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Reciprocating Engine > Module 4 Inductions Systems > Flashcards

Module 4 Inductions Systems Flashcards

1
Q

Density

A

Density is define as the mass of and object divided by its volume

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2
Q

Boyle’s law

A

For a given mass, at constant temperature, the pressure x volume = Constant ( temperature)

Relationship between pressure and volume ( temperature is a constant)

p V = C

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3
Q

Charles Law

A

If the temperature is creases the volume also increases in order to maintain the same constant (pressure)

V= C T

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4
Q

Density Altitude

A

Pressure altitude corrected for non-standard temperature variations

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5
Q

Aircraft fuel metering systems sensing?

A

The volume of air entering the engine

  • no density
  • not amount of oxygen
  • not temperature
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6
Q

What effect would carb-heat have on the air/fuel mixture ?

A
  • Carb-heat heats the air
  • Heated air has less density
  • The same volume of heated air will gave less oxygen than Colleen air
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7
Q

What happens when an aircraft climbs altitude?

A
  • Mass of air will decrease with altitude, air becomes less dense
  • The same volume of air at altitude will have less oxygen than air at sea-level
  • Power reduction
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8
Q

Induction icing

A
  • Throttle ice
  • Fuel evaporating
  • Impact ice
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9
Q

Consequents of impact Icing ?

A
  • Power loss
  • Enriches the mixture fuel/air
  • Rough Running engine
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10
Q

Induction ice protection

A
  • Intake ice filter
  • Alternate Air
  • Carb-heat
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11
Q

What is MAP and where is measured

A

Maximum absolute pressure mesures in the induction system before the throttle valve

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12
Q

Engine operation in a clear cool day may become critical if the relative humidity is high because of?

A

Carburetor icing

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13
Q

Carburetor pre heater is not generally used on take off because of?

A
  • Loss power
  • Rough running engine
  • Detonation
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14
Q

If the carburetor air temperature is to high the probable result will be?

A

Loss power and detonation

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15
Q

Where is the “hot spot”

A

Oil sump

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16
Q

Two basic measurements that define standard day are?

A

29.92 HG and 15 Deg. C

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17
Q

How will an increase in carburetor air temperature effect the BMEP?

A

The heated air will decrease BMEP

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18
Q

What is Manifold Pressure?

A

Is the pressure in the intake manifold of the engine.

Weight of the fuel/air mixture entering the engine cylinders is measured by manifold pressure and the temperature of the mixture

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19
Q

What is the relationship between MAP and HP ?

A

Directly proportional, as manifold pressure increases, so does horse power

20
Q

What are the two main purpose for turbo-charging?

A
  • Maintain the sea-level horse Power to altitude

- Increase sea-level horse power

21
Q

Critical altitude is ?

A

The maximum altitude which sea-level horsepower can be maintained

22
Q

Boosted manifold pressure is any pressure above ?

A

-29.92 HG

23
Q

Super chargers are ___________ driven blowers

A

Engine

Mechanical-gear or belt

24
Q

Turbochargers are _______________ driven blowers?

A

Exhaust gas

25
Q

Excessive manifold pressure will result in ?

A

Rise in temperature of the charge and result in detonation if not controlled

26
Q

What is the difference between single stage- single speed supercharger; and single stage-two speed supercharger?

A

The speed of the blower can be changed on the single stage-tow speed supercharger for altitude operation

27
Q

Where Turbochargers are located?

A

Between the air intake and the fuel metering device

28
Q

What is upper deck pressure

A

Pressure after the blower but before throttle

29
Q

What is the purpose of the intercooler?

A

To reduce the temperature of the fuel/air mixture

30
Q

What are the 2 types of turbochargers systems ?

A
  • Normalized - works at higher altitudes not sea-level ( compensate for loss power at altitude)
  • Ground boosted-sea level up to critical altitude
31
Q

What is the purpose of the waste-gate valve ?

A

Control the amount of exhaust gas to the turbo system

32
Q

There is an oil flow restriction in the waste-Gate actuator, this restriction is located in the ?

A

Inlet of the waste-Gate actuator

33
Q

Automatic waste gate control main parts ?

A
  • Waste Gate actuator
  • Absolute pressure controller
  • Pressure Ratio Controller
  • Rate of change controller
34
Q

How waste actuator is controlled?

A

Spring pressure to open , oil pressure to close

35
Q

Maximum altitude a turbocharged engine can produce its rated horsepower ?

A

Critical altitude

36
Q

What is the upper pressure ?

A

From the compressor to the throttle

37
Q

The absolute Pressure controller functions to limit?

A

The maximum upper deck pressure

38
Q

To provide additional protection against an over boost condition many systems use a ?

A

Pressure relief valve

39
Q

The rate of the change controller functions to?

A

Limit the upper deck pressure from 2.0 to 6.5 HG/SEC m, to reduce turbine acceleration overboost

40
Q

The pressure controller setting is _______ times ambient pressure :

A

2.2 times ambient nacelle pressure

41
Q

Proper operation of the ratio controller can be determined only by flying the aircraft through?

A

16.000 feet density altitude

42
Q

The APC, rate of change and pressure ratio controllers, control de oil flow trough the waste gate actuator by sensing ?

A

Upper deck pressure

43
Q

The APC( absolute pressure controller) rate of change and pressure ratio controllers are connected by ?

A

Parallel

44
Q

The teledyne continental fuel injection pump uses and aneroid bellows to sense the upper deck pressure to prevent ?

A

An overly rich mixture upon rapid acceleration

45
Q

Density controller vs APC

A
  • Density controller- limit max MP
    - sense density

-APC -limit Max MP- sense the pressure

46
Q

Differential pressure controller vs VAPC

A

-Differential Pressure

Limits UDP to 6.5 “HG above the select MAP

Sense the UDP and MAP

-VAPC

Limits UDP to 2” Hg above selected MAP

Mechanical cam lobe to throttle setting

Reciprocating Engine (10 decks)

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