PP 19

Which of the following is the ultimate limited factor of turbojet engine operation?. Turbine inlet temperature. Compressor inlet air temperature.

How the turbine shaft is usually jointed to the compressor rotor of a centrifuge compressor turbine engine?. Splined coupling. Bolted coupling.

Which of the following engine variables is the most critical during turbine engine operation?. Turbine inlet temperature. Compressor RPM.

What should be done if a turbine engine’s exhaust duct catches fire during starting?. Turn off the fuel and continue cranking. Continue starting attempt to blow out fire.

What is the proper starting sequence for a turbo-jet engine?. Starter, ignition, fuel. Ignition, starter, fuel.

What units in a gas turbine engine aid in stabilization of the compressor during low thrust engine operations?. Bleed air valves. Stator vanes.

Dirty compressor blades in a turbine engine could result in: High EGT. Low RPM.

The exhaust section of a turbine engine is designed to: Impart a high exit velocity to the exhaust gases. Increase temperature, therefore increasing velocity.

How many igniters are normally used on a turbine engine having nine burner cans?. Two. One.

What type of oil system is usually found on turbo-jet engines?. Dry sump, pressure, and spray. Dry sump, dip, and splash.

The Brayton cycle is known as the constant: Pressure cycle. Volume cycle.

What term describes permanent cumulative turbine blade deformation?. Creep. Stretch.

A turbine engine dry-sump lubrication system of the self-contained, high-pressure design: Consists of pressure, breather, and scavenge subsystems. Uses the same storage area as a wet-sump engine.

What type of oil pump is most commonly used on turbojet engines?. Gear. Centrifugal.

In what units are turbine engine tachometers calibrated?. Percent of engine RPM. Actual engine RPM.

The type of ignition system used on most jet aircraft engines is: Capacitor discharge. High resistance.

Which types of fuel nozzles are used in turbine engine combustion chambers?. Simplex and duplex. Constant flow and variable.

Which type of fuel control is used on most of today’s turbine engines?. Electronic. Hydromechanical.

What would be the probable result if the oil system pressure relief valve sticks open?. Insufficient lubrication. Increased oil pressure.

When trimming a turbine engine, the fuel control is adjusted to: Limit idle RPM and maximum speed. Produce as much power as possible.

What happens to velocity as subsonic air flows through a convergent nozzle?. Increases. Decreases.

What happens to velocity as supersonic air flows through a divergent nozzle?. Increases. Decreases.

Anti-icing of turbojet engine air inlets is accomplished by: Engine bleed air ducted through the critical areas. Electrical heating elements inside the IGVs.

When starting a turbine engine, the starter should be disengaged: After the engine has reached self-accelerating speed. When engine lights are off.

What is meant by a double entry centrifugal compressor?. A compressor that has two intakes. Two compressors and two impellers.

Stator blades in the compressor section of an axial-flow engine: Decrease the air velocity and prevent swirling. Increase the air velocity.

gas turbine engine comprises three main sections: Compressor, combustion, and turbine. Turbine, combustion, and scavenge.

What type of turbine blade is most commonly used in jet engines?. Reaction-Impulse (Impulse-Reaction). Reaction.

Continued/excessive heat + centrifugal force on turbine blades likely causes: Creep. Profile.

The air passing through the combustion chamber of a jet engine is: Used to support combustion and to cool the engine. Entirely combined with fuel and burned.