Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

PPL - AGK > Piston Engine > Flashcards

Piston Engine Flashcards

1
Q

What are the 2 components of “mixture”

A
  1. Fuel
  2. Air

Burned in a confined space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the basic 2 elements of how a piston engine works

A
  1. Mixture burned forces MECHANICAL movement
  2. Mechanical movement transformed into ROTARY motion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

A reciprocating engine is made up of what 4 parts

A
  1. Cylinders
  2. Camshaft
  3. Crankcase
  4. Accessory Housing

Cylinders Can crank accessively

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What 3 components are located in the cylinder

A
  1. Intake/Exhaust valves
  2. Spark Plugs
  3. Pistons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the primary responsibility of the camshaft

A

Ensure intake/exhaust valves open/close at correct time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the primary responsibility of the crankshaft

A

Tranform up/down piston motion into rotary motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the 4 strokes of the Otto cycle

A
  1. Suck (Intake)
  2. Squeeze (Compression)
  3. Bang (Power)
  4. Blow (Exhaust)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

At what stage of the otto cycle does the intake valve open.
What position is the piston in

A
  1. Intake / Suck
  2. Top Dead Centre (TDC)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

At what stage of the otto cycle does the intake valve close
What position is the piston in

A
  1. Intake / Suck
  2. Bottom Dead centre (BDC)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

During the intake stroke, what is the piston moved down by and what happens as a result

A
  1. Crankshaft rotation moves piston down
  2. Sucks in fuel & air mixture
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What direction is the piston moving during the compression cycle

A

UP

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is a typical compression ratio of a lycoming piston engine

A

7:1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the definition of a compression ration

A

The amount the mixture is compressed by when taking the complete volume of the cylinder into account

Complete volume of cylinder when piston BDC
Compressed volume of cylinder when piston TDC

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

A higher compression ratio makes the engine MORE or LESS efficient

A

MORE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What direction is the piston moving during the power cycle

A

DOWN

Forced by expanding of burning mixture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What position is the piston in when the power stroke completes

A

Bottom Dead Centre
(BDC)

17
Q

What part of the otto cycle will the exhaust valve open

A

EXHAUST

18
Q

What position will the piston be in when the exhaust valve closes

A

Top Dead Centre
(TDC)

19
Q

How many revolutions of the crank shaft occur during a 4 stroke process

A

2

20
Q

When the spark typically gets produced, what position is the piston

Normal operation, and not during start up

A

20॰ advanced of TDC

21
Q

Why are valve timings adjusted on a 4 stroke engine

A

IMPROVE EFFICIENCY

22
Q

Modified 4 stroke cycle

When will the exhaust close (what position is the piston)
During which cycle

A
  1. 20॰ after TDC
  2. End of EXHAUST cycle/During INDUCTION cycle
23
Q

Modified 4 stroke cycle

When will the inlet valve open (what position is the piston)
During which cycle

A
  1. 15॰ before of TDC
  2. During EXHAUST / Beginning of INDUCTION
24
Q

Modified 4 stroke cycle

When will the inlet close (what position is the piston)

A

75॰ after BDC

25
Q

modified 4 stroke cycle

When will the spark occur (what position is the piston)
During which cycle

A
  1. 25॰ before TDC
  2. End of COMPRESSION / Beginning of POWER
26
Q

Modified 4 stroke cycle

When will the exhaust outlet open (what position is the piston)
During which cycle

A
  1. 70॰ before BDC
  2. End of POWER / Beginning of EXHAUST
27
Q

What is the definition of pre-ignition

A

Fuel/Air mixture igniting too early

28
Q

What are 4 common causes of pre ignition

A
  1. Timing
  2. Hot Spot
  3. Octane
  4. Pressure

  1. Incorrect enging timing
  2. Engine Hot-Spots
  3. Incorrect fuel octane rating (too low)
  4. High cylinder pressure
29
Q

What are 2 symptoms to identify pre-ignition

A
  1. “Knocking”
  2. High Cylinder Temperature
30
Q

What temperature and above would indicate high cylinder temperature

A

above 400॰ F

PPL - AGK (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions