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CPL Test Series
Question Bank
Questions for DOPPLER
Answer the following questions
Test Mode
Training Mode
1. When an aircraft is flying directly away from a transmitter, transmitting on a frequency of 15 GHz, a frequency shift of 6.0 kHz is measured. The speed of the aircraft is
120 kt
300 kt
222 ms-1
222 kt
2. An aeroplane is flying at 486 kt directly towards a beacon transmitting on a frequency of 12 GHz. The change in frequency observed will be
6.25 kHz
10 MHz
10 kHz
6.25 Hz
3. The change in frequency measured in an aircraft from a radio transmission reflected from the ground is used to determine
the drift and groundspeed of the aircraft
the aircraft's track and speed
track error and groundspeed
the across track wind component and heading
4. Doppler operates on the principle that ...... between a transmitter and receiver will cause the received frequency to ...... if the transmitter and receiver are moving .....
apparent motion, decrease, together
the distance, increase, at the same speed
relative motion, decrease, apart
relative motion, increase, apart
5. Due to ‘Doppler' effect an apparent decrease in the transmitted frequency, which is proportional to the transmitter's velocity, will occur when
the transmitter and receiver move towards each other
the transmitter moves away from the receiver
both transmitter and receiver move away from each other
the transmitter moves towards the receiver
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