Volume 2 2A651 Cdc ( Q 16-44 )

1. Stationary vanes positioned between rotor discs in a compressor are used to

Direct air and increase pressure.

Direct hot gases rearward.

Increase backup pressure.

Prolong compressor life.

2. What is the most common type of fuel nozzle system?

Pressure-atomizing.

Fuel-blasting.

Fuel ejector.

Fuel tube.

3. The recommended method of heating inner races of bearings before installing them is

Hot-oil bath.

Portable heater.

Bearing furnace.

Hydraulic oil bath.

4. Three types of turbine and vane assemblies used in jet engines are impulse,reaction,and

Fir tree.

Shrouded.

Unshrouded.

Reaction-impulse.

5. Fuel that accumulates after a failed start is

Returned to the fuel control by tubes.

Drained overboard by a drain system.

Burned on the next start attempt.

Allowed to evaporate.

6. The bearing removal tools that are most commonly used include

Drift pipes and hammers.

Bearing pullers and hammers.

Drift pipes and arbor presses.

Arbor presses and bearing pullers.

7. The two forces that air is subjected to after it is drawn into the guid vanes of a centrifugal commpressor are

Rotational and centrifugal.

Rotational and tangential.

Tangential and centrifugal.

Tangential and radial

8. When you handle jet engine bearings,you must change cotton gloves frequently becasue they

Wear faster.

Attract dirt.

Cause oxidation.

Get soaked with sweat.

9. On an F108 engine,the radial drive shaft connects the core engine to the

Hydraulic actuator motor.

Accessory drive assembly.

Variable bleed valves.

Fan booster rotor.

10. Before inspecting new jet engine bearings,you should

Sperate the halves.

Apply a preservative.

Perform a spin check.

Remove the preservative coating.

11. The three major sections of all jet engines are compressor, combustion,and

Turbo.

Turbine.

Exhaust.

Diffuser.

12. The purpose of the exhaust duct is to

Swirl exhaust gas-flow.

Equalize exhaust gas -flow.

Straighten exhaust gas-flow.

Modulate exhaust gas-flow.

13. Which component reduces the engine rotor speed to the rpm required for accessories?

Step motors.

Reduction motor.

Reduction geartrain.

Gear case drive assembly.

14.
The excess airflow that is not burned in the combustion section is used to

Cool the burner surfaces.

Operate pneumatic accessories

Decrease the mass of exhaust gases.

Increase air in the compressor section.

15. Swirl-type fuel nozzles usually are used to provide what type of flame speed?

Low.

High.

Medium.

Medium-high.

16. Vane-type fuel pumps used in jet engines are similar to

Sliding-vane air compressors.

Piston pump air compressors.

Roots air compressors.

Turbo-superchargers.

17. Excessive bearing wear can usually be detected by

Pits.

Bands.

Misalignment.

Roughness of the metal.

18. Which facet of engine design helps prevent igniter plug fouling?

Gold plating on the plug.

Split electrode on the plug.

Ceramic coating on the plug.

Directing air around the plug.

19. The parts on a can-annular combustion section must be removed in a specific order because of the

Fuel nozzle.

Transition liner.

Combustion chamber outer case.

Combustion chamber crossover tubes.

20. A constuctional feature of the centrifugal compressor is that the impeller

Has two matching lpates.

Has a lighweight design.

Is forged as a single unit.

Is constructed in rows of blades and stators.

21. Why is the " fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc preferred?

There is a significant temperature differential between the turbine rotor disc and the blades.

This method aids in preventing horizontal movement of the blades.

This method aids in preventing axial movement of the bucket.

There is more blade tip shake during engine operation.

22. Which type of defect appears on bearings as a result of bearing parts striking together?

Nicks.

Galling.

Grooves.

Scratches

23. Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?

Pits.

Bands.

Grooves.

Brinelling.

24. How many different types of loads can be imposed on a jet engine bearing?

Two.

Three.

Four.

Five.

25. The forward end of the shaft on a centrifugal compressor is hollow in order to

Act as a vibration damper.

Allow cooling air to the turbine.

Provide a passage for lubricating oil.

Provide a passage for the main fuel supply.

26. In a dual-spool compressor,rpm of the N2 compressor are determined by the

Starter.

Fuel pump.

Fuel control.

Low-pressure turbine.

Beer

27. What is placed in front of the rotating blades in an engine turbine section?

Rotating vanes.

Inlet guide vanes.

Turbine rotating nozzles.

Turbine nozzle vane assembly.

28. The exhaust duct connects the turbine outlet and the

Fan duct.

Jet nozzle.

Fuel nozzle.

Bifurcated duct.

29. The purpose of an augmentor (afterburner) in a jet engine is to

Increase engine rpm.

Reduce pressure drop.

Augment basic engine thrust.

Increase EGT.

Volume 2 2A651 CDC ( Q 16-44 )