7-45. Radio waves travel much faster than sound waves? 1. True 2. False 7-46. What rating normally maintains AEW equipment? 1. AT 2. AE 3. AQ 4. AW 7-47. What characteristics make radar suitable for directing fire control radar systems? 1. Range measurement 2. Target display 3. Narrow focused radar beam 4. All of the above 7-48. What is the purpose of IFF? 1. Fire control 2. Navigation 3. Early warning 4. Distinguishing friend from foe 7-49. Selective Identification Feature (SIF) was developed to expand the IFF system. 1. True 2. False 7-50. What are the two types of electronic countermeasures? 1. Active and passive 2. Active and progressive 3. Passive and collective 4. Passive and interceptor 7-51. What type of ECM uses jamming? 1. Passive only 2. Active only 3. Passive and active 4. Passive and progressive 7-52. Which of the following detection devices is used to detect submarines? 1. Sonar 2. Sonobuoy 3. Magnetic  Anomaly  Detection  (MAD) equipment 4. Each of the above 7-53. Which of the following statements is NOT true concerning sonobuoys? 1. They  are  dropped  from  carrier-based aircraft 2. They are dropped from land-based aircraft 3. They are expendable 4. They are nonexpendable 7-54. Upon what principle does MAD operate? 1. Light 2. Radar 3. Sound 4. Magnetic field 7-55. What rating operates ASW equipment? 1. AE 2. AT 3. AQ 4. AW 7-26