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AMP Aviation Maintenance Technician
Powerplant EXAM 83 Questions and Answers
Latest Update
Which type of bearings are generally used for connecting rods and cam shafts? A. Plain. B. Roller. C. Ball. - ** A. Plain. The five events of a four-stroke cycle engine in the order of their occurrence are: A. intake, ignition, compression, power, and exhaust. B. intake, compression, power, ignition, and exhaust. C. intake, compression, ignition, power, and exhaust. - ** C. Intake, compression, ignition, power, exhaust What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up? A. Oil starvation of bearings and other parts. B. Excessive engine oil pressure. C. Thermal shock of cylinders. - ** A. Oil starvation of bearings and other parts During the inspection of an engine control system in which push pull control rods are used, the threaded rod ends should: A. ensure that the safety wire passes through the hole in the shank of the rod end. B. be checked for thread engagement of at least two threads but not more than four threads.
C. be checked for the amount of thread engagement by means of the inspection holes. - ** C. be checked for the amount of thread engagement by means of the inspection holes. If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a slight A.increase in manifold pressure. B. bump in propeller rpm. C. drop in torque meter pressure indication. - ** B. bump in propeller rpm. Some cylinder barrels are hardened by: A. nitriding. B. honing. C. quenching. - ** A. nitriding What is the purpose of installing two or more springs on each valve in an aircraft engine? A. To equalize side pressure on the valve stem. B. To eliminate valve spring vibration or surging. C. To help equalize valve face loading. - ** B. To eliminate valve spring vibration or surging. The volume of a cylinder equals 70 cubic inches when the piston is at bottom center. When the piston is at the top of the cylinder, the volume equals 10 cubic inches. What is the compression ratio? A. 10: B. 10: C. 7:1 -
What is the first engine instrument indication of a successful start of a turbine engine? A. A rise in engine rpm. B. A rise in oil temperature. C. A rise in the exhaust gas temperature. - ** C. A rise in the exhaust gas temperature. When starting a turbine engine, a hung start is indicated if the engine A. exhaust gas temperature exceeds specified limits. B. fails to reach idle rpm. C. N1 is normal, but N2 is low. - ** A. exhaust gas temperature exceeds specified limits. Turbine blades are generally more susceptible to operating damage than compressor blades because of A. the high probability of carbon deposits. B. exposure to high temperatures. C. less exposure to solution during engine pressure wash. - ** B. exposure to high temperatures. The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine are called: A. rotor blades. B. stator vanes. C. disc rims. - ** B. stator vanes. A turbine engine hot section is particularly susceptible to which kind of damage?
A. Erosion. B. Cracking. C. Elongation. - ** B. Cracking Which of the following acts as a diffuser in a turbine engine and converts velocity to pressure? A. Impeller. B. Manifold. C. Stators. - ** C. Strators How is the flow range of the fuel discharge nozzles installed in a fuel injected reciprocating engine indicated? A. By a letter stamped on the hex of the nozzle body. B. By a number stamped on the hex of the nozzle body. C. By the code located on the engine data plate. - ** B. By a number stamped on the hex of the nozzle body. What publication is used for guidance to determine whether a powerplant repair is major or minor? A. Airworthiness Directives B. 14 CFR Part 43 C. Aircraft Owner`s Manual - ** B. 14 CFR Part 43 Which of the following instrument conditions is acceptable and does not require immediate correction? A. Case paint chipped.
B. When the yellow indicator disk is missing, it indicates the fire extinguishing system has been normally discharged. C. When the green indicator disk is missing, it indicates that the fire extinguishing system may have been normally discharged. - ** B. When the yellow indicator disk is missing, it indicates the fire extinguishing system has been normally discharged. Refer to FAA-CT-8080-4G, Appendix 2, Figure 3.) What are the fire-extinguisher container pressure limits when the temperature is 50°F? A. 425 - 575 PSIG. B. 435 - 605 PSIG. C. 475 - 625 PSIG. - ** C. 475 - 625 PSIG. Which of the following fire detection systems are commonly used in an engine nacelle? A. Fire detection control unit. B. Thermocouple detector. C. Kidde continous-loop. - ** C. Kidde continous-loop.
- What is used to polish commutators or slip rings? A. Double-0 sandpaper. B. Stiff bristle brushes. C. Emery cloths. - ** A. Double-0 sandpaper. When installing electrical wiring parallel to a fuel line, the wiring should be
A. below the fuel line. B. beside the fuel line. C. above the fuel line. - ** C. above the fuel line The reason for flashing the field in a generator is to A. restore residual magnetism to the field frame. B. ensure proper operation of the capacitor. C. relieve the unit of any residual electrical energy. - ** A. restore residual magnetism to the field frame. A term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is A. strapping. B. piggy backing. C. stacking. - ** C. stacking. Aircraft wire size is determined by using a(n) A. ohmeter. B. wire gauge. C. dial caliper. - ** B. wire gauge. Starter brushes should be replaced when they are worn down to A. one-half of the original length.
In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output A. increases as the resistance offered to the flow of oil increases with more oil being returned to the pump inlet by the relief valve. B. remains relatively constant (at a given rpm) with less oil being returned to the pump inlet by the relief valve. C. remains relatively constant (at a given rpm) with more oil being returned to the pump inlet by the relief valve. - ** B. remains relatively constant (at a given rpm) with less oil being returned to the pump inlet by the relief valve. Which of the following prevents oil from entering the main accessory case when the engine is not running? A. Pressure valve. B. Hydraulic fuse. C. Check valve. - ** C. Check valve. Which of the following factors has the least effect on the oil consumption of a specific engine? A. Mechanical efficiency. B. Engine rpm. C. Lubricant characteristics. - ** A. Mechanical efficiency. If an oil filter element becomes completely clogged, the A. oil flow to the engine will be restricted.
