GTS FKA 1

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Questions and Answers

In an aircraft DC system, the function of the current limiter is to:

Reduce generator output when a safe load is exceeded. (correct)

Sense and adjust the output of the generator automatically.

Provide limited amounts of power for essential loads.

Convert AC to DC power.

In an aircraft electrical system, the function of the distribution bus is to:

Connect the generator bus to the synchronising bus.

Provide 28V DC.

Distribute AC or DC power to various areas of the aircraft. (correct)

Prevent battery discharging through the generator.

Which electrical bus powers vital or emergency loads?

Essential bus.

Generator feeder bus.

Mains power bus.

Hot bus. (correct)

Which of the following is an advantage of alternating current compared to direct current?

Lower electrical losses when transmitted to equipment. Signup and view all the answers

In an aircraft AC system, the inverter:

Converts DC voltage to an AC voltage. Signup and view all the answers

Altimeters, vertical speed indicators, airspeed indicators and artificial horizons belong to which instrument category?

Flight handling. Signup and view all the answers

Voltmeters, ammeters and frequency meters belong to which miscellaneous instrument category?

Electrical. Signup and view all the answers

How would a typical quantitative circular scale display instrument indicate the maximum and/or minimum operating limits?

Red radial line. Signup and view all the answers

Absolute pressure is any pressure measured with reference to:

An absolute vacuum. Signup and view all the answers

Fluid pressure is defined as:

The pressure exerted by a liquid or gas. Signup and view all the answers

Static pressure is pressure:

Of the air surrounding the aircraft. Signup and view all the answers

Which type of check is required when any item of the pitot/static system is removed or replaced?

Leak check. Signup and view all the answers

The air temperature that increases temperature due to the ram compression of the boundary layer is:

Ram air temperature (RAT). Signup and view all the answers

The temperature which is measured after the final turbine stage is:

Exhaust Gas Temperature (EGT). Signup and view all the answers

Thermocouple temperature measurement systems direct hot exhaust gases over the:

Hot junction of a thermocouple, which creates an EMF proportional to the gas' temperature. Signup and view all the answers

How is the fuel quantity measured in a mass indication system?

Fuel probe measuring electrical capacitance. Signup and view all the answers

The purpose of an engine fuel system pressurising and dump valve is to:

Divide fuel flow into primary and main fuel mainifolds, and drain fuel from the manifolds on engine shut down. Signup and view all the answers

In the layout of a typical gas turbine engine fuel system, the fuel flow transmitter would be located:

Between the high pressure shut-off cock and the fuel nozzles. Signup and view all the answers

A fuel control unit senses inlet air pressure to:

Enable the fuel control unit to increase or decrease fuel delivery to match the change in mass airflow. Signup and view all the answers

A supervisory electronic engine fuel control system is an electronic device that:

Recieves information from various sources and then limits fuel flow through a hydro-mechanical fuel control. Signup and view all the answers

During engine start-up with a pressure control fuel control unit:

The main spill valve will be closed and servo piston spring tension will move the fuel pump cam plate to full pump output. Signup and view all the answers

In the layout of a typical gas turbine engine fuel system, the high pressure shut-off cock would be located:

Immediately downstream of the fuel control unit. Signup and view all the answers

Why does a fuel control unit have a fuel density adjustment?

To allow for usage of fuel that has a different specific gravity. Signup and view all the answers

A hydro-pneumatic fuel control unit:

Uses engine RPM as its primary control parameter, while compressor outlet pressure and engine inlet air temperature are secondary parameters. Signup and view all the answers

In the layout of a typical gas turbine engine fuel system, the fuel pressure differential switch would be located:

On the low pressure fuel filter. Signup and view all the answers

What is the difference between synthetic and mineral based engine oils?

