OGRAD 09.02 - LORAN-C ( ATPL Only)

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Q1. When using hyperbolic navigation systems to provide lines of position, the basic measurements are

Timing

Angular displacement

Of actual speed at short intervals of time

Speed changes

Timing

Q2. 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 widest along the perpendicular to the base-line, equidistant from the master and slave stations

Is most narrow along the base-line extension

Is most narrow along the base-line

Q3. In a hyperbolic navigation system the area of highest accuracy of a single line of position is

On the perpendicular to the base-line

Along the base-line

At equidistance from the two ground stations

Along the base-line extension

Along the base-line

Q4. When data are published for a hyperbolic navigation system, they are valid

For all users at ground speeds up to 500 Kt

For all propagation situations, also when night effect is dominant

For users at sea level

For a period of up to 5 years

For users at sea level

Q5. In a LORAN C system you will detect a constant time difference when moving

Along any hyperbola

All 4 answers are correct

Along the Base line extension

Along the Base line

Along any hyperbola

Q6. Within the area of coverage of a hyperbolic navigation system, the highest accuracy of a two-position line fix will be achieved when

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

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

Q7. Which of the following correctly gives the principle of operation of the Loran C navigation system?

Differential range by phase comparison

Differential range by pulse technique

Phase comparison between synchronised transmissions

Frequency shift between synchronised transmissions

Differential range by pulse technique

Q8. 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 identification signal they transmit

The delay in time introduced at each slave station

The direction of the signal from the slave stations

The carrier frequency used by each slave station

The delay in time introduced at each slave station

Q9. Which of the following frequency-bands is used by the Loran C navigation system?

10.2-13.6 kHz

978-1213 MHz

1750-1950 kHz

90-110 kHz

Q10. The base-line between the LORAN C master and slave station is typically

1200-1500 NM

600-1000 NM

200-400 NM

50-150 NM

600-1000 NM

Q11. Which of the following statements concerning LORAN-C is correct?

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

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 range measurement by phase comparison

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

Q12. LORAN C use a radio frequency of

Around 1000 MHz

Around 100 kHz

Around 260 kHz

Around 30 kHz

Around 100 kHz

Q13. In which navigation system does the master station transmit a continuous string of pulses on a frequency close to 100 kHz?

Loran C

GPS

Decca

Doppler

Loran C

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

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

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

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

Also have facilities to receive NDBs

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

Q15. Loran C coverage is:

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

confined to certain limited areas of the world

global

unrestricted between latitudes 70°N and 70°S

confined to certain limited areas of the world

Q16. To produce a two-position line fix, the ground elements of a hyperbolic navigation system must consist of at least

3 master stations and 3 slave stations

1 master and 1 slave station

2 master stations and 3 slave stations

2 slave stations and a master station serving them both

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