Volume 2 2A651 CDC ( Q 16-44 )
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- 1.
The three major sections of all jet engines are compressor, combustion,and
- A.
Turbo.
- B.
Turbine.
- C.
Exhaust.
- D.
Diffuser.
Correct Answer
B. Turbine. -
- 2.
Vane-type fuel pumps used in jet engines are similar to
- A.
Sliding-vane air compressors.
- B.
Piston pump air compressors.
- C.
Roots air compressors.
- D.
Turbo-superchargers.
Correct Answer
A. Sliding-vane air compressors. -
- 3.
The two forces that air is subjected to after it is drawn into the guid vanes of a centrifugal commpressor are
- A.
Rotational and centrifugal.
- B.
Rotational and tangential.
- C.
Tangential and centrifugal.
- D.
Tangential and radial
Correct Answer
A. Rotational and centrifugal. -
- 4.
A constuctional feature of the centrifugal compressor is that the impeller
- A.
Has two matching lpates.
- B.
Has a lighweight design.
- C.
Is forged as a single unit.
- D.
Is constructed in rows of blades and stators.
Correct Answer
C. Is forged as a single unit. -
- 5.
The forward end of the shaft on a centrifugal compressor is hollow in order to
- A.
Act as a vibration damper.
- B.
Allow cooling air to the turbine.
- C.
Provide a passage for lubricating oil.
- D.
Provide a passage for the main fuel supply.
Correct Answer
D. Provide a passage for the main fuel supply. -
- 6.
Stationary vanes positioned between rotor discs in a compressor are used to
- A.
Direct air and increase pressure.
- B.
Direct hot gases rearward.
- C.
Increase backup pressure.
- D.
Prolong compressor life.
Correct Answer
A. Direct air and increase pressure. -
- 7.
In a dual-spool compressor,rpm of the N2 compressor are determined by the
- A.
Starter.
- B.
Fuel pump.
- C.
Fuel control.
- D.
Low-pressure turbine.
- E.
Beer
Correct Answer
C. Fuel control. -
- 8.
Which facet of engine design helps prevent igniter plug fouling?
- A.
Gold plating on the plug.
- B.
Split electrode on the plug.
- C.
Ceramic coating on the plug.
- D.
Directing air around the plug.
Correct Answer
D. Directing air around the plug. -
- 9.
The excess airflow that is not burned in the combustion section is used to
- A.
Cool the burner surfaces.
- B.
Operate pneumatic accessories
- C.
Decrease the mass of exhaust gases.
- D.
Increase air in the compressor section.
Correct Answer
A. Cool the burner surfaces. -
- 10.
Fuel that accumulates after a failed start is
- A.
Returned to the fuel control by tubes.
- B.
Drained overboard by a drain system.
- C.
Burned on the next start attempt.
- D.
Allowed to evaporate.
Correct Answer
B. Drained overboard by a drain system. -
- 11.
The parts on a can-annular combustion section must be removed in a specific order because of the
- A.
Fuel nozzle.
- B.
Transition liner.
- C.
Combustion chamber outer case.
- D.
Combustion chamber crossover tubes.
Correct Answer
D. Combustion chamber crossover tubes. -
- 12.
What is the most common type of fuel nozzle system?
- A.
Pressure-atomizing.
- B.
Fuel-blasting.
- C.
Fuel ejector.
- D.
Fuel tube.
Correct Answer
A. Pressure-atomizing. -
- 13.
Swirl-type fuel nozzles usually are used to provide what type of flame speed?
- A.
Low.
- B.
High.
- C.
Medium.
- D.
Medium-high.
Correct Answer
B. High. -
- 14.
Three types of turbine and vane assemblies used in jet engines are impulse,reaction,and
- A.
Fir tree.
- B.
Shrouded.
- C.
Unshrouded.
- D.
Reaction-impulse.
Correct Answer
D. Reaction-impulse. -
- 15.
