On a reciprocating engine aircraft using a shrouded exhaust muffler system as a source for cabin heat, the exhaust system should be:
visually inspected for any indication of cracks or an operational carbon monoxide detection test should be done. replaced at each reciprocating engine overhaul by a new or overhauled exhaust system or an hydrostatic test should be accomplished. removed and the exhaust muffler checked for cracks by using magnetic particle inspection method or an hydrostatic test should be done on the exhaust muffler.
If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade(s) must be:
reset (blade angle) to compensate for the shortened blade. reduced to conform with the shortened blade. returned to the manufacturer for alteration.
Which type of pump is commonly used as a fuel pump on reciprocating engines?
Gear. Impeller. Vane.
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.
When using a timing light to time a magneto to an aircraft engine, the magneto switch should be placed in the:
OFF position. BOTH position. LEFT or RIGHT position (either one).
How does a dual axial flow compressor improve the efficiency of a turbojet engine? the velocity of the air entering the combustion chamber is increased higher compression ratios can be obtained more turbine wheels can be used.
The E gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position: of greatest magnetic flux density where the contact points open where the contact points close.
The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in: the need for less frequent abrasive grit cleaning of the engine foreign object damage to the compressor section erosion damage to the compressor and turbine sections.
A certain nine cylinder radial engine used a noncompensated single unit, dual type magneto with a four pole rotating magnet and separately mounted distributors. Which of the following will have the lowest RPM at any given engine speed? breaker cam distributors engine crankshaft.
Why is high nickel chromium steel used in many exhaust systems? corrosion resistance and low expansion coefficient high heat conductivity and flexibility corrosion resistance and high heat conductivity.
What are the rotational speed and blade pitch angle requirements of a constant speed propeller during takeoff? high speed and high pitch angle high speed and low pitch angle low speed and high pitch angle.
How are combustion liner walls cooled in a gas turbine engine? by the pattern of holes and louvers cut in the diffuser section by bleed air vented from the engine air inlet by secondary air flowing through the combustion chamber.
What is meant by a double entry centrifugal compressor? a two stage compressor independently connected to the main shaft a compressor with vanes on both sides of the impeller a compressor that has two intakes.
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
a major repair. permitted under the privileges and limitations of a powerplant rating. a major alteration.
What is the purpose of the dump valve used on aircraft gas turbine engines?
Maintains minimum fuel pressure to the engine fuel control unit inlet and dumps excessive fuel back to the inlet of the engine driven fuel pump. The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling as a result of residual engine heat. The valve controls compressor stalls by dumping compressor bleed air from the compressor discharge port under certain conditions.
Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?
Vane with calibrated spring. Bourdon tube. Diaphragm or bellows.
A nine cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of:
1,283 cubic inches. 1,425 cubic inches. 740 cubic inches.
What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down?
Pressurization valve closed, dump valve closed. Pressurization valve closed, dump valve open. Pressurization valve open, dump valve open.
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.
After proper removal of aluminum blade damage, the affected surface should be polished with:
powdered soapstone. very fine sandpaper. fine steel wool.
The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be:
125 percent of the takeoff fuel consumption of the engine. 125 percent of the maximum, except takeoff, fuel consumption of the engine. 150 percent of the takeoff fuel consumption of the engine.
Carburetor icing is most severe at:
high altitudes. air temperatures between 30 and 40 °F. low engine temperatures.
The use of the carburetor air heater when it is not needed causes:
excessive increase in manifold pressure. a decrease in power and possibly detonation. a very lean mixture.
(1) Gas turbine and reciprocating engine oils can be mixed or used interchangeably.
(2) Most gas turbine engine oils are synthetic.
Regarding the above statements, neither No. 1 nor No. 2 is true. only No. 2 is true. both No. 1 and No. 2 are true.
On turbojet powered airplanes, thrust reversers are capable of producing between?
35 and 50 percent of the rated thrust in the reverse direction. 35 and 75 percent of the rated thrust in the reverse direction. 35 and 65 percent of the rated thrust in the reverse direction.
An oil separator is generally associated with which of the following?
Engine driven vacuum pump. Engine driven oil pressure pump. Cuno oil filter.
Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high altitude performance?
Dual stage, centrifugal flow. Single spool, axial flow. Split spool, axial flow.
An engine becomes overheated due to excessive taxiing or improper ground runup. Prior to shutdown, operation must continue until cylinders have cooled, by running engine at:
idle RPM. low RPM with oil dilution system activated. high RPM with mixture control in rich position.
Upon what does the output frequency of an ac generator (alternator) depend?
The speed of rotation and the number of field poles. The speed of rotation and the strength of the field. The speed of rotation, the strength of the field, and the number of field poles.
The spark occurs at the spark plug when the ignition's:
secondary circuit is completed. primary circuit is broken. primary circuit is completed.
The active clearance control (ACC) portion of an EEC system aids turbine engine efficiency by:
adjusting stator vane position according to operating conditions and power requirements. automatically adjusting engine speed to maintain a desired EPR. ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures.
What component is used to ensure fuel delivery during periods of rapid engine acceleration?
Water injection pump. Acceleration pump. Power enrichment unit.
Which of the following breaker point characteristics is associated with a faulty capacitor?
Coarse grained. Fine grained. Crowned.
What is the purpose of the flow divider in a turbine engine duplex fuel nozzle?
Provides a flow path for bleed air which aids in the atomization of fuel. Allows an alternate flow of fuel if the primary flow clogs or is restricted. Creates the primary and secondary fuel supplies.
Most large aircraft reciprocating engines are equipped with which of the following types of engine driven fuel pumps?
Gear type fuel pump. Centrifugal type fuel pump. Rotary vane type fuel pump.
Which statements are true regarding aircraft engine propulsion?
1. An engine driven propeller imparts a relatively small amount of acceleration to a large mass of air.
2. Turbojet and turbofan engines impart a relatively large amount of acceleration to a smaller mass of air.
3. In modern turboprop engines, nearly 50 percent of the exhaust gas energy is extracted by turbines to drive the propeller and compressor with the rest providing exhaust thrust. 1, 2, 3. 1, 3. 1, 2.
If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?
The thinnest oil that will stay in place and maintain a reasonable film strength. An oil that combines a low viscosity index and a high neutralization number. An oil that combines high viscosity and low demulsibility.
Fuel is discharged for idling speeds on a float type carburetor:
in the venturi. through the idle discharge air bleed. from the idle discharge nozzle.
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.
Excessively rich or lean idle mixtures result in:
incomplete combustion. too rapid completion of combustion. incomplete cylinder scavenging.
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