21. The minimum Doppler shift is :
(a) zero
(b) transmitter frequency
(c) infinity
(d) 100 KHz
22. Bistatic radar has :
(a) two antennas at the same location
(b) two antennas at different locations
(c) two identical antennas at the same place
(d) two different antennas at the same place
23. Kalman filter is :
(a) a low pass filter circuit
(b) a high pass filter circuit
(c) an algorithm
(d) a band filter circuit
24. Directional coupler is :
(a) a switch
(b) an amplifier
(c) an oscillator
(d) an active device
25. LIDAR means :
(a) Linear Detection and Ranging
(b) Light Detection and Ranging
(c) Linear Detection Radar
(d) Light Detection Radar
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