Powerplant 5

1. To what altitud will a turbocharger engine maintain sea level pressure?. Critical altitude. Sea level altitude. 10000 feet. Take off altitude.

2. Excessive valve clearance in a piston engine is?. Increase valve overlap. Decrease valve gap. Valve overlap. Decrease valve overlap.

3. What could cause excessive pressure buildup in the crankcase of a reciprocating engine?. excessive exhaust gases. Too much oil. Plugged crankcase breather. Manifold pressure is reduced with the throttle control before the RPM is reduced with propeller control reduced with the propeller control.

4. One of the best indicators of reciprocating engines combustion chamber problems is?. high exhaust temperature. Low oil level. Spark plug condition. Detonation sound.

5. To reduce the power output of an engine equipped with a constant speed propeller and operating near maximum BMEP the?. Manifold pressure is reduced with the throttle control before the RPM is reduced with the engine control. Manifold pressure is reduced with the throttle control before the pressure pistons reduce with the propeller control. Manifold pressure is reduced with the throttle control after the RPM is reduce with the propeller control. Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control.

6. When will small induction system air leaks have the most noticeable effect on engine operation?. At low speed. At low RPM. At high RPM. At high speed.

7. What condition will cause an engine to have a increased tendency to detonate?. High intake air temperature. High intake fuel temperature. Rich fuel/air mixture. Rich fuel lead.

8. Backfiring through the carburetor generally result from the use of?. An excessive fuel mixture. An excessive lean mixture. An lack of lean mixture. An excessive air mixture.

9. Which statement pertaining to fuel/air mixture ratio is true?. The mixture ratio which give the best power is lower than the mixture ratio which gives maximum economy. The mixture ratio which give the best power is richer than the mixture ratio which gives maximum economy. The mixture ratio which give the best power is equal than the mixture ratio which gives maximum economy. The mixture ratio which give the best power is richer than the mixture ratio which gives minimum economy.

10. What is the basic operational sequence for reducing the power output of an engine equipped with a constant speed propeller ?. Increase the manifold pressure, then the RPM. Reduce the manifold pressure, then the RPM. Reduce the manifold pressure and increase the RPM. Increase the manifold pressure and reduce the RPM.

11. How may it be determined that a reciprocating engine with a dry sump is pre-oil sufficiently?. After engine run up. From the fuel glass cover. Not show any snag. Oil with flow from the engine return line or indicator port.

12. Which engine servicing operations generally requires engine pre-oiling prior to starting the engine?. Before engine preservation. After engine preservation. Engine installation. Engine removal.

13. 1.- Pre-ignition is caused by improper ignition timing. 2.- Detonation occur when an area of the combustion chamber becomes. incandescent and ignites the fuel/air mixture in advance of normal times ignition. Which one is correct?. Both are true. Only No one. Neither are true. Only No two.

14. Increase water vapor (high relative humidity) in the incoming air to a reciprocating engine will normally result on which of the following?. Decrease engine power at a variable RPM and manifold pressure. Increase engine power at a consistent RPM and manifold pressure. Decrease engine power at a consistent RPM and manifold pressure. Decrease engine power at a consistent RPM and piston pressure.

15. Reduced air density at high altitude has a decided effect on carburetor resulting in a reduction of engine power by?. Excessive enriching the air/fuel mixture. lack of the air/fuel mixture. Excessive enriching of the air. Excessive enriching of the fuel.

16. Direct mechanical push-pull heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted?. Before the stop at the control lever is reached in both HOT and COLD position. Before the stop at the control lever is reached in both HOT/COLD position. Before the stop at the control lever is reached in HOT position. Before the stop at the control lever is reached in COLD position.

17. An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to?. Increase. Decrease. Stay the same. Increase RPM.

18. What is likely to occur if a reciprocating engine is operated at high power setting before it is properly warmed up?. fuel starvation of combustion chamber and other parts. Too much oil on bearing. Oil starvation of bearing and other parts. Oil starvation on engine's parts.

