Hyperbolic Radio Systems – 1 MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Hyperbolic Radio Systems – 1″.

1. Which one of the following is not a hyperbolic radio system?
a) Loran-C
b) Omega
c) Chayka
d) VOR

2. What does Omega and Decca have in common?
a) Both measure the phase difference
b) Both measure the time difference
c) Both measure the power difference
d) Both operate in the same frequency range

3. Hyperbolic navigational systems are called so because of their hyperbolic lines of position.
a) True
b) False

4. Loran-C is a line of sight navigational system.
a) True
b) False

5. What is the minimum number of transmitter stations required for a Loran system?
a) 3
b) 2
c) 1
d) 5

6. What is the pulse frequency used in Loran?
a) 120MHz
b) 150MHz
c) 100kHz
d) 1000MHz

7. Which of the following is not true with respect to Loran-C?
a) Loran stands for Long range navigation
b) Uses ground waves
c) Uses pulse techniques
d) Subjected to site errors

8. Which technique, in Loran, allows the use of single transmitter station in two chains?
a) Blinking
b) Blanking
c) Pulsing
d) Continuous wave transmission

9. _____ is defined as the portion of pules after 65μsec?
a) Pulse trailing edge
b) Final pulse
c) Decay zone
d) Null

10. What is the process of ensuring that the receiver works on ground waves?
a) PGTR identification
b) ECD
c) HCG

11. Which of the following is false with respect to Omega systems?
a) Four common transmitted signal frequencies
b) One unique frequency for each station
c) 0.2 sec separation between each of eight transmissions
d) Constant length transmission periods

12. The short term propagation effects caused by local weather changes are called as ______________
a) Seasonal
b) Temporal
c) Diurnal
d) Noise

13. Which of the following is not a function of the monitoring facility in Omega systems?
a) Monitor performance
b) Acts as relays
c) Provide data to phase synchronize the stations
d) Detect solar terrestrial events

14. Which of the following techniques reduces the diurnal variation but does little effect on the phase behaviour of signal of equal path length over different environments?
a) Composite Omega
b) Propagation corrections
c) PPC
d) Subtracting the signal phases at two of the frequencies

15. What is the region in which Omega signals are confined according to VLF wave guide model known as?
a) Earth-Atmosphere wave guide
b) Sea-Ionosphere wave guide
c) Earth-Sea wave guide
d) Earth-Ionosphere wave guide

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