B. oil will be bypassed back to the oil tank. C. bypass valve will open, and the oil pump will supply unfiltered oil. - ** C. bypass valve will open, and the oil pump will supply unfiltered oil. Which of the following are distinct circuits of a high tension magneto? A. Magnetic, primary, and secondary. B. Magnetic, E-gap, and P lead. C. Primary, P lead, and secondary. - ** A. Magnetic, primary, and secondary. Advantages of dual ignition in aircraft engines include providing a backup magneto system, increasing the output power of the engine, and A. permitting the use of lower grade fuels. B. increasing the intensity of the spark at the spark plugs. C. increasing the output power of the engine. - ** A. permitting the use of lower grade fuels. Defective spark plugs will cause the engine to run rough A. during run up. B. during cruise. C. at all speeds. - ** C. at all speeds. The primary advantage of pneumatic (air turbine) starters over comparable electric starters for turbine engines is A. a significant lack of wear to the commutator.
C. At the rectifier. - ** B. At the triggering transformer. Igniter plugs used in turbine engines have a long service life because they A. have a high intensity spark. B. operate continuously with a lower spark. C. do not require continuous operation. - ** C. do not require continuous operation. When a magneto is operating, what is the probable cause for a shift in internal timing? A. The rotating magnet loses its magnetism. B. The distributor gear teeth are wearing on the rotor gear teeth. C. The cam follower wear and/or the breaker points wear. - ** C. The cam follower wear and/or the breaker points wear. The magnetic circuit of a magneto consists of a permanent multi-pole rotating magnet. The core is made of A. hard steel. B. soft iron. C. electrical steel. - ** B. soft iron. When troubleshooting an engine that will not idle, what would be a probable cause? A. Economizer valve is not operating correctly. B. Mixture setting is too rich. C. Manifold valve is not operating properly. - ** A. Economizer valve is not operating correctly.
What carburetor component limits the maximum airflow into the engine at full throttle? A. Throttle valve. B. Venturi. C. Main metering jet. - ** B. Venturi. What component is used to ensure fuel delivery during periods of rapid engine acceleration? A. Acceleration pump. B. Engine-driven fuel pump. C. Power enrichment unit. - ** A. Acceleration pump. If fuel is found running from the carburetor with the engine not running, the likely cause is that the A. float needle valve is not seated properly. B. float level is adjusted too low. C. main air bleed is clogged. - ** A. float needle valve is not seated properly. What corrective action should be taken when a carburetor is found to be leaking fuel from the discharge nozzle? A. Replace the needle valve and seat. B. Adjust the mixture control. C. Adjust throttle linkage. - ** A. Replace the needle valve and seat. The primary purpose of the air bleed openings used with continuous flow fuel injector nozzles is to
C. obtain a true temperature reading comparable to that of the air that enters the engine. - ** C. obtain a true temperature reading comparable to that of the air that enters the engine. Where is the main fuel strainer located in the aircraft fuel system? A. At the highest point in the fuel system. B. At the lowest point in the fuel system. C. At the inlet chamber of the carburetor. - ** B. At the lowest point in the fuel system. Which of the following is a function of the differential pressure controller? A. It limits the maximum manifold pressure that can be produced by the turbocharger at full throttle conditions. B. It controls all positions of the waste gate except at fully open position. C. It controls the position of the waste gate after the aircraft has reached its critical altitude. - ** B. It controls all positions of the waste gate except at fully open position. A method commonly used to prevent carburetor icing is to A. preheat the intake air. B. mix alcohol with the fuel. C. electrically heat the throttle valve. - ** A. preheat the intake air.
If a fire starts in the induction system during the engine starting procedure, what should the operator do? A. Turn off the fuel pump switches. B. Continue cranking the engine. C. Turn off the magneto switches. - ** B. Continue cranking the engine. The position of the cowl flaps during normal cruise flight conditions is A. closed. B. open. C. neutral. - ** A. closed. Cracks in cooling fins that do not extend into the cylinder head A. should be left alone and monitored. B. may be repaired by removing the affected area and contour filing within limits. C. may be repaired by adding a stiffener. - ** B. may be repaired by removing the affected area and contour filing within limits. A bent cooling fin on an aluminum cylinder head should be A. sawed off and filed smooth.
C. high oil consumption. - ** A. excessive exhaust back pressure. The pressure between the turbocharger and the throttle valve is called A. turbocharger boost pressure. B. induction manifold pressure. C. upper deck pressure. - ** C. upper deck pressure. Propellers exposed to salt spray should be flushed with A. engine oil. B. fresh water. C. soapy water. - ** B. fresh water. Inspection of aluminum propeller blades by dye-penetrant inspection is accomplished to detect A. fatigue failure. B. material debond. C. warpage. - ** A. fatigue failure.
Propeller blade station numbers increase from A. hub center line to tip. B. tip to hub center line. C. blade shank butt to tip. - ** A. hub center line to tip. Which of the following determines oil and grease specifications for lubrication of propellers? A. Lubricant manufacturers instructions. B. Engine manufacturers instructions. C. Propeller manufacturers instructions. - ** C. Propeller manufacturers instructions. Ice formation on a propeller blade will A. produce unbalance and vibration. B. increase thrust and drag. C. cause a change in blade angle. - ** A. produce unbalance and vibration. How is anti-icing fluid ejected from the slinger ring on a propeller? A. By pump pressure.