Mineral oils are derived from crude oil and synthetic oils are produced by synthesis. Signup and view all the answers

The SAE grading of oil gives a rating of the oil's:

Viscosity. Signup and view all the answers

Synthetic engine lubricating oil vapours:

Present health risks, particulalry around hot gas turbine engines. Signup and view all the answers

When replenishing a synthetic based oil system:

The same brand and type of oil should be used. Signup and view all the answers

Synthetic engine oils are disposed of by an authorised contractor in accordance with:

EPA directives. Signup and view all the answers

The characteristic of oil that ensures it remains bound together under compression loads is its:

Film strength. Signup and view all the answers

The main function of an electrically actuated oil tank shut-off valve is to:

Isolate the oil tank contents from the lubrication system. Signup and view all the answers

A significant feature of a total loss oil lubricating system is that it:

Does not need scavenge, filtration or cooling functions. Signup and view all the answers

The main function of an engine lubrication system oil temperature transmitter is to:

Transmit a signal to a cockpit oil temperature indicator. Signup and view all the answers

How is the oil cooled in a cold tank type dry sump lube system?

Oil cooler after the scavenger pump. Signup and view all the answers

Study Notes

Electrical Systems

The current limiter in an aircraft DC system limits the current to prevent electrical overload.
The distribution bus in an aircraft electrical system distributes power to various components.
The essential bus powers vital or emergency loads.

AC Systems

An advantage of alternating current (AC) over direct current (DC) is that AC can be transformed to higher or lower voltages.
The inverter in an aircraft AC system converts DC power to AC power.

Instrument Systems

Altimeters, vertical speed indicators, airspeed indicators, and artificial horizons belong to the flight instrument category.
Voltmeters, ammeters, and frequency meters belong to the electrical instrument category.
Quantitative circular scale display instruments indicate maximum and/or minimum operating limits by displaying a marked range on the dial.

Pressure Measurements

Absolute pressure is measured with reference to a perfect vacuum.
Fluid pressure is defined as the force exerted per unit area.
Static pressure is pressure measured in a static or still environment.

Pitot/Static Systems

A leakage check is required when any item of the pitot/static system is removed or replaced.

Temperature Measurements

The air temperature that increases due to the ram compression of the boundary layer is called ram air temperature.
The temperature measured after the final turbine stage is called turbine outlet temperature.
Thermocouple temperature measurement systems direct hot exhaust gases over the thermocouple.

Fuel Systems

In a mass indication system, fuel quantity is measured by weighing the fuel.
The purpose of an engine fuel system pressurising and dump valve is to pressurise the fuel system and dump excess fuel.
The fuel flow transmitter is located in the fuel system to measure fuel flow.
A fuel control unit senses inlet air pressure to regulate fuel flow.
A supervisory electronic engine fuel control system is an electronic device that monitors and controls fuel flow.
During engine start-up with a pressure control fuel control unit, the fuel flow is controlled by inlet air pressure.
The high-pressure shut-off cock is located in the fuel system to shut off fuel supply.
A fuel control unit has a fuel density adjustment to compensate for changes in fuel density.
A hydro-pneumatic fuel control unit uses hydraulic pressure to regulate fuel flow.
The fuel pressure differential switch is located in the fuel system to monitor fuel pressure differences.

Oil Systems

The difference between synthetic and mineral-based engine oils is their chemical composition and performance.
The SAE grading of oil gives a rating of the oil's viscosity.
Synthetic engine lubricating oil vapors are less hazardous than mineral-based oils.
When replenishing a synthetic-based oil system, the oil must be of the same type and grade.
Synthetic engine oils are disposed of by an authorised contractor in accordance with environmental regulations.
The characteristic of oil that ensures it remains bound together under compression loads is its cohesion.
The main function of an electrically actuated oil tank shut-off valve is to shut off oil supply in emergency situations.
A significant feature of a total loss oil lubricating system is that it does not recirculate the oil.
The main function of an engine lubrication system oil temperature transmitter is to monitor oil temperature.
In a cold tank type dry sump lube system, the oil is cooled by circulating it through a cooler.

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Description

Test your knowledge on the function of a current limiter in an aircraft DC system. Learn about the role of current limiters in ensuring safe operation and protecting electrical components.