6-12. Compressor stalls may be eliminated by using which of the following systems? 1. Rotor vane and stator vane system 2. Inlet guide vane and stator vane system 3. Front and rear compressor system 4. Compressor bleed-air system and variable vane system 6-13. Which    of    the    following    is    NOT    a    basic requirement   for   a   satisfactory   and   efficient combustion chamber system? 1. Light weight 2. A minimum pressure drop 3. A high rate of burning 4. Can-annular design 6-14. Fuel is introduced into the combustion chamber at what location? 1. Back of the combustion chamber 2. Top of the combustion chamber 3. Front of the combustion chamber 4. Bottom of the combustion chamber 6-15. A gas turbine engine normally has provisions for  what  total  number  of  igniter  plugs  in  the combustion chamber? 1. One 2. Two 3. Three 4. Four 6-16. The  flame  from  the  chambers  containing  the igniter    plugs    is    spread    to    the    remaining chambers through what design feature? 1. Guide vanes 2. Drilled holes 3. Flame tubes/cross ignition tubes 4. Louvers 6-17. What   percent   of   the   air   in   the   combustion chamber actually takes part in the combustion process? 1. 25% 2. 35% 3. 45% 4. 55% 6-18. Secondary    air    is    used    in    the    combustion chamber for what purpose? 1. To dilute and cool the hot gases 2. To help the combustion process 3. To drive the compressor 4. To drive the turbine 6-19. What    function    does    the    turbine    assembly serve? 1. It develops exhaust gas power 2. It reduces the speed of the compressor 3. It increases the turbine gas temperatures 4. It drives the compressor 6-20. The     flowing     gases     from     the     combustion chamber    of    a    turbojet    engine    act    directly against what engine component? 1. Impeller 2. Compressor 3. Turbine disk blades 4. Auxiliary equipment 6-21. Turbine blades are normally made from what material alloy? 1. Copper 2. Aluminum 3. Magnesium 4. Steel 6-22. What  is  the  function  of  the  inner  cone  in  the exhaust section? 1. To eliminate exhaust gas turbulence 2. To direct air to the outer exhaust cone 3. To give support to the exit guide vanes 4. To cool the turbine wheel 6-23. The inner cone is attached to the outer cone by what means? 1. Copper alloy tubes 2. Streamlined vanes called brace assemblies 3. Stainless steel sheets 4. Tapered cylinder-shaped brackets 6-24. The exhaust cone is made from what material? 1. Aluminum alloy 2. Stainless steel sheets 3. High-temperature alloy 4. Low-temperature alloy 6-25. What material is used to insulate the cone? 1. High-temperature alloy 2. Copper sheets 3. Aluminum alloy sheets 4. Aluminum foil 6-26. The turboprop engine is capable of developing what    maximum    horsepower    per    pound    of weight? 1. 1/2 hp 2. 1 1/2 hp 3. 2 hp 4. 2 1/2 hp 6-22