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!!!Block 14 Q9AA
Quiz 9 -- 50
| Question | Answer |
|---|---|
| 1. Why are local weld repairs not recommended for repairing exhaust pipes on recip engines? No welding is allowed Difficulty in identifying the base metal A&P mechanics do not know how to weld | Difficulty in identifying the base metal |
| 2. What is the purpose of a slip joint in an exhaust collector ring? It aids in alignment & absorbs heat expansion It reduces vibration and increases cooling It permits the collector ring to be installed in one piece | It aids in alignment & absorbs heat expansion |
| 3. Leaking oil seals on an externally driven turbocharger (turbine side) may be first detected by. Carbon monoxide poisoning High manifold pressure Black smoke out the exhaust | Black smoke out the exhaust |
| 4. The purpose of an intercooler when used with a turbocharger is to cool the. exhaust gasses before they come in contact with the turbo drive turbocharger bearings air entering the carburetor / throttle body from the turbocharger | air entering the carburetor / throttle body from the turbocharger |
| 5. When the waste gate on an externally driven turbocharger is fully closed; what effect would it have? Engine failure No turbo boost Full turbo boost | Full turbo boost |
| 6. Ball joints / slip joints in recip exhaust systems should be installed. Tight enough to prevent any movement Loose enough to permit some movement Ball joints / slip joints are never used | Loose enough to permit some movement |
| 7. Correct hardware should always be used found in the IPC; however, in general, what type of hardware should be used when on a typical recip exhaust system? Bronze or special high temperature nuts Brass or special high temperature nuts Titanium oxide nuts | Brass or special high temperature nuts |
| 8. Exhaust manifold gaskets can be re-used a maximum of one time. True or False? True False | False |
| 9. If the oil out line on a waste gate actuator were broken / open; how would that effect turbocharger operation? Turbocharger would produce max turbo All turbocharging would stop Turbocharger overspeed | Turbocharger would produce max turbo |
| 10 .An increase in manifold pressure when carburetor heat is applied indicates. ice was already forming in the carburetor mixture was too lean overheating of the cylinder heads | ice was already forming in the carburetor |
| 11. Does a supercharger system usually incorporate a turbine to drive the compressor? Yes No | No |
| 12. What directly regulates the speed of a supercharger? waste gate crankshaft speed manifold pressure | crankshaft speed |
| 13. What is the purpose of a sonic venturi on a turbocharged reciprocating engine? Increase air velocity as it exits the turbocharger compressor Limits air from the turbo to the cabin for pressurization Decreases fuel / air ration to the intake manifold | Limits air from the turbo to the cabin for pressurization |
| 14. If the waste gate spring is damaged or not installed, would the turbocharger function normally? Yes No no effect on turbocharger operation | No |
| 15. If an exhaust system on a recip engine is ceramic coated; how should it be cleaned? Sand blasting Degreasing Use of high alkali cleaners | Degreasing |
| 16. Under normal conditions; when carburetor heat is applied; how is engine RPM effected? slight decrease slight increase engine RPM remains the same | slight decrease |
| 17. What is a potential hazard if operating a turbocharger at excessive speeds for a long period of time? exhaust leaks turbine failure due to high temps and overspeed no issues | turbine failure due to high temps and overspeed |
| 18. Carburetor heat is not generally used on take-off unless absolutely necessary because of. possibility of induction system over boost fuel economy loss of power and possible detonation | loss of power and possible detonation |
| 19. Sub-sonic turbofan engines utilize what type of exhaust nozzle? divergent convergent convergent-divergent | convergent |
| 20. When the exhaust area of a turbojet engine physically changes shape during flight is referred to as... (Select all that are correct) Convergent / Divergent Variable Geometry Variable AreaNone of the above | Variable Geometry |
| 21. How can exhaust leaks be detected? Fluctuating manifold pressure Signs of soot on or near the gas leakage area Touching the suspected leakage area during engine run | Signs of soot on or near the gas leakage area |
| 22. A turbo-compound turbocharger is driven by the crankshaft. True or False? True False | False |
| 23. All supersonic aircraft engines must incorporate what type of exhaust nozzle? Convergent Divergent Convergent / Divergent | Convergent / Divergent |
| 24. All air entering a gas turbine engine must be at what speed? Above M1 Below M1 Equal to M1 | Below M1 |
| 25. What section of any gas turbine engine must be split into two paths to operate correctly? Compressor section Combustion section Turbine section | Combustion section |
