OGRAD 09.02 - LORAN-C ( ATPL Only)

Results

Q1. Within the area of coverage of a hyperbolic navigation system, the highest accuracy of a two-position line fix will be achieved when

The Master and the slave station are both located on the same base-line

The 2 position lines intersect at right angles, and the distances to the ground stations are not too long

The 2 position lines are parallel and the distances to the ground are within the published area of coverage

The 2 position lines intersect on the base-line of one of them

The 2 position lines intersect at right angles, and the distances to the ground stations are not too long

Q2. Which of the following frequency-bands is used by the Loran C navigation system?

90-110 kHz

10.2-13.6 kHz

978-1213 MHz

1750-1950 kHz

90-110 kHz

Q3. The base-line between the LORAN C master and slave station is typically

600-1000 NM

50-150 NM

1200-1500 NM

200-400 NM

600-1000 NM

Q4. LORAN C use a radio frequency of

Around 30 kHz

Around 100 kHz

Around 260 kHz

Around 1000 MHz

Around 100 kHz

Q5. Which of the following correctly gives the principle of operation of the Loran C navigation system?

Frequency shift between synchronised transmissions

Differential range by pulse technique

Differential range by phase comparison

Phase comparison between synchronised transmissions

Differential range by pulse technique

Q6. In a LORAN C system you will detect a constant time difference when moving

Along any hyperbola

Along the Base line

All 4 answers are correct

Along the Base line extension

Along any hyperbola

Q7. In a hyperbolic navigation system the area of highest accuracy of a single line of position is

Along the base-line extension

Along the base-line

At equidistance from the two ground stations

On the perpendicular to the base-line

Along the base-line

Q8. In which navigation system does the master station transmit a continuous string of pulses on a frequency close to 100 kHz?

Loran C

Decca

Doppler

GPS

Loran C

Q9. When using hyperbolic navigation systems to provide lines of position, the basic measurements are

Angular displacement

Speed changes

Timing

Of actual speed at short intervals of time

Timing

Q10. Which of the following statements concerning LORAN-C is correct?

It is a hyperbolic navigation system that works on the principle of range measurement by phase comparison

It is a navigation system based on secondary radar principles; position lines are obtained in sequence from up to eight ground stations

It is a hyperbolic navigation system that works on the principle of differential range by pulse technique

It is a navigation system based on simultaneous ranges being received from a minimum of four ground stations

It is a hyperbolic navigation system that works on the principle of differential range by pulse technique

Q11. Loran C coverage is:

global

unrestricted over the oceans and adjacent coastlines but limited over the major continental land masses

confined to certain limited areas of the world

unrestricted between latitudes 70°N and 70°S

confined to certain limited areas of the world

Q12. To produce a two-position line fix, the ground elements of a hyperbolic navigation system must consist of at least

2 master stations and 3 slave stations

3 master stations and 3 slave stations

1 master and 1 slave station

2 slave stations and a master station serving them both

Q13. In the LORAN C system a single master station may trigger two or more slave stations. The pulses transmitted from each of the slave stations may be identified by

The carrier frequency used by each slave station

The identification signal they transmit

The delay in time introduced at each slave station

The direction of the signal from the slave stations

The delay in time introduced at each slave station

Q14. All modern LORAN C receivers intended for use in aircraft

Have a built-in navigation computer, programmed for great circle navigation

Also have facilities to receive NDBs

Presents the aircraft position as bearing and distance from the master or slave stations

Call for the user to identify the received Master and Slave station before any positional information is displayed

Have a built-in navigation computer, programmed for great circle navigation

Q15. In a LORAN C system the spacing between lines of position having a 10 msec time difference

Is most narrow along the perpendicular to the base-line

Is most narrow along the base-line

Is most narrow along the base-line extension

Is widest along the perpendicular to the base-line, equidistant from the master and slave stations

Is most narrow along the base-line

Q16. When data are published for a hyperbolic navigation system, they are valid

For a period of up to 5 years

For all propagation situations, also when night effect is dominant

For all users at ground speeds up to 500 Kt

For users at sea level

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