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MMET 301 > Prime Movers > Flashcards

Prime Movers Flashcards

1
Q

Internal Combustion Engine Examples

A
  • Gasoline (2 Stroke / 4 Stroke)
  • Diesel (2 Stroke / 4 Stroke)
  • Wankel Rotary
  • Gas Turbine
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2
Q

What is Internal Combustion?

A

The generation of pressurized gas occurs inside the engine

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3
Q

External Combustion Engine Examples

A
  • Steam Turbine
  • Rankine Cycle
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4
Q

4 Stroke Cycle - Gasoline

A
  • Intake
  • Compression
  • Power
  • Exhaust
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5
Q

Intake Stroke - Gasoline

A

Mixture of fuel and air is sucked in through the intake port

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6
Q

Compression Stroke - Gasoline

A

Air-Fuel mixture is compressed and temperature of the mixture rises by several hundred degrees

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7
Q

Power Stroke - Gasoline

A

Compressed air-fuel mixture is ignited by the spark plug

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8
Q

Exhaust Stroke

A

spent fuel-air mixture goes out through the exhaust valves

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9
Q

TDC versus BDC position in 4 stroke

A
  • Intake: TDC to BDC
  • Compression: BDC to TDC
  • Power: TDC to BDC
  • Exhaust: BDC to TDC
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10
Q

When are valves open and closed during 4 stroke?

A

Open: Intake and Exhaust
Closed: Compression and Power

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11
Q

Arrangements of 4 Stroke Gasoline

A
  • Inline
  • Flat
  • V
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12
Q

Advantages of 4 Stroke Engine gasoline

A
  • Relatively efficient to external
  • Relatively inexpensive to gas turbine
  • Relatively easy to refuel to electric car
  • Cleaner Emissions to 2 stroke
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13
Q

What is the entrance and exit sites in a 4 stroke gasoline engine?

A

Valves

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14
Q

What is the entrance and exit sites in a 2 stroke gasoline engine?

A

Ports

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15
Q

Advantages of 2 stroke engine gasoline

A
  • no valves, simpler construction and lower weight
  • fire once every rotation rather than every other
  • can work in any orientation
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16
Q

Disadvantages of 2 stroke engine gasoline

A
  • lack of lubrication system –> wear quickly
  • doesn’t use fuel efficiently, less MPG
  • increased pollution
17
Q

What step is different is 4 stroke diesel compared to gasoline?

A
  • Power Stroke
  • fuel injector injects fuel into compressed air, which immediately ignites
18
Q

Gasoline v Diesel - Intake

A

Gas - Intakes gas and air mixture

Diesel - Intakes Air, compresses it, then injects fuel

19
Q

Gasoline v Diesel - Compression Ratio

A

Gas - 8:1 to 12:1
Diesel - 14:1 to 25:1

20
Q

Gasoline vs Diesel - Carburetion

A

Gas - Mixes air and fuel outside of the cylinder (carburation or port fuel injection)
Diesel - direct fuel injection

MMET 301 (8 decks)

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