The breaking loose of small pieces of metal from coated surfaces, usually caused by defective plating or excessive loads, is called:
chafing. flaking. brinelling.
What will occur if the vapor vent float in a pressure carburetor loses its buoyancy?
A rich mixture will occur at all engine speeds. The engine will continue to run after the mixture control is placed in IDLE CUTOFF. The amount of fuel returning to the fuel tank from the carburetor will be increased.
The purpose of an under current relay in a starter-generator system is to:
keep current flow to the starter-generator under the circuit capacity maximum. disconnect power from the starter-generator and ignition when sufficient engine speed is reached. provide a backup for the starter relay.
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.
The function of an APU air inlet plenum is to:
stabilize the pressure of the air before it enters the compressor. decrease the pressure of the air before entering the compressor. increase the velocity of the air before entering the compressor.
What is used in turbine engines to aid in stabilization of compressor airflow during low thrust engine operation?
Stator vanes and rotor vanes. Variable guide vanes and/or compressor bleed valves. Pressurization and dump valves.
Which of the following factors affect the thermal efficiency of a turbine engine?
1. Turbine inlet temperature.
2. Compression ratio.
3. Ambient temperature.
4. Speed of the aircraft.
5. Turbine and compressor efficiency.
6. Altitude of the aircraft.
3, 4, 6. 1, 2, 5. 1, 2, 6.
After making a welded repair to a pressurized type turbine engine oil tank, the tank should be pressure checked to:
not less than 5 PSI plus the average operating pressure of the tank. 5 PSI. not less than 5 PSI plus the maximum operating pressure of the tank.
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.
During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon the:
barometric pressure. air velocity. air temperature.
The component(s) in a turbine engine that operate(s) at the highest temperatures is/are the:
first stage turbine nozzle guide vanes. turbine disks. exhaust cone.
A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the:
possibility of induction system overboost. loss of power and possible detonation. inability of the engine to supply enough heat to make a significant difference.
Which of the following best describes the blade movement of a full feathering, constant speed propeller that is in the LOW RPM position when the feathering action is begun?
Low pitch through high pitch to feather position. High pitch directly to feather position. High pitch through low pitch to feather position.
An engine lubrication system pressure relief valve is usually located between the:
scavenger pump and the external oil system. pump and the internal oil system. oil cooler and the scavenger pump.
After spark plugs from an opposed engine have been serviced, in what position should they be reinstalled?
Next in firing order to the one from which they were removed. Next in firing order to the one from which they were removed and swapped bottom to top. Swapped bottom to top.
During what period does the fuel pump bypass valve open and remain open?
When the fuel pump output is greater than the demand of the carburetor. When the fuel pump pressure is greater than the demand of the engine. When the boost pump pressure is greater than fuel pump pressure.
High cylinder head temperatures are likely to result from:
a very rich mixture at high power settings. fouled spark plugs. a very lean mixture at high power settings.
In what units are turbine engine tachometers calibrated?
Percent of engine RPM. Percent of engine pressure ratio. Actual engine RPM.
Where would a carburetor air heater be located in a fuel injection system?
None is required. At the air intake entrance. Between the air intake and the venturi.
In an airplane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged, the:
system will automatically allow warm, unfiltered air to be drawn into the engine. system will automatically allow warm, filtered alternate air to be drawn into the engine. flow of air into the engine will be slowed or cut off unless alternate air is selected.
Reciprocating engine exhaust systems that have repairs or sloppy weld beads which protrude internally are unacceptable because they cause:
base metal fatigue. localized cracks. local hot spots.
The horsepower developed in the cylinders of a reciprocating engine is known as the:
indicated horsepower. brake horsepower. shaft horsepower.
Idle cutoff is accomplished on a carburetor equipped with a back suction mixture control by:
introducing low pressure (intake manifold) air into the float chamber. turning the fuel selector valve to OFF. the positive closing of a needle and seat.
During an operational check of an electrically powered radial engine cowl flap system, the motor fails to operate. Which of the following is the first to be checked?
Flap actuator motor circuit breaker. Flap actuator motor. Cockpit control switch.
A certain direct current series motor mounted within an aircraft draws more amperes during start than when it is running under its rated load. The most logical conclusion that may be drawn is:
the condition is normal for this type of motor. the starting winding is shorted. the brushes are floating at operating RPM because of weak brush springs.
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 density controller in a turbocharger system?
Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle. Limits the maximum manifold pressure that can be produced at other than full throttle conditions. Maintains constant air velocity at the carburetor inlet.
If a float type carburetor leaks fuel when the engine is stopped, a likely cause is that the:
float needle valve is worn or otherwise not seated properly. main air bleed is clogged. float level is adjusted too low.
In a fixed fire-extinguishing system, there are two small lines running from the system and exiting overboard. These line exit ports are covered with a blowout type indicator disc. Which of the following statements is true?
When the red indicator disc is missing, it indicates the fire extinguishing system has been normally discharged. When the yellow indicator disc is missing, it indicates the fire extinguishing system has been normally discharged. When the green indicator disc is missing, it indicates the fire extinguishing system has had a thermal discharge.
What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?
Accelerated oil breakdown and oxidation. Excessive thinning of the engine oil. Oil starvation of bearings and other parts.
Which of the following engine servicing operations generally requires engine pre oiling prior to starting the engine?
Engine installation. Engine oil and filter change. Replacement of oil lines.
What type of imbalance will cause a two blade propeller to have a persistent tendency to come to rest in a horizontal position (with the blades parallel to the ground) while being checked on a propeller balancing beam?
Vertical. Harmonic. Horizontal.
A common type of electrically operated oil temperature gauge utilizes:
vapor pressure and pressure switches. either a wheatstone bridge or ratiometer circuit. a thermocouple type circuit.
Which of the following types of electric motors are commonly used in electric tachometers?
Direct current, series wound motors. Synchronous motors. Direct current, shunt-wound motors.
What is the purpose of an engine-driven fuel pump bypass valve?
To divert the excess fuel from the pressure side of the pump to the inlet side of the pump. To divert the excess fuel back to the main tank. To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.
A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering:
prevailing atmospheric pressure. lower than normal for conditions prevailing. zero.
After a fire is extinguished, or overheat condition removed in aircraft equipped with a Systron-Donner fire detector, the detection system:
automatically resets. sensing component must be replaced. must be manually reset.
On a float type carburetor, the purpose of the economizer valve is to:
provide extra fuel for sudden acceleration of the engine. provide a richer mixture and cooling at maximum power output. maintain the leanest mixture possible during cruising best power.
Magneto breaker point opening relative to the position of the rotating magnet and distributor rotor (internal timing) can be set most accurately:
during assembly of the magneto before installation on the engine. by setting the points roughly at the required clearance before installing the magneto and then making the fine breaker point adjustment after installation to compensate for wear in the magneto drive train. during the magneto to engine timing operation.
The part of a dc alternator power system that prevents reverse flow of current from the battery to the alternator is the:
voltage regulator. rectifier. reverse current relay.
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