| 26. Internally driven superchargers are driven by. exhaust gasses crankshaft the camshaft | crankshaft |
| 27. Externally driven turbochargers are driven by the. crankshaft exhaust gasses hydraulic pressure | exhaust gasses |
| 28. What circuit must be engaged for thrust reversers & vortex dissipators to function on a turbofan engine? A airspeed switch A weight on wheels / "squat" switch A reduction gearbox RPM limiter switch | A weight on wheels / "squat" switch |
| 29. Regarding inlet pressure in a turbocharged system; the pressure between the compressor discharge and the throttle body inlet is referred to as. intake pressure manifold pressure upper deck pressure | upper deck pressure |
| 30. An exhaust nozzle / tail pipe on a helicopter turbine engine should be what design? Convergent Divergent Straight | Divergent |
| 31. As manifold pressure increases in a recip engine, the. volume of air in the cylinders increases weight of the fuel / air charge decreases density of air in the cylinder increases | density of air in the cylinder increases |
| 32. Compared to normally (naturally) aspirated engines, turbocharged engine exhaust systems operate at. similar temperatures and higher pressures higher temperatures and higher pressures similar temperatures and pressures | higher temperatures and higher pressures |
| 33. On aircraft equipped with thrust reverser systems; thrust reversers are capable of producing between. 35% and 50% of the rated thrust in the reverse direction 35% and 75% of the rated thrust in the direct direction 35% and 65% of the rated thrust in the reverse direction | 35% and 50% of the rated thrust in the reverse direction |
| 34. What directly regulates the speed of a turbocharger? turbine construction waste gate position throttle | waste gate position |
| 35. What tools should not be used when working on a recip exhaust component? Chrome plated Zinc or galvanized plated Aluminum plated | Zinc or galvanized plated |
| 36. A sloppy weld on an recip engine exhaust system can lead to. Engine back firing Localized hot spots Engine failure | Localized hot spots |
| 37. Thrust vectoring helps to accelerate the speed of a turbojet engine. True or False? True False | False |
| 38. What is the hottest component on a gas turbine engine? Compressor outlet Combustion section First stage turbine inlet nozzle | First stage turbine inlet nozzle |
| 39. One method of detecting small leakage defects in a recip exhaust piping system is. Cap; apply high pressure air and submerge in water Cap, apply low pressure air and submerge in water Florescent penetrant | Cap, apply low pressure air and submerge in water |
| 40. A thrust reverser on a turbofan engine that uses the bypass air is referred to as. Mechanical blockage Aerodynamic blockage Clamshell type | Aerodynamic blockage |
| 41. When sandblasting method is used to clean exhaust components on a recip engine, what precautions should be observed? Limit the pressure used Never use recovered sand that has been used on other metals Never sand blast exhaust components | Never use recovered sand that has been used on other metals |
| 42. The inlet design of a typical turbofan engine is what design? Convergent Divergent Straight | Divergent |
| 43. Where is the highest pressure in a gas turbine engine? Combustion inlet Exhaust outlet Compressor outlet / Diffuser inlet | Compressor outlet / Diffuser inlet |
| 44. Why is high Nickle chromium steel used in many exhaust systems? high heat conductivity and flexibility corrosion resistance and low expansion coefficient corrosion resistance and high heat conductivity | corrosion resistance and low expansion coefficient |
| 45. How does a mechanical blockage thrust reverser function on a turbojet or low bypass turbofan engine? Blocking and reversing only the cold stream thrust Blocking and reversing only hot stream thrust Blocking and reversing both hot stream & cold stream thrust | Blocking and reversing both hot stream & cold stream thrust |
| 46. Chalk is always a safe / approved choice when marking hot section components. True or False? True False | True |
| 47. What is the primary purpose of an augmenter used in some recip engines? To reduce exhaust back pressure To aid in cooling the engine To assist in displacing the exhaust gasses | To aid in cooling the engine |
| 48. What system can help reduce FOD ingestion on a turbofan engine? A bell mouth inlet screen A vortex dissipator A partical separator | A vortex dissipator |
| 49. Oil pressure delivered to the waste gate actuator overcomes spring pressure on the waste gate and drives the waste gate position towards the closed position. True or false? False True waste gate does not include a spring | True |
| 50. Most waste gates on an externally driven turbocharger are driven by oil pressure but some systems can be manually operated. True or False? True False | True |
Created by:
sampizzuto
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