22. 'PPP in a radar system stands for
A. plan position image
B. pulse position indicator
C. plan position indicator
D. none of the above

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23. In radar reception, the term ratrace' is used in connected with
A. modulator
B. duplexer
C. pulse characteristics
D. receiver bandwidth

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24. The A-scope of a radar displays
A. no 'grass'
B. traget position and range
C. traget range but not position
D. target position but not range

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25. A bistatic radar has
A. transmitting and receiving antennas at the same point
B. transmitting and receiving antennas separated by quite large distances
C. two static antennas
D. two static displays

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26. The duty oycle in a pulses radar transmitter cannot be increased beyond a point because it
A. affects the operating frequency
B. increase the average power of the transmitter tube
C. does not detect peak signals
D. None of the above

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27. One method of solving 'blind speed' problem is to
A. use a variable PRF
B. use digital MTI
C. change Doppler frequency
D. use short wavelength

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28. The lowest 'blind speed' of a radar erating at 6 GHz with a PRF of 1000 pps is ? m/s
A.6000
B.166.7
C.50
D.100

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