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35 Cards in this Set
- Front
- Back
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Why is high nickel chromium steel used in many exhaust systems? A - high heat conductivity and flexibility B - corrosion resistance and low expansion coefficient C - corrosion resistance and high heat conductivity |
B - corrosion resistance and low expansion coefficient |
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Reciprocating engine exhaust system designs commonly used to provide for ease of installation and/or allow for expansion and contraction, may include the use of 1. spring loaded ball/flexible joints 2. slip joints 3. bellows 4. flexible metal tubing A - 1, 2, 3, and/or 4 B - 1, 2, and/or 4 C - 1, 2, and/or 3 |
C - 1, 2, and/or 3 |
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One source commonly used for carburetor air heat is A - turbocharger heated air B - alternate air heat C - exhaust gases |
C - exhaust gases |
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The hot section of a turbine engine is particularly susceptible to which of the following kind of damage? A - galling B - pitting C - cracking |
C - cracking |
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What is the purpose of a slip joint in an exhaust collector ring? A - it aids in alignment and absorbs expansion B - it reduces vibration and increases cooling C - it permits the collector ring to be installed in one piece |
A - it aids in alignment and absorbs expansion |
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Sodium-filled valves are advantageous to an aviation engine because they A - are lighter B - dampen valve impact shocks C - dissipate heat well |
C - dissipate heat well |
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What type of us are used to hold an exhaust system to the cylinders? A - brass or heat-resistant nuts B - high-temperature fiber self-locking nuts C - high-temperature aluminum self-locking nuts |
A - brass or heat-resistant nuts |
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Repair of exhaust system components A - is impossible because the material cannot be identified B - must be accomplished by the component manufacturer C - is not recommended to be accomplished in the field |
C - is not recommended to be accomplished in the field |
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on turbojet powered airplanes, thrust reversers are capable of producing between A - 35 and 50 percent of the rated thrust in the reverse direction B - 35 and 75 percent of the rated thrust in the reverse direction C - 35 and 65 percent of the rated thrust in the reverse direction |
A - 35 and 50 percent of the rated thrust in the reverse direction |
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On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected? A - x-rayed to detect any cracks B - hydrostatically tested C - with the heater air shroud removed |
C - with the heater air shroud removed |
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How should ceramic-coated exhaust components be cleaned? A - with alkali B - by degreasing C - by mechanical means |
B - by degreasing |
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Which of the following indicates that a combustion chamber of a jet engine is not operating properly? A - clam shells stick in thrust reverse position B - hot spots on the tail cone C - warping of the exhaust duct liner |
B - hot spots on the tail cone |
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Select a characteristic of a good weld on exhaust stacks. A - the weld should be build up 1/8 inch B - porousness or projecting globules should show in the weld C - the weld should taper off smoothly into the base metal |
C - the weld should taper off smoothly into the base metal |
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How do the turbines which are driven by the exhaust gases of a turbo-compound engine contribute to total engine power output? A - by driving the crankshaft through suitable couplings B - by driving the supercharger, thus relieving he engine of the supercharging load C - by converting the latent heat energy of the exhaust gases into thrust by collecting and accelerating them |
A - by driving the crankshaft through suitable couplings |
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How should corrosion-resistant steel parts such as exhaust collectors be blast cleaned? A - use steel grit which has not previously been used on soft iron B - use super fine granite grit C - use sand which has not previously been used on iron or steel |
C - use sand which has not previously been used on iron or steel |
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Power recovery turbines used on some reciprocating engines are driven by the A - exhaust gas pressure B - crankshaft C - velocity of the exhaust gases |
C - velocity of the exhaust gases |
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Reciprocating engine exhaust systems that have repairs or sloppy weld beads which protrude internally are unacceptable because they cause A - base metal fatigue B - localized cracks C - local hot spots |
C - local hot spots |
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Ball joints in reciprocating engine exhaust systems should be A - tight enough to prevent any movement B - disassembled and the seals replaced every engine change C - loose enough to permit some movement |
C - loose enough to permit some movement |
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All of the following are recommended markers for reciprocating engine exhaust systems except A - india ink B - lead pencil C - prussian blue |
B - lead pencil |