What is placed in front of the rotating blades in an engine turbine section?
- A.
Rotating vanes.
- B.
Inlet guide vanes.
- C.
Turbine rotating nozzles.
- D.
Turbine nozzle vane assembly.
Correct Answer
D. Turbine nozzle vane assembly. -
- 16.
Why is the " fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc preferred?
- A.
There is a significant temperature differential between the turbine rotor disc and the blades.
- B.
This method aids in preventing horizontal movement of the blades.
- C.
This method aids in preventing axial movement of the bucket.
- D.
There is more blade tip shake during engine operation.
Correct Answer
A. There is a significant temperature differential between the turbine rotor disc and the blades. -
- 17.
The exhaust duct connects the turbine outlet and the
- A.
Fan duct.
- B.
Jet nozzle.
- C.
Fuel nozzle.
- D.
Bifurcated duct.
Correct Answer
A. Fan duct. -
- 18.
The purpose of the exhaust duct is to
- A.
Swirl exhaust gas-flow.
- B.
Equalize exhaust gas -flow.
- C.
Straighten exhaust gas-flow.
- D.
Modulate exhaust gas-flow.
Correct Answer
C. Straighten exhaust gas-flow. -
- 19.
The purpose of an augmentor (afterburner) in a jet engine is to
- A.
Increase engine rpm.
- B.
Reduce pressure drop.
- C.
Augment basic engine thrust.
- D.
Increase EGT.
Correct Answer
D. Increase EGT. -
- 20.
How many different types of loads can be imposed on a jet engine bearing?
- A.
Two.
- B.
Three.
- C.
Four.
- D.
Five.
Correct Answer
B. Three. -
- 21.
When you handle jet engine bearings,you must change cotton gloves frequently becasue they
- A.
Wear faster.
- B.
Attract dirt.
- C.
Cause oxidation.
- D.
Get soaked with sweat.
Correct Answer
D. Get soaked with sweat. -
- 22.
Before inspecting new jet engine bearings,you should
- A.
Sperate the halves.
- B.
Apply a preservative.
- C.
Perform a spin check.
- D.
Remove the preservative coating.
Correct Answer
D. Remove the preservative coating. -
- 23.
The bearing removal tools that are most commonly used include
- A.
Drift pipes and hammers.
- B.
Bearing pullers and hammers.
- C.
Drift pipes and arbor presses.
- D.
Arbor presses and bearing pullers.
Correct Answer
D. Arbor presses and bearing pullers. -
- 24.
Which type of defect appears on bearings as a result of bearing parts striking together?
- A.
Nicks.
- B.
Galling.
- C.
Grooves.
- D.
Scratches
Correct Answer
A. Nicks. -
- 25.
Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?
- A.
Pits.
- B.
Bands.
- C.
Grooves.
- D.
Brinelling.
Correct Answer
C. Grooves. -
- 26.
Excessive bearing wear can usually be detected by
- A.
Pits.
- B.
Bands.
- C.
Misalignment.
- D.
Roughness of the metal.
Correct Answer
D. Roughness of the metal. -
- 27.
The recommended method of heating inner races of bearings before installing them is
- A.
Hot-oil bath.
- B.
Portable heater.
- C.
Bearing furnace.
- D.
Hydraulic oil bath.
Correct Answer
A. Hot-oil bath. -
- 28.
Which component reduces the engine rotor speed to the rpm required for accessories?
- A.
Step motors.
- B.
Reduction motor.
- C.
Reduction geartrain.
- D.
Gear case drive assembly.
Correct Answer
C. Reduction geartrain. -
- 29.
On an F108 engine,the radial drive shaft connects the core engine to the
- A.
Hydraulic actuator motor.
- B.
Accessory drive assembly.
- C.
Variable bleed valves.
- D.
Fan booster rotor.
Correct Answer
B. Accessory drive assembly. -
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Mar 19, 2022Quiz Edited by
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Dec 21, 2010Quiz Created by
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