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ERASED TEST, YOU MAY BE INTERESTED ONFAA AMT POWERPLANT QUESTIONS 12

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Title of test:
FAA AMT POWERPLANT QUESTIONS 12

Description:
faa study guide

Author:
fabio santos
(Other tests from this author)

Creation Date:
12/04/2017

Category:
Others

Number of questions: 40
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Content:
The purpose of a bleed valve, located in the beginning stages of the compressor, in an aircraft gas turbine engine is to: vent some of the air overboard to prevent a compressor stall. control excessively high RPM to prevent a compressor stall. vent high ram air pressure overboard to prevent a compressor stall.
An indication that the optimum idle mixture has been obtained occurs when the mixture control is moved to IDLE CUTOFF and manifold pressure: decreases momentarily and RPM drops slightly before the engine ceases to fire. decreases and RPM increases momentarily before the engine ceases to fire. increases momentarily and RPM drops slightly before the engine ceases to fire.
In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the pressure pump. scavenger pump. oil temperature regulator.
A carburetor is prevented from leaning out during quick acceleration by the: power enrichment system. accelerating system. mixture control system.
What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used? Fuel specific gravity setting. Maximum RPM adjustment. EPR gauge calibration.
The fuel flow indicator rotor and needle for a motor impeller and turbine indicating system is driven by: an electrical signal. direct coupling to the motor shaft. a mechanical gear train.
When a "Shower of Sparks" ignition system is activated at an engine start, a spark plug fires: only while both the retard and advance breaker points are closed. as soon as the advance breaker points open. only while both the retard and advance breaker points are open.
In a four stroke cycle aircraft engine, when does the ignition event take place? After the piston reaches TDC on compression stroke. After the piston reaches TDC on power stroke. Before the piston reaches TDC on compression stroke.
What type of oil system is usually found on turbine engines? Wet sump, spray, and splash. Dry sump, pressure, and spray. Dry sump, dip, and splash.
A ground incident that results in propeller sudden stoppage would require a crankshaft runout inspection. What publication would be used to obtain crankshaft runout tolerance? AC 43.13-1A, Acceptable Methods, Techniques, and Practices Aircraft Inspection and Repair. Type Certificate Data Sheet. Current manufacturer's maintenance instructions.
A pilot reports that the fuel pressure fluctuates and exceeds the upper limits whenever the throttle is advanced. The most likely cause of the trouble is: a sticking fuel pump relief valve. an air leak at the fuel pump relief valve body. a ruptured fuel pump relief valve diaphragm.
Which of the following causes a single diaphragm accelerator pump to discharge fuel? An increase in manifold pressure that occurs when the throttle valve is opened. A decrease in manifold pressure that occurs when the throttle valve is opened. An increase in venturi suction when the throttle valve is open.
What instrument indicates the thrust of a gas turbine engine? Exhaust gas temperature indicator. Engine pressure ratio indicator. Turbine inlet temperature indicator.
Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as: balanced type relief valves. pressurized relief valves. compensated flow valves.
Prolonged idling of an engine will usually result in: increased oil consumption. excessive cylinder head temperatures. foreign material buildup on spark plugs.
What is the operating principle of the spot detector sensor in a fire detection system? A conventional thermocouple that produces a current flow. A bimetallic thermoswitch that closes when heated to a high temperature. Resistant core material that prevents current flow at normal temperatures.
A reciprocating engine automatic mixture control responds to changes in air density caused by changes in: altitude or humidity. altitude only. altitude or temperature.
Oil picks up the most heat from which of the following turbine engine components? Compressor bearing. Turbine bearing. Rotor coupling.
If an engine equipped with a float type carburetor backfires or misses when the throttle is advanced, a likely cause is that the: main air bleed is clogged. accelerating pump is not operating properly. float level is too high.
Detonation occurs when the fuel/air mixture: ignites before the time of normal ignition. is too rich. burns too fast.
During which of the following conditions of flight will the blade pitch angle of a constant speed propeller be the greatest? Approach to landing. High speed, high altitude cruising flight. Climb following takeoff.
