The generating system of an aircraft charges the battery by using:
constant voltage and varying current. constant voltage and constant current. constant current and varying voltage.
A major difference between the Teledyne-Continental and RSA (Precision Airmotive or Bendix) continuous flow fuel injection systems in fuel metering is that the:
Continental system uses fuel pressure only as a metering force. Continental system utilizes airflow as a metering force. RSA system uses air pressure only as a metering force.
Three types of turbine blades are:
impulse, vector, and impulse-vector. reaction, converging, and diverging. impulse, reaction, and impulse reaction.
As the generator load is increased (within its rated capacity), the voltage will:
remain constant and the amperage output will increase. remain constant and the amperage output will decrease. decrease and the amperage output will increase.
A fixed pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out of track allowance by 1/16 inch. The excessive out of track condition may be corrected by:
discarding the propeller since out of track conditions cannot be corrected. placing shims between the inner flange and the propeller. slightly overtightening the attachment bolts adjacent to the most forward blade.
When a magneto is disassembled, keepers are usually placed across the poles of the rotating magnet to reduce the loss of magnetism. These keepers are usually made of:
cobalt steel. soft iron. chrome magnet steel.
Upon what quality or characteristic of a lubricating oil is its viscosity index based?
Its resistance to flow at a standard temperature as compared to high grade paraffin base oil at the same temperature. Its rate of change in viscosity with temperature change. Its rate of flow through an orifice at a standard temperature.
Excessive valve clearance in a piston engine:
increases valve opening time. increases valve overlap. decreases valve overlap.
What indications may shift when a turbofan engine anti-icing (bleed air) system is turned on?
1. Tachometer.
2. EGT.
3. EPR. 1, 2, and 3. 1 and 2. 2 and 3.
Compared to normally aspirated engines, turbocharged engine exhaust systems operate at:
similar temperatures and higher pressures. similar temperatures and pressures. higher temperatures and higher pressures.
Which of the following could cause damage to the nose ceramic or to the electrode of an aircraft spark plug? plug installed without a copper gasket excessive magneto voltage improper gapping procedure.
Boost pumps in a fuel system: are primary used for fuel transfer provide a positive flow of fuel to the engine pump operate during takeoff only.
The purpose of an intercooler when used with a turbocharger is to cool the: turbocharger bearings air entering the carburetor from the turbocharger exhaust gases before they come in contact with the turbo drive.
Which of the following is the safest fire extinguishing agent to use from a standpoint of toxicity and corrosion hazards? bromotrifluoromethane (halon 1301) bromochlorodifluoromethane (halon 1211) dibromodifluoromethane (halon 1202).
What effect does high atmospheric humidity have on the operation of a jet engine? has little or no effect decreases engine pressure ratio decreases compressor and turbine RPM.
How does high tension ignition shielding tend to reduce radio interference? receives and grounds high frequency waves coming from the magneto and high tension ignition leads prevents ignition flashover at high altitudes reduces voltage drop in the transmission of high tension current.
What type of turbine blade is most commonly used in aircraft jet engines? impulse-reaction impulse reaction.
Into what part of a reciprocating engine induction system is deicing alcohol normally injected? the supercharger or impeller section the airstream ahead of the carburetor the low pressure area ahead of the throttle valve.
Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counterweights increase pitch angle using: centrifugal twisting moment spring pressure oil pressure.
You are performing a 100-hour inspection on an R985-22 aircraft engine. What does the "985'' indicate? the total piston displacement of the engine the total piston displacement of the cylinder the pistons will pump a maximum of 985 cubic inches of air per crankshaft revolution.
The low pitch stop on a constant speed propeller is usually set so that: the engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure maximum allowable engine RPM cannot be exceeded with any combination of manifold pressure, altitude, or forward speed the limiting engine manifold pressure cannot be exceeded with any combination of throttle opening, altitude, or forward speed.
(Refer to figure 4.) The following data concerning the installation of an electrical unit is known: current requirements for continuous operation - 11 amperes; measured cable length - 45 feet; system voltage - 28 volts (do not exceed 1 volt drop); cable conduit and bundles. What is the minimum size copper electrical cable that may be selected? no. 14 no. 12 no. 10.
Propeller blade tracking is the process of dertermining: 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 the plane of rotation of the propeller with respect to the aircraft longitudinal axis.
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 dumulsibility.
What operational force causes the greatest stress on a propeller? aerodynamic twisting force centrifugal force thrust bending force.
Which of the following statements concerning the installation of a new fixed pitch wood propeller is true? NAS close tolerance bolts should be used to install the propeller inspect the bolts for tightness after the first flight and again after the first 25 hours of flying if a separete metal hub is used, final track should be accomplished prior to installing the hub in the propeller.
On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected? X rayed to detect any cracks with the heater air shroud removed hydorstatically tested.
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.
What tool is generally used to measure the crankshaft rotation in degrees? prop protactor dial indicator timing disk.
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.
When running up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to: free the dome of any entrapped air test the maximum RPM setting of the governor seat the blades fully against the low pitch stop.
During engine operation at speeds lower than those for which the constant speed propeller control can govern in the INCREASE RPM position, the propeller will: remain in the full LOW PITCH position maintain engine RPM in the normal manner until the HIGH PITCH stop is reached remain in the full HIGH PITCH position.
The stators in the turbine section of a gas turbine engine: increase the pressure of the gas flow decrease the velocity of the gas flow increase the velocity of the gas flow.
What is the function of the stator vane assembly at the discharge end of a typical axial flow compressor? to direct the flow of gases into the combustion chambers to increase air swirling motion into the combustion chambers to straighten airflow to eliminate turbulence.
What is the possible cause of an engine running rich at full throttle if it is equipped with a float type carburetor? clogged main air bleed clogged atmospheric vent float level too low.
Which federal aviation regulation specifies that each resettable circuit protective device requires a manual operation to restore service after the device has interrupted the circuit? 14 CFR part 43 14 CFR part 23 14 CFR part 91.
Which of the following occurs to cause front cone bottoming during propeller installation? the front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub the front cone becomes bottomed in the front propeller hub cone seat before the rear propeller hub cone seat has engaged the rear cone the front cone enters the front propeller hub cone seat at an angle causing the propeller retaining nut to appear tight when it is only partially tightened.
It is necessary to control acceleration and deceleration rates in turbine engines in order to: prevent friction between turbine wheels and the case due to expansion and contraction prevent overtemperature prevent blowout or die out.
What should be used to clean grease or carbon tracks from capacitors or coils that are used in magnetos? acetone naphtha solvent.
An APU is usually rotated during start by: an electric starter a pneumatic starter a turbine impingement system.
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