POWERPLANT-ENGINE 2

Which of the following engine variables is the most critical during turbine engine operation?

• Compressor inlet air temperature.

• Compressor RPM.

• Turbine inlet temperature.

Which turbine engine compressor offers the greatest advantages for both starting flexibility and improved high-altitude performance?

• Dual-stage, centrifugal-flow.

• Split-spool, axial-flow.

• Single-spool, axial-flow.

An advantage of the centrifugal-flow compressor is its high

• pressure rise per stage.

• ram efficiency.

• peak efficiency.

Which two elements make up the axial-flow compressor assembly?

• Rotor and stator.

• Compressor and manifold.

• Stator and diffuser.

Standard sea level pressure is

• 29.00”Hg.

• 29.29”Hg.

• 29.92”Hg.

Using standard atmospheric conditions, the standard sea level temperature is

• 15°C.

• 59°C.

• 29°C.

When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?

• Bending and torsion.

• Torsion and tension.

• Stress rupture.

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

• Straighten the airflow and eliminate turbulence.

• Increase the velocity and prevent swirling and eddying.

• Decrease the velocity, prevent swirling, and decrease pressure.

Compressor field cleaning on turbine engines is performed primarily in order to

• Prevent engine oil contamination and subsequent engine bearing wear or damage.

• Facilitate flightline inspection of engine inlet and compressor areas for defects or FOD.

• Prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.

Hot section inspections for many modern turbine engines are required

• Only at engine overhaul.

• Only when an overtemperature or overspeed has occurred.

• On a time or cycle basis.