19. Valve clearance changes on opposite type engine using hydraulic filter are accomplished by?. Push valve replacement. valve replacement. hydraulic fuse replacement. Push rod replacement.

20. What is an advantage of using metallic sodium filled exhaust valves in an aircraft reciprocating engine?. Increase valve operating temperature. Reduce valve operating temperature. Reduce posting rings operating temperature. Reduce valve operations.

21. When does valve overlap occur in the operation of an aircraft reciprocating engine?. At the end of the exhaust stroke and the beginning of the intake stroke. At the beginning of the exhaust stroke and the beginning of the intake stroke. At the end of the intake stroke and the beginning of the exhaust stroke. At the end of the exhaust stroke and the end of the intake stroke.

22. By use of a differential pressure compression tester, it is determined that the #3 cylinder of a nine cylinder radial engine will not hold pressure after the crankshaft has been rotated 260° from TDC compression stroke #1 cylinder, how can this indication usually be interpreted?. Dead cylinder. High oil consumption. Normal conditions. High fuel consumption.

23. What is the best indication of worn valve guides?. High air consumption. High fuel consumption. High oil consumption. High fuel/air consumption.

24. During ground check an engine is found to be rough running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM, the trouble maybe caused by?. It is a normal conditions. A dead cylinder. Slight drip in RPM. Dead cylinder unbalanced.

25. If the ignition switch is moved from both to either left or right during an engine ground check, normal operations is usually indicated by a?. Slight drop in RPM. Slight drop on RPM. Slight drip in PSI. Slight drip on PSI.

26. Standard aircraft cylinder oversize usually ranges from 0.010 inch to 0.030 inch, this is because aircraft engine cylinder?. Have relatively wide walls and maybe nitrided. Have relatively big walls and maybe nitrided. Have relatively thick walls and maybe nitrided. Have relatively thin walls and maybe nitrided.

27. Engine operating flexibility is the ability of the engine to?. Running smoothly and give the desired performance at all speed. Running smoothly. Give the desired performance at all speed. Running smoothly and give the desired performance at high speed.

28. The horsepower developed in the cylinder of a reciprocating engine is. Sensor horsepower. Horsepower. Indicated horsepower. Exhaust horsepower.

29. If an engine cylinder is to be removed, a what position in the cylinder should the piston be?. Middle dead center. Bottom dead center. Top dead center.

30. Which fuel/air mixture will result in the highest engine temperature?. A mixture leaner than a manual lean mixture of 0.100. A mixture leaner than a manual lean mixture of 0.60. A mixture leaner than a manual lean mixture of 0.15. A mixture leaner than a manual lean mixture of 0.80.

31. If an engine operates with a low oil pressure and a high oil temperature, the problem maybe caused by?. Leaking oil dilution valve. Oil dilution valve. Excessive oil level. Low oil level.

32. The oil pressure of a cold engine is higher than a normal operating temperature?. Engine's lubrication system is probably operating only the pressure system. Engine's lubrication system is probably operating abnormal. Engine's lubrication system is probably operating normal. Engine's lubrication system is probably operating with low oil level.

33. A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates?. Exhaust valve blow-by. Intake valve blow-by. Compression valve blow-by. Exhaust piston valve blow-by.

34. An engine misses on both the right and left position of the magneto switch, the quickest method for locating the trouble is to?. Piston cylinder check. Cylinder check. Cold cylinder check. Hot cylinder check.

35. Before attempting to start a radial engine that has been shut down for more than thirty minutes we needed?. Turn the propeller hy hand one or four revolution in the normal direction of rotation to check for liquid lock. Turn the propeller hy hand three to four revolution in the normal direction of rotation to check for liquid lock. Turn the propeller hy hand three to four revolution in the opposite direction of rotation to check for liquid lock. Turn the propeller hy engine three to four revolution in the normal direction of rotation to check for liquid lock.

36. Engine crankshaft runout is usually checked?. Before propeller strike or sudden speed reduction. Before propeller strike speed increase. Before propeller strike or sudden speed increase. After propeller strike or sudden speed reduction.

37. At what speed must a crankshaft turn if each cylinder of a four stroke cycle engine is to be fired 200 times a minute?. 400 RPM. 200 RPM. 800 RPM. 100 RPM.

38. What does valve overlap promote?. Decrease scavenging and cooling characteristics. Better scavenging characteristics. Better scavenging and cooling characteristics. Better cooling characteristics.

39. Excessive valve clearance will cause the duration of valve opening to?. Increase for both intake and exhaust valve. Decrease for intake valve. Decrease for both intake and exhaust valve. Decrease for exhaust valve.

40. What is the most likely to occur if an aircraft reciprocating engine is operated with excessive valve clearance?. the valve will remain open for longer periods than specific by the engine manufacturer. the valve will remain closed for longer periods than specific by the engine manufacturer. the valve will remain close for shorter periods than specific by the engine manufacturer. The valve will remain close for longer periods than specific by the engine owner.

41. What special procedure must be followed when adjusting the valve of an engine equipped with floating cam ring?. Eliminate cam bearing clearance when making valve adjustment. Making valve adjustment. Eliminate cam bearing clearance. normal procedure.

42. If the oil pressure gauge fluctuates over a wide range from zero to normal operations pressure, the most likely cause is?. Oil low level. lack of oil. Oil leak. Low oil supply.

43. If metallic particles are found in the oil filter during an inspection?. It is a normal conditions. The cause should be identified and corrected after the aircraft is released for flight. The cause should be identified and corrected before the aircraft is released for flight. The cause should be identified only.

44. A characteristic of dyna-focal engine mounts as applied to aircraft reciprocating engine is that the?. Shock mounts point backwards the engine center of gravity. Shock mounts point forward the engine center of gravity. Shock mounts point toward the engine center of gravity. Shock mounts point toward the engine center of pressure.

45. During routine inspection of a reciprocating engine, a deposit of small, bright, metallic particles which do not cling to the magnetic drain plug is discovered in the oil sump and on the surface of the oil filter, this condition is?. Maybe a result of abnormal plain type bearing wear and is cause for further investigation. Maybe a result of abnormal plain type piston wear and is cause for further investigation. Maybe a result of normal plain type bearing wear and is not cause for further investigation.

46. Excessive valve clearance results in the valve opening?. Late and closing late. Closing early. Late and closing early. Closing late.

47. As the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would a movement of the propeller in the direction of an engine rotation indicate?. The piston was positioned forward TDC. The piston was positioned past TDC. The piston was positioned backward TDC. The piston doesn't change position.

48. After spark plug from a opposed engine have been serviced, in what position should they be reinstalled?. Next in firing order to the one for which they were removed and swapped top to behind. Next in firing order to the one for which they were removed and swapped top to bottom. Next in firing order to the one for which they were removed and swapped forward to bottom. In the same position it is was removed.

49. What is required by FAR 43 appendix D, when performing an annual 100 Hrs inspection on a reciprocating engine aircraft?. Cylinder compression check. Cylinder strength check. Cylinder pressure check. Engine run up.

50. Why does the smoothness of operation of an engine increase with a greater number of cylinder?. The power impulses are spaced closer together. The power impulses are spaced open together. Damage engine. Misaligned.

51. Which of the following would indicate generally weak engine conditions when operating with a fixed pitch propeller or test club?. High than normal static RPM, full throttle operations. Full throttle operations. Lower than normal static RPM. Lower than normal static RPM, full throttle operations.

52. The floating control thermostat, used on some reciprocating engine installation, helps regulate oil temperature by?. The compressors. Controlling the thermostats. Controlling airflow through the oil cooler. Controlling airflow through the fuel cooler.

53. Which of the following will be caused by excessive valve clearance of a cylinder on a reciprocating aircraft engine?. Increase valve overlap gap. Reduce valve overlap gap. Increase valve overlap period. Reduce valve overlap period.

