Modes S System MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Modes S System”.

1. What is the frequency of interrogation pulse in secondary radar?
a) 1020 MHz
b) 1300 MHz
c) 1030 MHz
d) 1500 MHz

2. Which mode is used for selective calling?
a) Mode A
b) Mode B
c) Mode C
d) Mode S

3. How does mode S system differ from mode A and C?
a) Extension of secondary radar
b) Uses pulse technology
c) More data can be transferred
d) One way travel of radio signal

4. What are the numbers of non-selective interrogations in mode S system?
a) 5
b) 6
c) 7
d) 8

5. The error caused by two aircraft flying close to each other replying to the same interrogation pulse is called ______
a) Garble
b) Fruit
c) Noise
d) Interference

6. A mode S transponder is silent when it is not interrogated.
a) True
b) False

7. How does mode S identify each aircraft?
a) Unique code for each transponder
b) Lapsed time
c) RCS
d) Directly talking to the pilot

8. Transmission of modes reply at regular interval to aid TACS is called ________
a) Garble
b) Squitter
c) Fruit
d) Pulsed Radar

9. Both ATCRBS and mode S have the same range.
a) True
b) False

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