The EPC has to detect if the interrogator-receiver has been locked on, by reflected pulse-pairs.

 

4                   

The EPC has to protect the transponder-receiver against reflected pulse-pairs.

 

Вопрос 130

With respect to the principle of distance measurement using DME can be stated that:

 

1) the time between the pulse pairs of the interrogation signal is at random.

 

2) in the search mode more pulse pairs per second are transmitted than in the tracking mode.

 

3) the DME station always has a transponder delay of 50 milliseconds.

 

4) the interrogation signal is transmitted on the same frequency as the reply signal.

 

Which of the above given statements are correct?

 

 

Ответы

1                   

2, 3,4

 

2                   

1, 2, 3,4

 

3              

1,2

 

4                   

3,4

 

Вопрос 131

DME accuracy is:

 

 

Ответы

1                   

increases with increase of altitude.

 

2                   

is approximately ± 0,5 NM.

 

3              

Decreases with increase of range.

 

4                   

is approximately ± 2 NM.

 

Вопрос 132

A VOR and DME are co-located. You want to identify the DME by listening to the Morse code identifier. Having

 

heard the same Morse identifier 4 times in 30 seconds the:

 

 

Ответы

1                   

DME Morse ident was not transmitted, the distance information is sufficient proof of correct operation.

 

2                   

DME Morse ident is the one with the lower pitch that was broadcast several times.

 

3              

DME Morse ident is the one with the higher pitch that was broadcast only once.

 

4                   

VOR and DME Morse idents were the same and broadcast with the same pitch.

 

 

Вопрос 133

For a conventional DME facility Beacon Saturation will occur whenever the number of simultaneous interrogations

 

exceeds:

 

 

Ответы

1              

100

 

2                   

80

 

3                   

60

 

4                   

200

 

Вопрос 134

DME operating principle is the measurement of the:

 

 

Ответы

1                   

frequency change between the emitted wave and reflected wave.

 

2                   

phase difference between emitted wave and reflected wave.

 

3              

Time between the transmission and reception of radio pulses.

 

4                   

frequency of the reflected wave.

 

 

Вопрос 135

Which one of the following statements is true regarding the DME system?

 

 

Ответы

1                   

DME operates in the VHF frequency band.

 

2              

The transponder reply carrier frequency differs by 63 MHz from that of the interrogation signal.

 

3                   

The DME measures the phase difference between the reference and variable phase signals to calculate the distance.

 

4                   

When passing overhead the DME station the DME will indicate 0.

 

Вопрос 136

The Distance Measuring Equipment (DME) uses the following wavelengths:

 

 

Ответы

1              

Decimetric

 

2                   

hectometric

 

3                   

metric

 

4                   

centimetric

 

 

Вопрос 137

Which of the following systems provides distance information?

 

 

Ответы

1                   

VOR

 

2              

DME

 

3                   

ADF

 

4                   

VDF

 

 

Вопрос 138

Why can DME stations only send out distance information to approximately 100 aircraft at a time?

 

 

Ответы

1                   

Aircraft are sending out 12 ppps and a DME station is only able to process around 1200 ppps.

 

2                   

A DME ground station can only monitor 100 aircraft at a time.

 

3              

A DME ground station is only able to process 2700 ppps.

 

4                   

A DME ground station is only able to process 100 ppps.

 

Вопрос 139

In which situation will speed indications on an airborne Distance Measuring Equipment (DME) most closely

 

represent the groundspeed of an aircraft flying at FL400?

 

 

Ответы

1              

When tracking directly towards the station at a range of 100 NM or more.

 

2                   

When tracking directly away from the station at a range of 10 NM.

 

3                   

When passing abeam the station and within 5 NM of it.

 

4                   

When overhead the station, with no change of heading at transit.

 

Вопрос 140

Correct statement about the interrogation by the DME interrogator is

 

 

Ответы

1                   

The interrogation starts when the interrogator has been warmed up sufficiently, whether pulse-pairs are received or not.

2              

The interrogation does not start before pulse-pairs of the tuned DME station are received.

 

3                   

The interrogation starts directly after the correct DME frequency has been selected on the frequency- selecting-panel by the pilot.

 

4                   

The interrogation can only take place if the Echo Protection Circuit has been locked.

 

Вопрос 141

DME transponder becomes saturated it will:

 

 

Ответы

1                   

give preference to the nearest 100 aircraft.

 

2                   

give preference to the first 100 aircraft which interrogated it.

 

3                   

give preference to the furthest aircraft up to a maximum of 70.

 

4              

Give preference to the aircraft with the strongest transmissions.

 

 

Вопрос 142

The DME line of position is a circle with radius at:

 

 

Ответы

1              

The ground distance and centre the DME station.

 

2                   

the ground distance and centre the aircraft.

 

3                   

the slant range and centre the aircraft.

 

4                   

the slant range and centre the DME station.

 

Вопрос 143

Why aircraft DME receiver cannot lock on to interrogation signals reflected from the ground?:

 

 

Ответы

1