54. What will be the likely result if the piston rings gaps happen to be aligned when performing a differential pressure compression check on a cylinder?. Low pressure. High pressure. A worn or defective rings indication. A worn or defective piston indication.

55. What is the purpose of a power check on a reciprocating engine?. Leak check. Determine satisfactory performance. Verify the gap. Avoid vibration.

56. When cleaning aluminum and magnesium engine parts, it is inadvisable to soap them in solution containing soap because?. Some of the soap will become impregnated in the surface of the material and cause engine oil contamination and foaming. Not any damage occurs. Soap will become impregnated in the surface of the material and rise with water to clean the soap. Cause engine oil contamination and foaming.

57. The volume of a cylinder equals 70 cubic inches when the piston is BDC, when the piston is at the top of the cylinder, the volume equals 10 cubic inches, what is the compression ratio?. 7:0.1. 1:7. 0.1:7. 7:1.

58. How is proper end gap clearance on new piston rings assured during the overhaul of an engine?. By placing the ring in the cylinder and measuring the forward gap with the filler gauge. According to the manufacturer manual. By placing the ring in the cylinder and measuring the end gap with the filler gauge. It is not necessary measure the gap.

59. 1. Cast iron piston rings may be used in chrome plated cylinder. 2. Chrome plated rings may be used in plain steel cylinder. Regarding the above statements?. Only No 2 is true. Only No 1 is true. Both are true. Both are wrong.

60. If the crankshaft runout readings on the dial indicator are plus .002 inch and minus .003 inch, the runout is?. -0.005". -0.001". 0.0010". 0.005".

61. Compression ratio is the ratio between the?. Cylinder volume with piston at bottom dead center and at top dead center. Cylinder area with piston at bottom dead center and at top dead center. Cylinder volume with piston at bottom dead center and at middle dead center. Cylinder volume with piston intake and piston exhaust.

62. During overhaul, the disassembled part of and engine are usually degreased with some form of mineral spirits solvent rather than water-mixed degreaser primarily because?. Is the best way to degreaser the engine. The degreaser eliminate valve float or valve surge. Water mixed degreaser residues may cause engine oil contamination in the piston. Water mixed degreaser residues may cause engine oil contamination in the overhauled engine.

63. The purpose of two or more valve springs in the aircraft engine is to?. Eliminate valve float or valve surge. Eliminate valve float and valve surge. Eliminate valve fixed or valve ring. Eliminate only valve float or the half ofthe valve surge.

64. If the hot clearance is used to set the valve when the engine is cold, what will occur during operation of the engine?. Not affect the operation of the engine. Valves will open early and close late. Valves will open late and close early. Valves will open late and close late.

65. The primary purpose in setting proper valve timing and over lap is to?. Obtain the best volumetric efficiency and lower cylinder operating temperature. Obtain the best performance in the engine. Get the piston and the small end offthe connection rod. Obtain a high volumetric efficiency and lower cylinder operating temperature.

66. Full floating piston pins are those which allow motions between the pin and?. The piston and the small end of the connection rod. The piston and the small end of the connection tensor. The small end ofthe connection rod. The piston rings.

67. How many of the following are factors in establishing the maximum compression ratio limitations of an aircraft engine?. Detonation characteristics of the fuel used - Degree of supercharging - Designed limitations of the exhaust. Design limitation of the intake - Degree of supercharging - Detonation characteristics of the fuel used. Detonation caracteristics of the fuel used - Design limitation of the engine. Detonation characteristics of the fuel used - Design limitation of the engine - Degree of supercharging.

68. How does a dual axial-flow compressor improve the efficiency of a turbojet engine. Higher compression ratios can be obtained. More turbine wheels can be used. Combustion chamber temperatures are reduced. The velocity of the air entering the combustion chambers is increased.

69. What are the main sections of a turbojet engine ?. Compressor, combustion and difusor. Inlet, combustion and turbine. Fan, combustion and exhaust. Compressor, combustion and turbine.

70. How is the turbine shaft usually joined to the compressor rotor of a centrifugal compressor turbine engine?. Bolted coupling. Keyed coupling. Welded coupling. Splined coupling.

