This is the Multiple Choice Questions in Chapter 16: Radar Systems from the book Electronic Communication Systems by George Kennedy. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. If the peak transmitted power in a radar system is increased by a factor of 16, the maximum range will be increased by a factor
- a. 2
- b. 4
- c. 8
- d. 16
2. If the antenna diameter in a radar system is increased by a factor of 4, the maximum range will be increased by a factor of
- a. √2
- b. 2
- c. 4
- d. 8
3. If the ratio of the antenna diameter to the wavelength in a radar system is high this will result in (indicate the false statement)
- a. large maximum range
- b. good target discrimination
- c. difficult target acquisition
- d. increased capture area
4. The radar cross section of a target (indicate the false statement)
- a. depends on the frequency used
- b. may be reduced by special coating of the target
- c. depends on the aspect of a target, if this non-spherical
- d. is equal to the actual cross-sectional area for small targets
5. Flat-topped rectangular pulses must be transmitted in radar to (indicate the false statement)
- a. allow a good minimum range
- b. make the returned echoes easier to distinguish from noise
- c. prevent frequency changes in the magnetron
- d. allow accurate range measurements
6. A high PRF will (indicate the false statement)
- a. make the returned echoes easier to distinguish from noise
- b. make target tracking easier with conical scanning
- c. increase the maximum range
- d. have no effect on the range resolution
7. The IF bandwidth of a radar receiver is inversely proportional to the
- a. pulse width
- b. pulse repetition frequency
- c. pulse interval
- d. square root of the peak transmitted power
8. If a return echo arrives after the allocated pulse interval,
- a. it will interfere with the operation of the transmitter
- b. the receiver might be overloaded
- c. it will not be received
- d. the target will appear closer than it really is
9. After a target has been acquired, the best scanning system for tracking is
- a. nodding
- b. spiral
- c. conical
- d. helical
10. If the target cross section is changing, the best system for accurate tracking is
- a. lobe switching
- b. sequential lobing
- c. conical scanning
- d. monopulse
11. The biggest disadvantage of CW Doppler radar is that
- a. it does not give the target velocity
- b. it does not give the target range
- c. a transponder is required at the target
- d. it does not give the target position
12. The A scope displays
- a. the target position and range
- b. the target range, but not position
- c. the target position, but not range
- d. neither range nor position, but not only velocity
13. The Doppler effect is used in (indicate the false statement)
- a. moving-target plotting on the PPI
- b. the MTI system
- c. FM radar
- d. CW radar
14. The coho in MTI radar operates at the
- a. intermediate frequency
- b. transmitted frequency
- c. received frequency
- d. pulse repetition frequency
15. The function of the quartz delay line in an MTI radar is to
- a. help in subtracting a complete scan from the previous scan
- b. match the phase of the coho and the stalo
- c. match the phase of the coho and the output oscillator
- d. delay a sweep so that the next sweep can be subtracted from it
16. A solution to the “blind speed” problem is
- a. to change the Doppler frequency
- b. to vary the PRF
- c. to use monopulse
- d. to use MTI
17. Indicate which one of the following applications or advantages of radar beacons is false:
- a. Target identification
- b. Navigation
- c. Very significant extension of the maximum range
- d. More accurate tracking of enemy targets
18. Compared with other types of radar, phased array radar has the following advantages (indicate the false statement)
- a. very fast scanning
- b. ability to track and scan simultaneously
- c. circuit simplicity
- d. ability to track many targets simultaneously
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