TURBINE TEST Flashcards
The primary purpose of an aircraft’s electrical ground is to:
Complete electrical circuit.
Electrically connect the aircraft to the fuel truck in order to prevent sparks from occurring when the truck’s fuel hose first comes in contact with the aircraft’s refueling port.
Dissipate electrical build-ups caused by the airframe interaction with clouds that would otherwise interfere with radio transmissions.
Act as an electrical shock absorber in the event of a lightning strike.
Incorrect
Complete electrical circuit.
The principle that fluids are flexible but non-compressible is the basis for which major aircraft system? The engine fuel system. The hydraulic system. The engine lubrication system. The pneumatic system.
The hydraulic system.
The exhaust section of a turbine engine is designed to:
Impart a low pressure.
Impart a high exit velocity to the exhaust gases.
Impart a low exit velocity.
Reduce pressure and temperature.
Impart a high exit velocity to the exhaust gases.
The primary purpose for utilizing boost pumps in the fuel system is to:
Provide a positive fuel flow to the engine driven fuel pump.
Provide fuel transfer between tanks to maintain an optimum C.G. position.
Provide fuel transfer between tanks to prevent a fuel imbalance.
Prevent unporting of fuel on takeoff.
Provide a positive fuel flow to the engine driven fuel pump.
The highest heat-to-metal contact in a jet engine is the: Compressor section. Turbine inlet guide vanes. Exhaust section. Inlet section.
Turbine inlet guide vanes.
If the RPM of an axial-flow compressor remains constant, the angle of attack of the rotor blades can be changed by:
Raising temperature.
Changing the velocity of the airflow.
Changing pressure of the airflow.
Changing the velocity of the airflow.
Flight at 0g would most adversely affect what aircraft system? Hydraulic Electrical Fuel Engine lubrication
Hydraulic
What is an advantage of having generators running in parallel?
The system voltage can be increased.
AC power is more easily converted to DC power.
They can share electrical loads.
Constant speed drives can be taken offline to extend their service lives.
They can share electrical loads.
Which are protective functions of an AC generator control unit?
Under voltage, differential fault, and manual paralleling.
Overvoltage, current limiting, and generator overspeed.
Generator underspeed and bus-tie circuit-breaker automatic closing.
Overvoltage, current limiting, and generator underspeed.
Overvoltage, current limiting, and generator overspeed.
When the aircraft is shut down after flight, what is the typically used to maintain pressure for the parking break?
The hydraulic accumulator.
The hydraulic fuse.
The hydraulic reservoir.
The in-line variable restrictor orifice.
The hydraulic accumulator.
A cool-off period prior to shutdown of a turbine engine is accomplished in order to:
To allow for free rotation.
Allow the turbine wheel to cool before the case contracts around it.
To allow for lubrication coating.
Allow the turbine wheel to cool before the case contracts around it.
The purpose of a constant speed drive for an AC generator is to: Regulate generator voltage. Control field strength. Regulate generator current. Maintain a uniform frequency.
Maintain a uniform frequency.
The non-rotating axial-flow compressor airfoils in an aircraft gas turbine engine, are called
Compressor vanes.
Stator vanes.
Guide Vanes.
Stator vanes.
An advantage of a hydraulic powered flight control system over a manual control system is:
Immunity from power failures.
Feedback in controls.
Ease in moving large control surfaces.
Ability to operate outside the flight envelope
Ease in moving large control surfaces.
The purpose of a diode is to:
Allow electricity to flow in only one direction.
Act as an electrically operated switch.
Convert AC to DC.
Amplify current.
Allow electricity to flow in only one direction.
What increases or decreases the voltage of a generator so it carries its share of the load? Current limiter. Paralleling circuit. Constant speed drive. Reverse current cut-out relay.
Paralleling circuit.
The stator vanes in an axial-flow compressor:
Convert velocity energy into static pressure energy.
Converts pressure energy into velocity energy.
Convert pressure into higher temperatures.