(1) Some aircraft exhaust systems include an augmenter system to draw additional air over the engine for cooling. (2) Augmenter systems are used to create a low pressure area at the lower rear of the aircraft engine cowling. Regarding the above statements, both No. 1 and No. 2 are true. only No. 2 is true. only No. 1 is true.
On an engine equipped with a pressure type carburetor, fuel supply in the idling range is ensured by the inclusion in the carburetor of: an idle metering jet that bypasses the carburetor in the idle range. a separate boost venturi that is sensitive to the reduced airflow at start and idle speeds. a spring in the unmetered fuel chamber to supplement the action of normal metering forces.
Oil accumulation in the cylinders of an inverted in line engine and in the lower cylinders of a radial engine is normally reduced or prevented by: reversed oil control rings. routing the valve operating mechanism lubricating oil to a separate scavenger pump. extended cylinder skirts.
The fuel metering force of a conventional float type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the venturi and the pressure: acting on the fuel in the float chamber. of the fuel as it enters the carburetor. of the air as it enters the venturi (impact pressure).
Ignition check during engine runup indicates excessive RPM drop during operation on the right magneto. The major portion of the RPM loss occurs rapidly after switching to the right magneto position (fast drop). The most likely cause is: incorrect ignition timing on both magnetos. faulty or fouled spark plugs. one or more dead cylinders.
Which of the following statements most accurately describes spark plug heat range? The length of the threaded portion of the shell usually denotes the spark plug heat range. A hot plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the spark plug shell to the cylinder head. A cold plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the spark plug shell to the cylinder head.
The centrifugal twisting force acting on a propeller blade is: greater than the aerodynamic twisting force and tends to move the blade to a higher angle. less than the aerodynamic twisting force and tends to move the blade to a lower angle. greater than the aerodynamic twisting force and tends to move the blade to a lower angle.
Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of: oil at a specific temperature. mercury at a specific temperature. distilled water at a specific temperature.
In a reciprocating engine oil system, the temperature bulb senses oil temperature: at a point after the oil has passed through the oil cooler. immediately before the oil enters the oil cooler. while the oil is in the hottest area of the engine.
The fuel flowmeter used with a continuous-fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across the: metering valve. manifold valve. fuel nozzles.
Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances? The valves will remain closed for longer periods than specified by the engine manufacturer. The valves will not seat positively during start and engine warmup. The further decrease in valve clearance that occurs as engine temperatures increase will cause damage to the valve-operating mechanism.
The undersides of pistons are frequently finned. The principal reason is to: support ring grooves and piston pins. provide sludge chambers and sediment traps. provide for greater heat transfer to the engine oil.
The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to: force cooling air into close contact with all parts of the cylinders. increase the volume of air used to cool the engine. create a low pressure area aft of the cylinders.
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. 2 and 3. 1, 2, and 3. 1 and 2.
The constant current method of charging a ni-cad battery: is the method most effective in maintaining cell balance. will lead to cell imbalance over a period of time. will bring it up to fully charged in the shortest amount of time.
According to Federal Aviation Regulations, oil tank fillers on turbine engines must be marked with the word: oil and the type and grade of oil specified by the manufacturer. oil and tank capacity. oil.
What is the relationship between distributor and crankshaft speed of aircraft reciprocating engines? The crankshaft turns at one half distributor speed. The distributor turns at one half crankshaft speed. The distributor turns at one and one half crankshaft speed.
PROPELLER BLADE TRACKING IS THE PROCESS OF DETERMINING: the plane of rotation of the propeller with respect to the aircraft longitudinal axis that the blade angles are within the specified tolerance of each other the positions of the tips of the propeller blades relative to each other.
A SPARK PLUG'S HEAT RANGE IS THE RESULT OF: the heat intensity of the spark its ability to transfer heat from the firing end of the spark plug to the cylinder head the area of the plug exposed to the cooling airstream.
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