71. The fan rotational speed of a dual axial compressor forward fan engine is the same as. low-pressure compressor. accessory drive shaft. forward turbine wheel. high-pressure compressor.

72. Two basic types of turbine blades are: impulse and reaction. reaction and converging. impulse and vector. tangential and reaction.

73. What is the profile of a turbine engine compressor blade?. The shape ofthe blade root at the disk attachment. A cutout that reduces blade tip thickness. The leading edge of the blade. The curvature of the blade root.

74. Damage to turbine vanes is apt to be greater than damage to compressor vanes because turbine vanes are subject to much greater. heat stress. stress in the combustor. thrust elearance. vibration and other stresses.

75. A turbine engine hot section is particularly susceptible to which of the following kind of damage?. Cracking. Pitting. Scoring. Galling.

76. When aircraft turbine blades are subject to excessive temperatures, what types of failures would you expect ?. Stress rupture. Compression and torsion. Bending and torsion. Torsion and tension.

77. Severe rubbing of turbine engine compressor blades will usually cause. bowing. cracking. galling. burning.

78. Turbojet engine turbine blades removed for detailed inspection must be reinstalled in. a slot 90 degrees clockwise. a slot 180 degrees away. the same slot. a slot 90 degrees counter-clockwise.

79. The turbines near the rear of a jet engine. drive the compressor section. circulate air to cool the engine. increase air velocity for propulsion. compress air heated in the combustion section.

80. Which of the following are the most common types of thrust reversers used on turbine engine powered aircraft ?. Mechanical-blockage and aerodynamic blockage. Cascade vane and blocked door. Convergent and divergent. Rotary air vane and stationary air vane.

81. Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?. Compressor inlet temperature and aireraft speed. Throttle position and fuel temperature. Burner pressure and exhaust gas temperature. Engine speed and mixture control position.

82. Which of the following is NOT a factor in the operation of an automatic fuel control unit used an a turbojet engine ?. Mixture control position. Compressor inlet air density. Throttle position. Compressor rpm.

83. When starting a turbojet engine. an excessively lean mixture is likely to cause a hot start. the engine should start between 60 and 80 seconds after the fuel shut off lever is opened. release the starter switch as soon as indication of light off occurs. a hot start is indicated if the exhaust gas temperature exceeds specified limits.

84. Where is water injected into a turbojet engine for cooling purposes?. Compressor air inlet or diffuser. Burner can. Fuel control. Second-stage compressor or turbine.

85. What is the rotational speed of the camshaft in a horizontally opposed engine in relation to the crankshaft. 1/8 crankshaft speed. 1/4 crankshaft speed. 1/2 crankshaft speed. Same as crankshaft speed.

86. Which of the following engine servicing operations generally requires engine pre-oiling prior to start the engine?. Engine installation. Oil filter change. Engine oil change. Replacement of oil lines.

87. How may it be determined that a reciprocating engine with a dry sump is pre-oiled sufficiently?. Oil will appear on the cylinder interior walls. The engine oil pressure gage will indicate normal oil pressure. When the quantity of oil specified by the manufacturer has been pumped into the engine. Oil will flow from the engine return line or indicator port.

88. Before attempting to start a radial engine that has been shut down for more than 30 minutes. place carburetor air control in "hot" position to prevent damage and fire in case of backfire. pull the propeller through by hand in the opposite direction of normal rotation to check for liquid lock. turn the ignition switch on before energizing the starter. turn the propeller 3 or 4 revolutions in the normal direction of rotation to check for liquid lock.

89. Low oil supply is indicated by. a chattering relief valve spring. oil pressure gage fluctuates from zero to normal operating pressure. malfunction of the thermostatic control valve. air lock in the seavenger pump inlet.

90. If the oil pressure gauge fluctuates over a wide range, from zero to normal operating pressure, the most likely cause is?. Low oil supply. Broken or weak pressure relief valve spring. Air lock in the scavenger pump inlet. Malfunction of the thermostatic control valve.