A03: Radar Quiz

Q1. DME full form is?

Digital Measuring Equipment

Distance measuring equipment

Distance Maintaining Equipment

Correct answer is – Distance measuring equipment

Q2. Radar works by sending out radio waves and then:

Ignoring the reflected signals

Sending continuous sound waves

Listening for signals that bounce back from objects

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

Q3. Which navigation systems is DME commonly used with?

VOR and ILS

ADF and GPS

TACAN only

Correct answer is – VOR and ILS

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. What is the typical frequency range used by DME?

225–400 MHz

960–1215 MHz

118–137 MHz

Correct answer is – 960–1215 MHz

Q6. DME provides which type of distance measurement?

Bearing distance

Slant range distance

Horizontal ground distance

Correct answer is – Slant range distance

Q7. 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

Q8. 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

Q9. How long is the fixed beacon delay accounted for in DME calculations?

25 microseconds

100 microseconds

50 microseconds

Correct answer is – 50 microseconds

Q10. How does radar determine the distance to an object?

By calculating the angle of the transmitted radio wave

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

By measuring the strength of the radio signal received

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

Q11. How does secondary radar differ from primary radar?

Secondary radar uses reflected pulses only

Secondary radar transmits and receives on the same frequency

Secondary radar receives a reply from the target’s transponder

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

Q12. 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

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

Only altitude measurement

Only bearing information

Very accurate slant range data for position fixing

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

Q14. Which radar type uses aircraft transponders to get information like identity and altitude?

Surface Movement Radar (SMR)

Monopulse Secondary Surveillance Radar (MSSR)

Primary Surveillance Radar (PSR)

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

Q15. Which frequency band is commonly used for long-range air traffic control radar?

L band (1–2 GHz)

Ku band (12–18 GHz)

C band (4–8 GHz)

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

Q16. 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

Q17. What happens to the DME distance reading when the aircraft is directly above the ground station?

It shows an error and no reading

It shows the aircraft’s height in nautical miles

It shows zero distance

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

Q18. 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

Q19. What is the meaning of the term “slant range”?

Horizontal distance between aircraft and station

Time taken for the pulse to travel one way

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

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

Q20. How often is the station identification (3-letter Morse code) transmitted by the DME ground station?

Every 60 seconds

Every 30 seconds

Every 10 seconds

Correct answer is – Every 30 seconds

Q21. Doppler radar can measure the speed of an object by using:

Strength of the radio wave

The time delay of the signal

Change in frequency of the reflected waves

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

Q22. 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

Q23. (DME) operate on?

Primary radar principle

Secondary radar principle

Continuous wave radar principle

Correct answer is – Secondary radar principle

Q24. What is the main purpose of Radar?

To send radio messages

To amplify signals

To detect objects and measure their distance

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

Q25. What does RADAR stand for?

Radio Detection And Ranging

Radio Direction And Reception

Radio Distance And Refracting

Correct answer is A – Radio Detection And Ranging

Q26. 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

Tracking aircraft in flight at long range

Measuring the speed of airplanes during takeoff

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

Results