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How are combustion liner walls cooled in a gas turbine engine? A - by secondary air flowing through the combustion chamber B - by the pattern of holes and louvers cut in the diffuser section C - by bleed air vented from the engine air inlet |
A - by secondary air flowing through the combustion chamber |
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Augmenter tubes are part of which reciprocating engine system? A - induction B - exhaust C - fuel |
B - exhaust |
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Dislodged internal muffler baffles on a small reciprocating engine may A - obstruct the muffler outlet and cause excessive exhaust back pressure B - cause the engine to run excessively cool C - cause high fuel and oil consumption |
A - obstruct the muffler outlet and cause excessive exhaust back pressure |
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What is the purpose of an exhaust outlet guard on a small reciprocating engine? A - to prevent dislodged muffler baffles from obstructing the muffler outlet B - to reduce spark exit C - to shield adjacent components from excessive heat |
A - to prevent dislodged muffler baffles from obstructing the muffler outlet |
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What could be a result of undetected exhaust system leaks in a reciprocating engine powered airplane? A - pilot/passenger incapacitation caused by carbon monoxide entering the cabin B - a rough-running engine with increased fuel consumption C - too low exhaust back pressure resulting in the desired power settings not being attained |
A - pilot/passenger incapacitation caused by carbon monoxide entering the cabin |
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How may reciprocating engine exhaust system leaks be detected? A - an exhaust trail aft of the tailpipe on the airplane exterior B - fluctuating manifold pressure indication C - signs of exhaust soot inside cowling and on adjacent components |
C - signs of exhaust soot inside cowling and on adjacent components |
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Compared to normally aspirated engines, turbocharged engine exhaust systems operate at A - similar temperatures and higher pressures B - higher temperatures and higher pressures C - similar temperatures and pressures |
B - higher temperatures and higher pressures |
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Most exhaust system failures result from thermal fatigue cracking in the areas of stress concentration. The condition is usually cause by A - the drastic temperature change which is encountered at altitude B - improper welding techniques during manufacture C - the high temperatures at which the exhaust system operates |
C - the high temperatures at which the exhaust system operates |
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Thrust reversers utilizing a pneumatic actuating system usually receive operating pressure from A - the engine bleed air system B - an on board hydraulic or electrical powered compressor C - high pressure air reservoirs |
A - the engine bleed air system |
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Operating thrust reversers at low ground speeds can sometimes cause 1. sand or other foreign object ingestion 2. hot gas re-ingestion 3. compressor stalls A - 1, 2, and 3 B - 1 and 2 C - 2 and 3 |
A - 1, 2, and 3 |
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Engines using cold stream, or both cold and hot stream reversing include A - high bypass turbofans B - turbojets C - turbojets with afterburner |
A - high bypass turbofans |
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The purpose of cascade vanes in a thrust revering system is to A - form a solid blocking door in the jet exhaust path B - turn the exhaust gases forward just after exiting the exhaust nozzle C - turn to a forward direction the fan and/or hot exhaust gases that have been blocked from exiting through the exhaust nozzle |
C - turn to a forward direction the fan and/or hot exhaust gases that have been blocked from exiting through the exhaust nozzle |
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Turbojet and turbofan thrust reverser systems are generally powered by 1. fuel pressure 2. electricity 3. hydraulic pressure 4. pneumatic pressure A - 1, 3, and 4 B - 2, 3, and 4 C - 1, 2, and 3 |
B - 2, 3, and 4 |
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The rearward thrust capability of an engine with the thrust reverser system deployed is A - less than its forward capability B - equal to or less than its forward capability, depending on ambient conditions and system design C - equal to its forward capability |
A - less than its forward capability |
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Which statement is generally true regarding thrust reverser systems? A - it is possible to move some aircraft backward on the ground using reverse thrust B - engine thrust reversers on the same aircraft usually will not operate independently of each other (must all be simultaneously) C - mechanical blockage system design permits a deployment position aft of the exhaust nozzle only |
A - it is possible to move some aircraft backward on the ground using reverse thrust |
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What is the proper operating sequence when using thrust reversers to slow an aircraft after landing? A - advance thrust levers up to takeoff position as conditions require, select thrust reverse, de-select thrust reverser, retard thrust levers to ground idle B - retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle C - select thrust reverse, advance thrust reverser levers no higher than 75% N1, and retard thrust reverser levers to idle at approximately normal taxi speed |
B - retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle |
