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ATPL 22 AIRCRAFT GENERAL KNOWLEDGE – INSTRUMENTATION |
| 22.03 EARTH MAGNETIC FIELD |
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1
The ground proximity w arning system (gpws) is a system working according to a height span ranging from :
50 ft to 2 500 ft |
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2
The signal supplied by a transmitter fitted with a 3-phase ac generator, connected to rpm indicator, is :
A three-phase voltage, the frequency of which varies with the rpm. the indicator is provided with a motor which drives a magnetic tachometer |
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3
The signal supplied by a transmitter fitted with a magnetic sensor, connected to an rpm indicator is :
An ac voltage, the frequency of which varies with the rpm. the indicator converts the signal into square pulses which are then counted |
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4
The transmitter of rpm indicator may consist of : 1- a magnetic sensor supplying an induced ac voltage 2- a dc generator supplying a dc voltage 3- a single-phase ac generator supplying an ac voltage 4- a three-phase ac generator supplying a three-phase voltage the combination of correct statements is :
1,2,3,4 |
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5
The ground proximity w arning system (gpws) generates the following sound signal or signals when the aircraft is sinking after a take-off or a go- around :
Don"t sink repetitive only |
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6
The operation of the gpws (ground proximity warning system) is governed by laws taking the aircraft height into account as well as : 1- the descent rate 2- the climb rate 3- the aircraft configuration 4- the selected engine rpm the combination of correct statements is :
1,3 |
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7
The gpws calculator receives the following signals : 1 - vertical speed 2 - radio altimeter height 3 - pressure altitude 4 - glidepath deviation 5 - gear and flaps position 6 - angle of attack the combination regrouping all the correct statements is :
1,2,4,5 |
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8
A ground proximity warning system (gpws), when mandatorily installed on board an aircraft, must in all cases generate :
At least one sound alarm to which a visual alarm can be added |
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9
The gpws calculator is able to operate in the following modes : 1- excessive descent rate 2- excessive rate of terrain closure 3- excessive angle of attack 4- too high descent attitude 5- loss of altitude after take-off 6- abnormal gear/flaps configuration 7- excessive glidepath deviation the combination regrouping all the correct statements is:
1,2,5,6,7 |
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10
The fields affecting a magnetic compass originate from: 1. magnetic masses 2. ferrous metal masses 3. non ferrous metal masses 4. electrical currents the combination of correct statements is:
1, 2, 4 |
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11
A synchroscope is used on aircraft to:
Set several engines to the same speed. |
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12
The disadvantage of an electronic rpm indicator is the :
Necessity of providing a power supply source. |
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13
The rpm indicator tachometer) of a piston engine can include a small red arc within the arc normally used (green arc) in the rpm range corresponding to this small red arc the :
Propoller generates possible in continuous mode |
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14
In the northern hemisphere, during deceleration following a landing in an easterly direction, the magnetic compass will indicate :
An apparent north. |
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15
During deceleration following a landing in a southerly direction, the magnetic compass will indicate :
No apparent turn. |
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16
In the southern hemisphere, during deceleration following a landing in a westerly direction, the magnetic compass will indicate :
An apparent turn to the north. |
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17
A pilot wishes to turn left on to a northerly heading with 10§ba nk at a latitude of 50§north. using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of :
030ô› |
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18
The magnetic heading can be derived from the true heading by means of a :
Map showing the isogonal lines |
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19
The compass heading can be derived from the magnetic heading by reference to a:
Compass swinging curve |
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20
During deceleration following a landing in northerly direction, the magnetic compass will indicate :
No apparent turn. |
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21
A pilot wishes to turn right on to a northerly heading with 20§ba nk at a latitude of 40§north. using a direct reading compass, in order to achieve this he must stop the turn on to an approximate heading of :
330ô› |
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22
A pilot wishes to turn left on to a southerly heading with 20§ba nk at a latitude of 20§north. using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of :
160ô› |
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23
A pilot wishes to turn right on to a southerly heading with 20§ba nk at a latitude of 20§north. using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of :
210ô› |
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24
The quadrantal deviation of the magnetic compass is due to the action of :
The soft iron pieces by the mild geomagnetic field |
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25
The quadrantal deviation of a magnetic compass is corrected by using :
Soft iron pieces |
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26
In the southern hemisphere, during deceleration following a landing in an easterly direction, the magnetic compass will indicate :
An apparent turn to the north. |
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27
In the northern hemisphere, during deceleration following a landing in a westerly direction, the magnetic compass will indicate :
An apparent turn to the south. |
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28
The purpose of compass swinging is to determine the deviation of a magnetic compass :
On any heading |
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29
Among the errors of a magnetic compass, are errors:
In north seeking, due to bank angle and magnetic heading |
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30
A ground proximity w arning system (gpws) generates automatically a distinct warning to the flight crew with aural and/or light warning signals in the case of: 1- an excessive rate of descent with respect to terrain 2- a dangerous proximity to the ground 3- a loss of altitude following take-off or go- around 4- an abnormal flight attitude 5- an abnormal landing configuration 6- an abnormal deviation below ils glide slope the combination regrouping all the correct statements is:
1, 2, 3, 5 and 6. |
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31
If the gpws (ground proximity warning system) activates, and alerts the pilot with an aural warning sink" (twice times), it is because :
During take-off or missed approach manoeuvre, the aircraft has started to loose selected. |
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32
The disadvantages of a single-phase a.c. generator tachometer are: 1- the presence of spurious signals due to a d.c. generator commutator 2- the importance of line resistance on the information value 3- the influence of temperature on the tachometer information the combination regrouping all the correct statements is:
2. |
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33
The advantages of single-phase a.c. generator tachometer are: 1- the suppression of spurious signals due to a d.c. generator commutator 2- the importance of line resistance on the information value 3- the independence of the information in relation to the airborne electrical power supply 4- the ease of transmission of the information the combination regrouping all the correct statements is:
1, 3. |
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34
The advantages of a d.c. generator tachometer are: 1- easy transmission of the information. 2- independence of the information relative to the airborne electrical power supply. 3- freedom from any spurious current due to the commutator. the combination regrouping all the correct statements is:
1, 2. |
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35
The electronic tachometer sensor is composed of:
A notched wheel rotating in front of an electro-magnet. |
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36
The advantages of an electrical induction tachometer are: 1- the display is not sensitive to line resistance 2- the measurement is independent of aircraft power supply 3- the measurement is independent of temperature variations 4- the option to use without restriction several indicators connected in parallel to a single transmitter the combination regrouping all the correct statements is:
1, 2, 4. |
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37
If an aircraft is flying (with flaps and landing gear retracted) in proximity to terrain and its gpws (ground proximity warning system) get activated, because it is detecting that the aeroplane has an excessive rate of descent, the system provides the following aural warning signals :
Sink rate, sink rate followed by "whoop whoop pull up" (twice) |
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38
The gpws (ground proximity warning system) releases a warning in the following cases : 1- excessive rate of descent 2- excessive ground proximity rate 3- loss of altitude after take-off or go-around 4- abnormal gear/flaps configuration 5- excessive deviation under the glidepath 6- abnormal airbrakes configuration the combination regrouping all the correct statements is:
1, 2, 3, 4, 5 |
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39
The red pointer which is normally on the red line on the egt (exhaust gas temperature) indicators:
Moves when the corresponding value is exceeded and remains positioned at maximum has been reached. |
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40
In a steep turn, the northerly turning error on a magnetic compass on the northern hemisphere is:
Equal to 180§on a 090§heading in a right turn. |
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41
The purpose of a compass swing is to attempt to coincide the indications of:
Compass north and magnetic north. |
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42
The operating principle of the "induction" type of tachometer is to measure the: field.
Rotation speed of an asynchronous motor energized by an alternator. |
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43
The operating principle of an "electronic" tachometer is to measure the: field.
Frequency of the electric impulse created by a notched wheel rotating in a magnetic |
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44
In a 3-phase synchronous motor type tachometer indicator : 1- the transmitter is a direct current generator 2- the voltage is proportional to the transmitter drive speed 3- the frequency is proportional to the transmitter drive speed 4- the speed indicating element is a galvanometer 5. the speed indicating element is an asynchronous motor driving a magnetic tachometer the combination regrouping all the correct statements is:
3, 5 |
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45
The computers of the electrical flight controls system comply with programs defined by attitude control laws such as : 1- on the longitudinal axis, the law may combine the load factor and the changes in the pitch rate as control data sources 2- the trimming is automatic and ensures neutral stability 3- the protections apply to pitch and bank attitudes depending on the speed 4- these laws do not apply to the whole flight envelope the combination regrouping all the correct statements is:
1, 2, 3 |
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46
Magnetic compass swinging is carried out to reduce as much as possible :
Deviation. |
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47
A flux valve senses the changes in orientation of the horizontal component of the earth"s magnetic field. 1- the flux valve is made of a pair of soft iron bars 2- the primary coils are fed a.c. voltage (usually 487.5 hz) 3- the information can be used by a "flux gate" compass or a directional gyro 4- the flux gate valve casing is dependent on the aircraft three inertial axis 5- the accuracy on the value of the magnetic field indication is less than 0,5% which of the following combinations contains all of the correct statements?
02/03/2005 |
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48
An aircraft takes-off on a runway with an alignment of 045§. the isogonic line on the area chart indicates 0§. the compass deviation is o§. on a take-off with zero wind, the northerly turning error:
Is such that the compass will indicate a value noticeably below 045§. |
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49
When turning onto a northerly heading the rose of a magnetic compass tends to "undershoot." when turning onto a southerly heading it tends to "overshoot": 1)these compass indications are less reliable in the northern hemisphere than in the southern hemisphere. 2)these compass oscillations following a lateral gust are not identical if the aircraft is heading north or south. 3) this behaviour is due to the mechanical construction of the compass. 4) this behaviour is a symptom of a badly swung compass. the correct statements are :
2 and 3. |
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50
The gpws (ground proximity warning system) is active for a height range from:
50 ft to 2 500 ft measured by the radio altimeter. |
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51
On an aeroplane equipped with a constant speed propeller, the rpm indicator enables :
Control of the propeller regulator and the display of propeller rpm. |