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DGCA Air Navigation: Loran C Questions

11 exam-style Loran C questions for the DGCA Air Navigationpaper (CPL & ATPL). The first 11 are free below with answers and explanations — sign up free to practise all of them with progress tracking.

  1. Q1

    The principle of operation of Loran C is:

    • Atiming the interval transmitted and received pulses.
    • Bdifferential range by frequency comparison.
    • Cdifferential range by pulse transmissions.
    • Ddifferential range by phase comparison.
    Show answer

    Correct answer: C. differential range by pulse transmissions.

    This Explanation is Coming Soon

  2. Q2

    The frequency and waveband of LORAN C are:

    • A100 kHz, hectometric
    • B100 MHz, kilometric
    • C100 MHz, hectometric
    • D100 kHz, kilometric
    Show answer

    Correct answer: D. 100 kHz, kilometric

    This Explanation is Coming Soon

  3. Q3

    The coverage of LORAN C is:

    • ASpecified areas only
    • BNorthern hemisphere only
    • COceanic areas
    • DNorthern hemisphere oceanic areas
    Show answer

    Correct answer: A. Specified areas only

    This Explanation is Coming Soon

  4. Q4

    The principle of operation of Loran C is:

    • Atiming the interval between transmitted and received pulses.
    • Bdifferential range by frequency comparison.
    • Cdifferential range by pulse transmissions.
    • Ddifferential range by phase comparison.
    Show answer

    Correct answer: C. differential range by pulse transmissions.

    This Explanation is Coming Soon

  5. Q5

    The frequency and waveband of LORAN C are:

    • A100 kHz, hectometric
    • B100 MHz, kilometric
    • C100 MHz, hectometric
    • D100 kHz, kilometric
    Show answer

    Correct answer: D. 100 kHz, kilometric

    This Explanation is Coming Soon

  6. Q6

    The coverage of LORAN C is:

    • ASpecified areas only
    • BNorthern hemisphere only
    • COceanic areas
    • DNorthern hemisphere oceanic areas
    Show answer

    Correct answer: A. Specified areas only

    This Explanation is Coming Soon

  7. Q7

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

    • A It is a hyperbolic navigation system that works on the principle of differential range by pulse technique
    • BIt is a navigation system based on secondary radar principles, position lines are obtained in sequence from up to eight ground stations
    • CIt is a hyperbolic navigation system that works on the principle of range measurement by phase comparison
    • DIt is a navigation system based on simultaneous ranges being received from a minimum of four ground stations
    Show answer

    Correct answer: A. It is a hyperbolic navigation system that works on the principle of differential range by pulse technique

    Loran C is a hyperbolic navigation system that works on differential range, comparing the arrival times of pulses from a master and its secondary stations to define position lines. It is not a secondary-radar or simultaneous-range system.

  8. Q8

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

    • A Loran C
    • BGPS
    • CDecca
    • DDoppler
    Show answer

    Correct answer: A. Loran C

    Loran C uses a master station transmitting a continuous string of pulses on a frequency close to 100 kHz, with secondaries synchronised to it. Decca used continuous waves and GPS operates at microwave frequencies.

  9. Q9

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

    • ADifferential range by pulse technique
    • B Frequency shift between synchronised transmissions
    • CDifferential range by phase comparison
    • D Phase comparison between synchronised transmissions
    Show answer

    Correct answer: A. Differential range by pulse technique

    Loran C determines position by differential range using the pulse technique, measuring the time difference between pulses from master and secondary stations to give hyperbolic position lines. It is not a pure phase-comparison or frequency-shift system.

  10. Q10

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

    • A 90 - 110 kHz
    • B1750 - 1950 kHz
    • C10.2 - 13.6 kHz
    • D978 - 1213 MHz
    Show answer

    Correct answer: A. 90 - 110 kHz

    Loran C operates in the low-frequency band of about 90 to 110 kHz, centred on 100 kHz. These long waves give the ground-wave coverage that the system depends on.

  11. Q11

    Loran C coverage is:

    • A confined to certain limited areas of the world
    • B global
    • C unrestricted between latitudes 70°N and 70°S
    • Dunrestricted over the oceans and adjacent coastlines but limited over the major continental land masses
    Show answer

    Correct answer: A. confined to certain limited areas of the world

    Loran C coverage is confined to certain limited areas of the world served by chains of ground stations, so it is not a global system. Coverage exists only where a master and its secondaries provide overlapping signals.

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