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ERASED TEST, YOU MAY BE INTERESTED ONFAA AMT POWERPLANT QUESTIONS 17

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Title of test:
FAA AMT POWERPLANT QUESTIONS 17

Description:
faa study guide

Author:
fabio santos
(Other tests from this author)

Creation Date:
30/04/2017

Category:
Others

Number of questions: 40
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Content:
Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to: prevent overservicing. provide a better indication of any oil leaks in the system. help dilute and neutralize any contaminants that may already be present in the engine's oil system.
When must an Airworthiness Directive (AD) be complied with after it becomes effective? During the next scheduled inspection. At the next scheduled overhaul. As specified in the AD.
What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods? The oil becomes diluted with gasoline washing past the pistons into the crankcase. The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles. Exposure to heat and oxygen causes a decreased ability to maintain a film under load.
What turbine engine section provides for proper mixing of the fuel and air? Compressor section. Diffuser section. Combustion section.
When a magneto is operating, what is the probable cause for a shift in internal timing: The cam follower wear and/or the breaker points wear. The rotating magnet looses its magnetism. The distributor gear teeth are wearing on the rotor gear teeth.
The application of carburetor heat during engine operation will: decrease the weight of the fuel/air charge. decrease the volume of air in the cylinder. increase the density of air in the cylinder.
Great caution should be exercised in handling damaged hermetically sealed turbine engine igniter transformer units because: some contain toxic chemicals. compounds in the unit may become a fire or explosion hazard when exposed to the air. some contain radioactive material.
The holding coil on a hydromatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller: feathering pump motor. governor. dome feathering mechanism.
One of the best ways to increase engine power and control detonation and preignition is to: enrich the fuel/air mixture. use water injection. lean the fuel/air mixture.
What is the basic purpose of the three small holes (No. 60 drill) in the tipping of wood propeller blades? To provide a means for inserting balancing shot when necessary. To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping). To provide a means for periodically impregnating the blade with preservation materials.
The fuel level within the float chamber of a properly adjusted float type carburetor will be: at the same level as the discharge nozzle outlet. slightly higher than the discharge nozzle outlet. slightly lower than the discharge nozzle outlet.
(1) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced. (2) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency. Regarding the above statements, both No. 1 and No. 2 are true. only No. 2 is true. only No. 1 is true.
What likely effect would a cracked distributor rotor have on a magneto? Ground the primary circuit through the crack. Ground the secondary circuit through the crack. Fire two cylinders simultaneously.
Which of the following is used to correct horizontal unbalance of a wood propeller? Solder. Brass screws. Shellac.
Which of the following would most likely cause a reciprocating engine to backfire through the induction system at low RPM operation? Clogged derichment valve. Lean mixture. Idle mixture too rich.
The purpose of a bellmouth compressor inlet is to: maximize the aerodynamic efficiency of the inlet. provide an increased ram air effect at low airspeeds. provide an increased pressure drop in the inlet.
How is a propeller controlled in a large aircraft with a turboprop installation? Independently of the engine. By the engine power lever. By varying the engine RPM except for feathering and reversing.
A constant speed propeller provides maximum efficiency by: increasing blade pitch as the aircraft speed decreases. adjusting blade angle for most conditions encountered in flight. increasing the lift coefficient of the blade.
How are the teeth of the gears in the accessory section of an engine normally lubricated? By splashed or sprayed oil. By submerging the load bearing portions in oil. By surrounding the load bearing portions with baffles or housings within which oil pressure can be maintained.
Valve overlap is defined as the number of degrees of crankshaft travel: during which both valves are on their seats. during which both valves are off their seats. between the closing of the intake valve and the opening of the exhaust valve.
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: increases as the resistance offered to the flow of oil increases. remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve. remains relatively constant (at a given RPM) with more oil being returned to the pump inlet by the relief valve.
Increased engine heat will cause volumetric efficiency to: increase. remain the same. decrease.
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.
When inspecting an aircraft reciprocating engine what document is used to determine if the proper magnetos are installed? Aircraft Engine Specifications or Type Certificate Data Sheets. Engine Manufacturer's Maintenance Manual. Instruction for continued airworthiness issued by the engine manufacturer.
In order to turn a magneto off, the primary circuit must be: shorted. opened. grounded.
How are the rotor windings of an aircraft alternator usually excited? By a variable direct current. By a constant ac voltage. By a constant ac voltage from the battery.
Carburetor icing is most severe at: high altitudes. air temperatures between 30 and 40 °F. low engine temperatures.
Which of these characteristics is desirable in turbine engine oil? Low flash point. High volatility. High flash point.
Which condition would be the least likely to be caused by failed or failing engine bearings? High oil temperatures. Excessive oil consumption. Low oil temperatures.
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.
If the turbocharger waste gate is completely closed, none of the exhaust gases are directed through the turbine. the turbocharger is in the OFF position. all the exhaust gases are directed through the turbine.
In turbine engines that utilize a pressurization and dump valve, the dump portion of the valve: dumps extra fuel into the engine in order to provide for quick engine acceleration during rapid throttle advancement. drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown). cuts off fuel flow to the engine fuel manifold and dumps the manifold fuel into the combustor to burn just before the engine shuts down.
The blade angle of a fixed pitch propeller: increases in proportion to the distance each section is from the hub. is greatest at the tip. is smallest at the tip.
If the oil pressure of a cold engine is higher than at normal operating temperatures, the: oil dilution system should be turned on immediately. oil system relief valve should be readjusted. engine's lubrication system is probably operating normally.
When will small induction system air leaks have the most noticeable effect on engine operation? At high RPM. At maximum continuous and takeoff power settings. At low RPM.
The density of air is very important when mixing fuel and air to obtain a correct fuel to air ratio. Which of the following weighs the most? 75 parts of dry air and 25 parts of water vapor. 100 parts of dry air. 50 parts of dry air and 50 parts of water vapor.
Severe rubbing of turbine engine compressor blades will usually cause: bowing. galling. cracking.
Cam ground pistons are installed in some aircraft engines to: equalize the wear on all pistons. provide a better fit at operating temperatures. act as a compensating feature so that a compensated magneto is not required.
Which of the following breaker point characteristics is associated with a faulty capacitor? Coarse grained. Fine grained. Crowned.
The oil used in reciprocating engines has a relatively high viscosity due to: large clearances and high operating temperatures. the relatively high rotational speeds. the reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure).
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