49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
# Radar and sonar
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- What is the main difference between active and passive sonar?
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a) Active sonar uses lower frequencies than passive sonar
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b) Passive sonar emits no energy while active sonar does
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c) Passive sonar has a maximum operating range of 10 to 100 kilometers while active sonar can detect objects at longer ranges
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d) Active sonar listens to underwater sounds, while passive sonar transmits sound pulses.
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Answer: b) Passive sonar emits no energy while active sonar does.
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- 2. What is the main challenge facing radar systems?
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a) The ability to accurately determine an object's direction
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b) The conflict between the ability to detect objects at a long range and the ability to accurately determine an object's distance
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c) The noise level of the radio receiver
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d) The difficulty in selecting and generating different pulse shapes and lengths.
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Answer: b) The conflict between the ability to detect objects at a long range and the ability to accurately determine an object's distance.
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- 3. What is the advantage of using lower frequencies in passive sonar?
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a) They propagate through the water with less absorption
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b) They allow for better distance determination without reducing the operating range
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c) They increase the range without degrading the distance determination
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d) They enable the rapid selection and generation of different pulse shapes and lengths.
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Answer: a) They propagate through the water with less absorption.
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- 4. What is the main advantage of using DSP in radar systems?
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a) To increase the operating range of the radar system
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b) To accurately determine an object's direction
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c) To provide better distance determination without reducing the operating range
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d) To decrease the noise level of the radio receiver.
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Answer: c) To provide better distance determination without reducing the operating range. |