64. The range of a radar is
A. directly proportional to the gain of the radar antenna
B. directly proportional to the minimum detectable signal by the receiver
C. inversely proportional to the gain of the radar antenna
D. inversely proportional to the transmitted power

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65. Which of the following is essential for fast communication?
A. High S/N ratio
B. High channel capacity
C. large bandwidth
D. all of the above

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66. The maximum range of a radar depends on
A. pulse frequency
B. pulse duration
C. pulse energy
D. none of the above

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67. A target is moving with a velocity of 360 km/hour radially towards the transmitting frequency generator of 3 GHz will be
A. 300 Hz
B. 1 kHz
C. 1.5 kHz
D. 2 kHz

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68. The minimum range of detection by a pulse radar depends on
A. pulse width
B. average transmitter power
C. beam width of the antenna
D. all of the above

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69. Which one of teh following is used for 1FF?
A. CW radar
B. MI!
C. ordinary radar
D. Beacon

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70. The minimum receivable signal in a radar receiver whose IF, bandwidth is 1.5 MHz and which has a noise figure 9 dB, will be
A. 4.16 x 10-10watt
B. 4.16 x 10-12 watt
C. 4.16 x 10-13 watt
D. 4.16 x 10-14 watt

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