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1) A military aircraft can use _____ as a countermeasure for IR detection. a. flares b. lift c. glares d. engine temperature increase
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2) Plume emissions can be reduced by ___________ a. quickly mixing exhaust with outside air b. increasing exhaust temperature c. increasing engine outlet temperature d. increasing plume temperature
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3) Which of the following is one of the countermeasures for IR detection? a. Decoy b. Temperature increase c. Engine exhaust temperature increase d. Not mixing plume with outside air
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4) Sun glint affects the IR detection of an aircraft. a. True b. False
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5) To improve IR detection of engine, we can ____________ a. hide the nozzle from expected location of an IR sensor b. use higher exhaust temperature c. show nozzle at IR sensor d. nozzle does not affect the IR detection
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6) Visual detection is based on? a. A/C size, color, etc b. Only size c. Only weight d. Only color
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7) Visual detection is one of the important parameters for an aircraft. a. True b. False
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8) Which of the following is correct? a. Typically, in simulated combat we can detect large aircraft quickly than the smaller aircraft b. Lift is always the same as weight c. We cannot detect large aircraft at all d. We can always find small aircraft
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9) In order to reduce background contrast, we can provide ____________ a. camouflage pattern b. red color pattern only c. always use black color d. always use red and black pattern
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10) For ground background, camouflage paint scheme consists ______________ a. mottled grey green b. mottled white c. black and red d. yellow and red only
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11) Camouflage patterns for sky background will include ______________ a. dirty blue-grey b. clean red c. clean pink d. dirty red always
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12) A. Typical aircraft will have lighter colors at lower surface.
R. The background lookup angle is sky. a. Both [A] and [R] are true and [R] is the correct reason for [A] b. Both [A] and [R] are true but [R] is not the correct reason for [A] c. Both [A] and [R] are false d. [A] is false but [R] is true
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13) Higher contrast between different parts of aircraft will _____________ a. increase detectability b. decrease c. increases twice times always d. always decreases by two units
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14) Which of the following is correct? a. Canopy glint can affect the visual detection of an aircraft b. Canopy glint will have zero effect on visual detection c. Weight is lift all time d. Thrust is drag all the time
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15) An observer is observing in an aircraft from distance of 2400 feet. If size of the aircraft can be given as 24000 feet then, what will be the simplified value of visual angle in minutes of arc? Consider all simplified environment and ideal conditions. a. 34380 b. 3438 c. 343 d. 34
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16) If my aircraft has luminance of 10 unit and is designed to operate in background which has luminance of 8 unit then, what will be the approximate value of contrast? a. 0.25 unit b. 1.25 c. 5.25unit d. 5.26
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17) Noise produced by an aircraft is called __________ a. aural signature b. aurora beam c. signal beam d. ir beam
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18) Primary cause of aircraft noise is ___________ a. engine exhaust b. lift c. fuselage d. cabin
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19) Small diameter and high velocity jet will produce _____________ a. more noise b. less noise c. less aural signature d. independent of diameter and velocity
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20) Arrange in the correct order of noise produced by engine type. a. Turbojet > turbofan > reciprocating engine b. Turbojet < turbofan < reciprocating engine c. Turbojet > turbofan = reciprocating engine d. Turbojet > turbofan < reciprocating engine
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21) To reduce piston exhaust noise ______________ a. we can use more mufflers b. mufflers can be used only c. reduce lift always d. increase jet speed always
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22) Propeller aircraft experiences internal noise. a. True b. False
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23) Which of the following is correct? a. Some clearance should be provided between propeller and fuselage b. Lift will be reduced if only drag is reduced c. Thrust will be lower than the drag always d. Engine exhaust does not make any noise
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24) To reduce aural signatures of engine exhaust, we can use _____________ a. insulating material b. lofting c. drafting d. non-insulating material
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25) Let’s consider a propeller aircraft propeller diameter of 24 feet then, what would be the minimum value of clearance that is required for safe operation of propeller typically? a. 6ft b. 8ft c. 10ft d. 20ft
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26) By directing the exhaust away from the ground we can _____________ a. reduce the aural signature b. increase the aural signature c. increase noise d. noise is not dependent on the direction of exhaust
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27) How to reduce engine noise? a. By using chevron nozzle b. By using high velocity jet c. Using small diameter and high velocity jet d. Higher exhaust jet with less diameter of exhaust
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28) Vulnerability of an aircraft is ability of the aircraft ______________ a. to sustain damage, continue flying and return to base b. to get damaged and failed c. to the radar detection d. to an IR detection
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29) __________ is key parameter for vulnerability. a. Vulnerable area b. RCS c. IR d. Visual area
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30) Vulnerable area will be same for each and every aircraft. a. True b. False
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31) FMEA stands for? a. Failure modes and effect analysis b. Failure mass and effect analysis c. Failure mass and effective analogy d. Failure modes and effect analogy
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32) FMEA will consider _____________ a. which battle damage can affect individual aircraft components? b. lift c. weight by an aircraft d. rcs
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33) We can improve vulnerability by _____________ a. avoiding fuel tanks near to the engine b. placing fuel tanks on the engine c. placing fuel tanks inside the engine d. placing fuel tanks at any location
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34) A firewall should be provided for vulnerability consideration. a. True b. False
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35) In order to improve vulnerability consideration, we can use _________ a. redundant components b. high lift device c. vortex generator d. we cannot improve it
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36) An aircraft component has presented area 6 ft2 with Pk as 1.0. Find vulnerable area. a. 6ft2 b. 82ft2 c. 7ft2 d. 72ft2
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37) If an aircraft has three components which can be considered as vulnerable components then, evaluate total vulnerable area. Given area of component 1, 2 and 3 are 5ft2, 4ft2 and 80ft2 respectively with Pk as 1, 0.5 and 0.3 for component 1, 2 and 3 respectively. a. 31ft2 b. 50ft2 c. 10ft2 d. 4ft
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38) Positioning of the propeller should be such that _____________ a. blade will not strike anyone if they fly off b. blade should fly off during flight c. it is always near to cabin d. the blades will strike the engine
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39) Typically, in a passenger aircraft fuel is not located in the fuselage. a. True b. False
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40) What do you mean by crashworthiness? a. Capability of structure to protect against impacts and crash loads b. Capability of an aircraft to stay in cruise c. Vulnerability to radar detection d. Special aerodynamic lift improvement
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