A03: Radar Quiz

Q1. Which radar type uses aircraft transponders to get information like identity and altitude?

Monopulse Secondary Surveillance Radar (MSSR)

Surface Movement Radar (SMR)

Primary Surveillance Radar (PSR)

Correct answer is B – Monopulse Secondary Surveillance Radar (MSSR)

Q2. What is the typical frequency range used by DME?

960–1215 MHz

225–400 MHz

118–137 MHz

Correct answer is – 960–1215 MHz

Q3. DME full form is?

Distance measuring equipment

Distance Maintaining Equipment

Digital Measuring Equipment

Correct answer is – Distance measuring equipment

Q4. What does the acronym RHO-THETA represent in navigation?

Speed and altitude

Latitude and longitude

Distance and bearing

Correct answer is – Distance and bearing

Q5. DME provides which type of distance measurement?

Horizontal ground distance

Slant range distance

Bearing distance

Correct answer is – Slant range distance

Q6. Which frequency band is commonly used for long-range air traffic control radar?

C band (4–8 GHz)

Ku band (12–18 GHz)

L band (1–2 GHz)

Correct answer is A – L band (1–2 GHz)

Q7. How long is the fixed beacon delay accounted for in DME calculations?

50 microseconds

25 microseconds

100 microseconds

Correct answer is – 50 microseconds

Q8. What is the main purpose of Radar?

To amplify signals

To send radio messages

To detect objects and measure their distance

Correct answer is B – To detect objects and measure their distance

Q9. What does RADAR stand for?

Radio Distance And Refracting

Radio Detection And Ranging

Radio Direction And Reception

Correct answer is A – Radio Detection And Ranging

Q10. What does SMR (Surface Movement Radar) mainly track?

Vehicles and aircraft on the ground at airports

Airplanes in the sky

Weather systems

Correct answer is B – Vehicles and aircraft on the ground at airports

Q11. Why is slant range usually greater than actual ground distance?

Because it includes altitude as well as horizontal distance

Because radio waves travel slower than sound waves

Because the signal is reflected multiple times

Correct answer is – Because it includes altitude as well as horizontal distance

Q12. How often is the station identification (3-letter Morse code) transmitted by the DME ground station?

Every 60 seconds

Every 10 seconds

Every 30 seconds

Correct answer is – Every 30 seconds

Q13. What type of dose† DME provide to support RNAV systems?

Very accurate slant range data for position fixing

Only bearing information

Only altitude measurement

Correct answer is – Very accurate slant range data for position fixing

Q14. What is the primary function of Surface Movement Radar (SMR) in air traffic control?

Detecting and tracking aircraft and vehicles on airport runways and taxiways

Measuring the speed of airplanes during takeoff

Tracking aircraft in flight at long range

Correct answer is B – Detecting and tracking aircraft and vehicles on airport runways and taxiways

Q15. (DME) operate on?

Primary radar principle

Continuous wave radar principle

Secondary radar principle

Correct answer is – Secondary radar principle

Q16. Which navigation systems is DME commonly used with?

ADF and GPS

VOR and ILS

TACAN only

Correct answer is – VOR and ILS

Q17. Radar works by sending out radio waves and then:

Listening for signals that bounce back from objects

Ignoring the reflected signals

Sending continuous sound waves

Correct answer is B – Listening for signals that bounce back from objects

Q18. How does secondary radar differ from primary radar?

Secondary radar transmits and receives on the same frequency

Secondary radar uses reflected pulses only

Secondary radar receives a reply from the target’s transponder

Correct answer is – Secondary radar receives a reply from the target’s transponder

Q19. Reliable DME signals can be received up to what range (line-of-sight altitude)?

50 NM

199 NM

100 NM

Correct answer is – 199 NM

Q20. What is the function of the transponder in the DME system?

To receive interrogation pulses and send a reply

To measure the aircraft altitude

To transmit interrogation pulses

Correct answer is – To receive interrogation pulses and send a reply

Q21. How does radar determine the distance to an object?

By measuring the time delay between sending the pulse and receiving the echo

By measuring the strength of the radio signal received

By calculating the angle of the transmitted radio wave

Correct answer is B – By measuring the time delay between sending the pulse and receiving the echo

Q22. Doppler radar can measure the speed of an object by using:

Change in frequency of the reflected waves

Strength of the radio wave

The time delay of the signal

Correct answer is B – Change in frequency of the reflected waves

Q23. What is the equation used to calculate the slant range distance in DME?

R = T / 50

R = (T + 50) * 12.359

R = (T - 50) / 12.359

Correct answer is – R = (T – 50) / 12.359

Q24. What happens to the DME distance reading when the aircraft is directly above the ground station?

It shows zero distance

It shows an error and no reading

It shows the aircraft’s height in nautical miles

Correct answer is – It shows the aircraft’s height in nautical miles

Q25. How does Monopulse Secondary Surveillance Radar (MSSR) differ from Primary Surveillance Radar (PSR)?

MSSR uses transponder replies to provide aircraft identity and altitude, while PSR detects all reflected signals

MSSR can only detect ground targets, whereas PSR can detect airborne targets

MSSR sends continuous waves, PSR uses short pulses

Correct answer is A – MSSR uses transponder replies to provide aircraft identity and altitude, while PSR detects all reflected signals

Q26. What is the meaning of the term “slant range”?

The straight-line distance between aircraft and station, including altitude

Time taken for the pulse to travel one way

Horizontal distance between aircraft and station

Correct answer is – The straight-line distance between aircraft and station, including altitude

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