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A&P Powerplant Oral Practice Questions > Turbine Engines > Flashcards

Turbine Engines Flashcards

1
Q
  1. What are the major components of a typical gas turbine engine?
A

Air intake
Compression
Combustion
Turbine
Exhaust
Accessory

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2
Q
  1. What are the two principal types of compressors use in turbojet aircraft?
A

Centrifugal flow & axial flow

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3
Q
  1. What are the four combustion chamber systems?
A

Can
Can-annular
Annular
Reverse flow annular

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4
Q
  1. What is the purpose of the inter connector tubes between can type combustion chambers?
A

Spread flame to the combustion chambers

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5
Q
  1. What prevents burning of the liner walls in a can type combustion chamber?
A

Louvers direct cooling layer of air along inside wall of the liner

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6
Q
  1. What types of damage may be found when inspecting compressor blades?
A

Dents
Scratches
Gouges
Galling
Burns
Burrs
Pitting
Cracks

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7
Q
  1. What is the location and function of the diffuser sedation in a turbine engine?
A

To change high velocity compressor discharge air to static pressure

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8
Q
  1. Where are stress rupture cracks most likely to occur on turbine blades
A

On or across heading or trailing edge of blades

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9
Q
  1. How are compressor blades attached to a disk type rotor?
A

Fitted into the disc by bulb-type, fir-tree, or dove tail type roots then secured with screws

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10
Q
  1. What is the purpose of the nozzle diaphragm or turbine nozzle?
A

Combustion mass airflow to drive the turbine & defects the gases so they struck the turbine at most efficient angle

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11
Q
  1. What is the major difference between turboprop and turbojet engines?
A

Turboprop has more stages

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12
Q
  1. What is a turbofan engine?
A

Instead of propeller spins duct enclosed axial flow fan

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13
Q
  1. What is the effect of air density on the thrust of a turbine engine?
A

If density increases thrust increases if decreases thrust decreases

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14
Q
  1. What are the two most common types of thrust reversers?
A

Mechanical blockage type
Aerodynamic blockage type

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15
Q
  1. What is a split compressor system in a turbine engine?
A

Requires two concentric shafts joining the turbine stages to respective compressors

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16
Q
  1. What is one method of relieving thermal stress on a turbine disk?
A

Direct cooling bleed air back onto the face of the disk

17
Q
  1. What may be the indications if a turbojet engine is out of trim?
A

High EGT for takeoff

18
Q
  1. What is a free turbine?
A

Drives a propeller or helicopter transmission

19
Q
  1. What is the main purpose of thrust reversers?
A

Slow the aircraft to effective braking speeds

A&P Powerplant Oral Practice Questions (15 decks)

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