet of the cold air unit. |
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27
What is the purpose of the pack cooling fans in the air conditioning system?
Supplying the heat exchangers with cooling air during slow flights and ground operation. |
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28
The cabin air for modern airplanes is usually supplied by:
Main engine compressors. |
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29
Cabin air for modern aircraft is usually taken from:
The low pressure compressor and from |
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30
Main cabin temperature is:
Controlled automatically, or by flight crew selection. |
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31
In the air cycle system the air is cooled down by expansion:
In the turbine. |
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32
The pneumatic system accumulator is useful :
To eliminate the fluid pressure variations. |
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33
The ice protection system currently used for the most modern jet aeroplanes is the
Hot air system. expandable boots. |
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34
During flight, the wing anti-ice system has to protect
Leading edges, slats and the leading edge flaps. |
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35
In jet aeroplanes the "thermal anti-ice system" is primary supplied by
Bleed air from the engines. |
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36
The anti-ice or de-icing system which is mostly used for the wings of modern turboprop aeroplanes is :
Pneumatic boots. |
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37
The ice protection for propellers of modern turboprop aeroplanes works
Electrically. |
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38
The water separator of an air-conditioning unit is located at the cooling unit :
Outlet and uses a centrifugal process. |