Primary and Secondary Radar MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Primary and Secondary Radar”.

1. Which of the following is false with respect to primary radar?
a) Friend or foe identification is possible
b) Height of the aircraft cannot be determined
c) Has a wide range
d) Requires high power

2. What type of radar is the primary radar?
a) Pulse
b) Continuous wave
c) Low frequency
d) Analog

3. Which of the following cannot be measured in primary radar?
a) Height of the aircraft
b) Speed of the aircraft
c) Direction of the aircraft
d) Position of the aircraft

4. What is the full form of RADAR?
a) Radio and ranging
b) Radio range
c) Range detection radio
d) Radio Detection and Ranging

5. The transmitted and received power is the same in a primary radar.
a) True
b) False

6. Which of the following is false with respect to secondary radar?
a) Requires more power than primary radar
b) Needs a transponder device on the aircraft
c) IFF
d) Better range

7. How well a target backscatters radar depends on ________
a) The objects RCS
b) Power of radar
c) Speed of the object
d) Heat signature of the object

8. What is one of the main objectives of a military aircraft design?
a) High heat signature
b) Low RCS
c) High RCS
d) Highly stable configuration

9. The ability of the antenna to turn radiated energy into conducted energy is called ____________
a) Return ratio
b) Power ratio
c) Capture area
d) RCS

10. Secondary radar can identify an aircraft flying in its range.
a) True
b) False

11. Which mode of the secondary radar gives only altitude?
a) Mode A
b) Mode B
c) Mode C
d) Mode S

12. What is the reflected pulse in primary radar called?
a) Reply
b) Return
c) Echo
d) Radio reply

13. The strength of a secondary radar varies inversely with distance to the ______ power.
a) Second
b) Fourth
c) Eighth
d) Zeroth

14. The undesirable responses from buildings and clouds for the radar pulse are called as __________
a) Noise
b) Disturbance
c) Clutter
d) Radio error

15. What is the time separation for P1 and P3 for mode A secondary radar?
a) 8 μs
b) 21 μs
c) 6 μs
d) 4 μs

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