15.1 Flashcards

1
Q

What’s the earth’s gravitational speed

A

9.8m/s squared

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2
Q

How’s weight calculated

A

Mass X acceleration due to gravity

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3
Q

What’s the equation for work and what’s the SI unit for it?

A

Force X distance

Joules

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4
Q

What’s the equation for power and what’s the SI unit

A

Work/Time

Watts and kilowatts

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5
Q

What’s Newton’s first law

A

A body will remain at rest and a body motion continues to move at a constant velocity unless acted upon by an unbalanced force

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6
Q

What’s Newton’s second law

A

Acceleration produced in a mass by a force acting on its directly proportional to the force and inversely proportional to the mass

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7
Q

What’s Newton’s third law

A

Every action has an equal and opposite

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8
Q

What’s the Brayton cycle ( what order does air flow through the compressors in )

A

Inlet
Compression
Combustion
Exhaust

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9
Q

What happens to pressure and volume of air during isobaric heating

A

Pressure doesn’t rise
Volume does

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10
Q

What’s the name for the working cycle of a gas turbine engine

A

Brayton cycle

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11
Q

What advantages and disadvantages do piston type engines have in comparison to gas turbine engines

A

Advantage= more fuel efficient
Disadvantages= don’t perform well at high altitudes

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12
Q

What’s another name for engines that use jet propulsion

A

Reaction engines

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13
Q

Whats a disadvantage of turbojet engines

A

Very Loud and require more fuel

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14
Q

What’s the purpose of a reduction gear in turboprop engines

A

To reduce high gas turbine engine rotation speeds to speeds that can be ,amazed by the propellor

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15
Q

What do turboprop engines convert gas into

A

Torque

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16
Q

How many spools are turbofan engines made up of

A

Dual or triple spool

17
Q

Do turbofan engines usually contain a reduction gear?

A

No

18
Q

Due to high fan airflow how much of the total thrust can the fan produce

A

More than 80%

19
Q

What’s the bypass ratio of modern turbofan engines

A

Between 4:1 and 9:1

20
Q

How much less fuel do typical ac engines use than engines with a high bypass ratio

A

20%

21
Q

What type of engines are predominantly short ducted

A

High bypass engines

22
Q

What are advantages for the MANUFACTURER for a modular engine construction

A
  • rotating parts can be pre balanced
  • less spare engines needed in stock
  • more flexibility when changes are required To individual engine parts
  • easily transported and stored
23
Q

What are advantages for the ENGINE OPERATOR for modular engine designs

A
  • parts can be removed and replaced while maintaining minimum disturbance to other engine parts
  • rebalancing not required after changing parts
  • most modules can be replaced while on ac
  • less spares needed and easily transported
24
Q

What are aluminium alloys used for in engine construction used for

A

Gearbox housings
Fan stator housings
Other low loaded parts

25
Q

Where in the engine are ceramic coatings used

A

Combuster
High pressure turbines

26
Q

What parts of the engines are made from steel alloys

A

N1 drive shaft, engine bearings & main structural members

27
Q

What parts of the engine are made from Colbalt based alloys made from

A

Stator of first stage of hp turbine

28
Q

What are nickel and titanium alloys used for in engine construction

A

Compressor and turbines as they can withstand high centrifugal loads

29
Q

What’s an advantage and disadvantage or non modular engine construction

A

Saved weight

Parts difficult to access and design complicated