Convert velocity energy into static pressure energy.
Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called- Diffusers. Compressors. Guide vane sections. Stators.
Stators.
Why are hydraulic reservoirs pressurized?
To assure a positive feed of foam-free fluid to the hydraulic pump at high altitudes.
To provide an alternate source of pressure in case of hydraulic pump failure.
To insure an adequate supply of fluid to the hydraulic pump inlet during negative-G flight.
To provide an alternate source of hydraulic fluid in the event a hydraulic becomes clogged.
To assure a positive feed of foam-free fluid to the hydraulic pump at high altitudes.
The purpose of hydraulic accumulator is to:
Filter debris and remove air.
Compensate for potential loss of pressure at high altitudes.
Maintain Fluid pressure and supply fluid under high demand.
Supply hydraulic fluid for normal operations under low demand.
Maintain Fluid pressure and supply fluid under high demand.
Your ammeter pointer display a positive indication. What information does this provide to the pilot?
The amount of charging current demanded by the battery.
The battery is fully charged.
More current is being drawn from the battery than is being replaced.
The charging rate of the battery.
The charging rate of the battery.
The primary purpose of the fuel-oil heat exchange is to:
Heat the fuel to prevent clogging the transfer lines.
Heat the fuel to prevent ice crystals from clogging fuel filters.
Cool the oil prior to be it being released in to the shafts’ bearing assembly.
Cool the entire oil system oil system in order to keep it within operating limitations.
Heat the fuel to prevent ice crystals from clogging fuel filters.
Why do some turbine engines have more than one turbine wheel attached to a single shaft?
To extract more temperature from exhaust gases.
To reduce velocity flow.
To increase pressure.
To extract more power from the exhaust gases than a single wheel can absorb.
To extract more power from the exhaust gases than a single wheel can absorb.
Kerosene is used as turbine engine fuel because:
Kerosene has a very high volatility which aids in ignition and lubrication.
Kerosene has more heat energy per gallon and lubricates fuel system components.
Kerosene is not susceptible icing at high altitude.
Kerosene does not contain any water.
Kerosene has more heat energy per gallon and lubricates fuel system components.
In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to
Increase temperature.
Straighten the airflow and eliminate turbulence.
Reduce temperature.
Increase pressure.
Straighten the airflow and eliminate turbulence.
One of the most important characteristics of hydraulic fluid is that it cannot be:
Corrosive.
Harmful while coming into contact with human skin.
Susceptible to vaporization.
Capable of breaking down insulation on electrical wires.
Susceptible to vaporization.
A turbine engine hot section is particularly susceptible to which kind of damage?
Cracking/Creep.
Swelling.
Burnout.
Cracking/Creep.
Which of the following engine variables is the most critical during turbine engine operation? Turbine inlet temperature. Turbine velocity. Turbine pressure. Exhaust velocity.
Turbine inlet temperature.
The stators in the turbine section of a gas turbine engine: Increases pressure. Increase the velocity of the gas flow. None of the above. Decreases temperature.
Increase the velocity of the gas flow.
What would be the indication of an impending constant speed drive failure?
Increased static in headset.
Intermittent “Off” flags in flight instruments.
Large voltage variations.
Large frequency variations.
Large frequency variations.
Newton’s First Law of Motion, generally termed the Law of Inertia, states:
Everybody persists in its state of rest, or of motion in a straight line, unless not acted upon by some outside force.
Everybody persists in its state of motion, or of motion in a straight line, unless acted upon by some outside force.
Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.
Everybody persists in its state of rest, or of motion in a straight line, unless acted upon by some outside force.
How are airplane AC generators rated? Volts Kilovolt-amps (KVA) Amps Kilowatts (KW)
Kilovolt-amps (KVA)
The purpose of a transformer-rectifier (TR) is to: Convert AC generator output to DC. Step down DC voltage to a lower value. Step down AC voltage to lower value. Convert DC generator output to AC.
Convert AC generator output to DC.
