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powerplant > M > Flashcards

M Flashcards

1
Q

What are the two types of carburetors most commonly used on small reciprocating engines?

A

Float, tight carburetor and pressure type carburetor

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2
Q

What is the function of a mixture control on a float type carburetor?

A

Control fuel air mixture

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3
Q

what is the action of a float type carburetor accelerating system, when the throttle is open with a quick action

A

Fuel will enrich the mixture in the venture

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4
Q

When does a carburetor economizer system needle valve begin to open

A

60 to 70 percent of rated power

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5
Q

What is the purpose of a carburetor economizer system?

A

Provide additional fuel at high power settings

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6
Q

Where does depress injection carburetor obtain fuel pressure

A

Engine driven fuel pump

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7
Q

what operates the automatic major control?

A

Sealed bellows, that contract or expand with pressure and temperature change

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8
Q

What position of a pressure injection carburetor manual mixture control would stop engine Operation

A

idle cutoff position

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9
Q

Name at least three advantages of direct fuel injection systems over conventional carburetor systems

A

let’s danger of induction icing, improved acceleration, better fuel economy

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10
Q

In a reciprocating engine, what problem is caused by an excessively rich mixture at idle

A

spark, plug, fouling

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11
Q

What is the RPM indication when an idle measure is set correctly and the mission control is placed to the idle cut off position

A

Slight rise in RPM prior to decreasing

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12
Q

we should engine RPM be accelerator periodically when making carburetor adjustments

A

Clear the engine

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13
Q

What is the function of a turban ed and fuel control unit?

A

automatically satisfies fuel requirements of the engine

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14
Q

What are the three basic types of turbine engine fuel control units

A

hydro mechanical, electronic, and FADEC

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15
Q

name at least three of the engine variables that may be detected by a turban engine, fuel control unit

A

Engine, RPM, compressor inlet temperature, compressor inlet pressure

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16
Q

What are two sources used in turbine engine fuel systems for fuel heating?

A

Bleeder and engine oil

17
Q

what turban engine component inject fuel into combustion areas

A

Fuel spray nozzles

18
Q

Depending on the particular engine trimming is accomplished, according to one of two types of indications what are they?

A

EPR and RPM

19
Q

name two major components of a supervisory, electronic engine control

A

Electronic control unit and Hydro mechanical fuel control

20
Q

what are the maintenance adjustments? Normally allowed on installed Hydro mechanical fuel control

A

Specific gravity, for the fuel, idle RPM, and maximum RPM

21
Q

name at least two advantages of a full authority, digital electronic control over a Hydro mechanical fuel control

A

Improved engine, starts and saves fuel

22
Q

What is the purpose of a turban engine driven fuel pump?

A

Delivery continue supply fuel at proper pressure at all times

23
Q

What are two categories of turban engine fuel pumps

A

Constant and variable displacement

24
Q

A gear type pump is classified in what category

A

Constant displacement

25
Q

What happens to excess fuel not required by an engine in a constant displacement pump

A

Pressure relief valve bypasses exit excess fuel

26
Q

what is the purpose of pressurizing portion of a pressurizing and dump valve?

A

provide primary and secondary fuel to dual line, duplex, fuel nozzles

27
Q

what is the purpose of a fuel boost pump?

A

Provide fuel to engine driven fuel pumps

28
Q

what does the use of fuel boost pumps help prevent?

A

Cavitation and vapor lock

29
Q

what are the causes of vapor lock?

A

Low fuel pressure, high fuel temperatures and excessive fuel turbulence

30
Q

Why is vapor lock serious?

A

The fuel flow may be completely blocked

31
Q

where are the purposes of main fuel strainers?

A

collect water sediment, and keep foreign matter out of the carburetor

32
Q

what unit in a turban engine fuel system is susceptible to the formation of ice

A

Fuel filter

33
Q

what is the safety feature in the engine fuel system micron filter

A

Bypass valve

34
Q

What methods are most often used to prevent ice in Turban engine fuel filters

A

Heat from bleed air or engine lubricating oil

35
Q

what do the divided fuel flows of a turban engine, duplex, fuel nozzle produce in the fuel?

A

Two spray patterns

36
Q

what do the divided fuel flows of a turban engine, duplex, fuel nozzle produce in the fuel?

A

Two spray patterns

powerplant (11 decks)

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