Engine Operation & Maintenance

What is the purpose of an engine firewall?

• It separates the hot section from the cold section.
• It separates the accessory gearbox from the main drive shaft.
• It ensures the hot air mixes with the cold air flow.

What do you understand by a part throttle rated engine?

• Power intentionally limited to less than rated power.
• Take off power is available before full throttle position.
• Take off power is achieved on a cold day.

When removing an engine for long-term storage, bleed valves should be

• removed.
• locked closed.
• open but blanked.

Cracks may occur in hot section of engine components if during inspection with they are marked

• lead pencil.
• chalk.
• layout dye.

How would you carry out compressor cleaning on a gas turbine engine with stubborn stain deposits?

• with grit blasting.
• use water with mixture of some chemicals.
• high speed water spray.

The wires in the thermocouples probes are usually made from

• chromel and aluminium..
• cadmium and alumel.
• chromel and alumel.

The Brayton cycle is known as the constant

• temperature cycle
• mass cycle
• pressure cycle

The highest heat to metal contact in a jet engine is the

• burner cans
• turbine blades
• turbine inlet guide vanes

The propulsive efficiency is

• low, with a low mass flow acceleration
• high, with a low mass flow acceleration
• high, with a high mass flow acceleration

  The variable inlet guide vanes are operated

• by fuel pressure
• electrically from cockpit
• using N1 fan speed