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ABE 2 First Exam > Module 4: Internal Combustion Engines > Flashcards

Module 4: Internal Combustion Engines Flashcards

1
Q

mechanical device used to convert the heat energy of fuel produced by combustion into mechanical energy.

A

internal combustion engine

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2
Q

main application of ICE

A

used as prime movers for mobile and field equipment such as tractors, pumps, sprayers, harvesters and threshers

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3
Q

other applications of ICE

A
  • fishing boats to increase fishermen’s mobility
  • places where elec motors cannot be used
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4
Q

parts of ICE converts reciprocating linear motion into?

A

rotational motion

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5
Q

movement of the piston from TDC to BDC or vice versa

A

stroke

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6
Q

highest position attained by the piston when it goes up

A

top dead center (TDC)

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7
Q

lowest position attained by the piston when it goes down

A

bottom dead center

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8
Q

engine classification based on no. of piston movement needed for a cycle

A

1) 4-stroke
2) 2-stroke

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9
Q

engine classification based on manner of igniting the fuel

A
  1. spark ignition
  2. compression ignition
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10
Q

in a 4-stroke cycle engine, each stroke corresponds to what?

A

each corresponds to an event in the cycle

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11
Q

in a 2-stroker cycle engine, power and exhaust happens in one stroke and intake and compression happens on the other

true or false

A

false; power, exhaust, and intake happens in one stroke

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12
Q

in a spark-ignition engine, what is used to ignite the compressed air-fuel mixture?

A

spark plug

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13
Q

spark-ignition engine

spark occurrence is timed when

A

before or at TDC

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14
Q

spark-ignition engine

what type of fuel is used

A

gasoline

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15
Q

spark-ignition engine

air and fuel is mixed and metered by the _________ before the intake event

A

carburetor

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16
Q

engine that uses heat of compressed air to ignite the fuel

A

compression-ignition engine

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17
Q

in a compression-ignition engine, air is compressed to a very high degree

true or false

A

true

18
Q

during intake in a compression-ignition engine, air and fuel is taken in

true or false

A

false; only air is taken in, fuel is injected before end of compression

19
Q

compression-ignition engine

what type of fuel is used

A

diesel

20
Q

in a compression-ignition engine, fuel metering is done by?

A

fuel injection system

21
Q

series of events occurring one after the other in a definite sequence and repeats itself after the last event has occurred.

A

cycle

22
Q

four events comprising an engine cycle

A
  1. intake
  2. compression
  3. power
  4. exhaust
23
Q

cycle of operation (explain the steps)

A

air-fuel mixture or air enters combustion chamber —> it is compressed inside —> spark is produced or fuel is injected and the mixture is ignited resulting to a very rapid expansion of the burning mixture —> constitutes the power of the engine —> burned gases are removed —> cycle is repeated

24
Q

basic engine terminology

A
  1. bore
  2. stroke
  3. piston displacement
  4. clearance volume
  5. total volume
  6. compression ratio
25
Q

engine specifications

A
  1. engine type
  2. engine dimensions
  3. output
  4. capacities
  5. auxiliary systems
26
Q

diameter of the cylinder, inches or mm

A

bore (D)

27
Q

length of travel of the piston from TDC to BDC, inches or mm

A

stroke (L)

28
Q

volume displace by the piston as it moves from BDC to TDC, cubic inches, cubic mm, or cubic cm

A

piston displacement

29
Q

volume of the cylinder when the piston is at TDC

A

clearance volume

30
Q

volume of the cylinder when the piston is at BDC

A

total volume

31
Q

how do you get the total volume?

A

add piston displacement and clearance volume

32
Q

ratio of total volume over clearance volume

A

compression ratio

33
Q

serve as a good source of power to perform diff kinds of farm operations

A

ICE

34
Q

devices that generate work using the products of combustion as the working fluid rather thanas a heat transfer medium

A

ICE

35
Q

commonly, diesel engines are used in what type of tractor to perform specific farm operations like in crop establishment processes?

A

two-wheel tractors

36
Q

a diesel engine is heavier and stronger than a gasoline engine of an equal hp because?

A

its materials are used to withstand the greater dynamic forces from higher combustion pressures present in the engine

37
Q

higher compression ratio results to greater combustion pressure

true or false

A

true

38
Q

measure of how much the engine compresses the gas in the cylinder

A

compression ratio

39
Q

lower ignition temp of gasoline will cause ignition at a CR of less than __:1

A

10

40
Q

in diesel engines, CR ranges from 14:1 to as high as 24:1

true or false

A

true

41
Q

higher CR of diesel engine is made possible because?

A

only air is compressed and then fuel is injected

ABE 2 First Exam (11 decks)

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