3-33. The projector of the AN/GMQ-13( ) has a 3-38. 

 duel light projecting system because if 

 one lamp fails the other will continue to 

 sweep a light beam skyward, and with two 

 light beams 



1. the degree of penetration is greater 



2. breaks in clouds can be spotted 

 easier 



3. the speed of sweep is decreased 



4. the rate of measurement is increased 3-39. 



3-3A. The rotary movement of the projector of 

 the AN/GMQ-13( ) rotates at a speed that 

 permits the actual sweep of each optical 

 system to last 



1. 12 sec 



2. 6 sec 



3. 3 sec 



4. 5 sec 3-40. 



3-35. The reflectors on both the detector and 

 projector of the AN/GMQ-13( ) are 

 cleaned with a clean cloth and alcohol by 

 the technicians; however, water should 

 be used by the Aerographer 's Mate instead 

 of alcohol in cleaning the 



1. indicator cover 



2. detector cover glass 



3. detector reflectors 3-41. 



4. projector reflectors 



3-36. What is the elapsed time value if a 



ceiling balloon begins to fade into a 

 cloud layer 40 seconds after release and 

 completely disappears 46 seconds after 

 release? 



1. 40 sec 3-42. 



2. 43 sec 



3. 44 sec 



4. 46 sec 



Learning Objective: Recognize 



functions, maintenance practices, 



operating principles and procedures, 3-43. 



and construction features of the 



various visibility measuring 



elements. 



3-37. The AN/GMQ-10( ) directs a beam of light 



toward its receiver located 500 feet away. 

 The amount of light reaching the receiver 

 varies with the 



1. time of day 



2. angle of rotary motion 



3. intensity of the light beam 



4. density of the haze or fog in the 

 path between the two instruments 



Which component of the AN/GMQ-10( ) 

 receiver generates a pulse signal? 



1. The telescope 



2. The telescope's objective lens 



3. The photoelectric detector within 

 the telescope 



4. The iris diaphragm behind the 

 telescope's objective lens 



Which of the following operational 

 functions of the AN/GMQ-10( ) is ordi- 

 narily NOT performed by Aerographer' s 

 Mates? 



1. Balancing the pen 



2. Calibrating the set 



3. Installing the chart 



4. Zero adjusting the pen 



Which of the following will NOT result 

 if the pen pressure in the AN/GMQ-10( ) 

 writing system is too great? 



1. The pen will write a heavy line 



2. The pen will write intermittently 



3. The response speed of the pen will 

 be too slow 



4. The pen will tend to drag toward the 

 center of the chart 



What material should be used to remove 

 corrosion within the cabinet of the 

 AN/GMQ-10( )? 



1. Steel wool 



2. Emery cloth 



3. Fine sandpaper 



4. Navy-approved cleaning fluid 



Which of the following AN/GMQ-10( ) 

 components require semiannual lubri- 

 cation? 



1. The recorder and the indicator 



2. The projector and the indicator 



3. The receiver and the projector 



4. The projector power supply and the 

 recorder 



The OA-7900/GMQ-10 uses data from the 

 AN/GMQ-10( ) to determine the Runway 

 Visual Range (RVR) which represents the 

 horizontal distance a pilot can see down 

 the runway from the 



1. approach end 



2. mid point 



3. landing end 



4. intersection of both runways 



18 



