Reciprocating Engine Induction Systems

Question 1

The 4 typical components of an induction system on a normally aspirated engine

Answer 1

1. Air intake 2. Air filter 3. Fuel metering system 4. Induction manifold

Question 2

The reason for why air-intakes/ air scoops are located in the propeller slip stream

Answer 2

The propeller slipstream has higher velocity that can be used for RAM air into the air scoops

Question 3

The term for the ducting from the fuel metering device to the individual cylinders

Answer 3

description of the intake manifold

Question 4

On some piston engines, the reason why the intake manifold would be routed through the oil sump before branching off into each cylinder

Answer 4

To increase the temp of the gas and make it easier to vaporize

Question 5

The 3 forms of ice associated with an induction system on a piston engine

Answer 5

1. Throttle 2. Fuel vapor icing 3. Impact

Question 6

When visible moisture is striking an aircraft and then freezing

Answer 6

Definition of impact ice

Question 7

The first indication of ice in the induction system

Answer 7

A reduction of engine power

Question 8

Condition in a piston engine which will start off as a loss in engine speed followed by engine roughness ina fixed pitch propeller

Answer 8

Intake manifold icing

Question 9

How intake manifold icing is first evidenced on a CONSTANT SPEED PROPELLER

Answer 9

Reduction in MAP with no change in engine speed

Question 10

The system which ducts unfiltered air from within the engine cowling through a sheet metal shroud surrounding the exhaust pipe

Answer 10

Description of carburetor heat

Question 11

The relationship between volumetric efficiency and carburetor heat

Answer 11

When carburetor heat is on, the air is less dense, the mixture becomes richer, and the volume of air displaced by the cylinder is reduced

Question 12

The method that a super charger is typically driven by

Answer 12

Crankshaft via a gear train

Question 13

The draw back of a super charger

Answer 13

The useage of large amounts of the engines power for the power increase

Question 14

The method of which turbochargers are powered

Answer 14

Exhaust gasses from the engine used for compression purposes

Question 15

Definition of Critical Altitude

Answer 15

Maximum altitude that a turbocharged engine can produce its rated horsepower under standard atmospheric conditions

Question 16

The method by which turbocharger bearings are cooled

Answer 16

Engine oil in the turbocharger bearing housing

Question 17

After air hot air leaves the turbo charger, the method of cooling the air before entering the cylinder to prevent _________

Answer 17

Intercooler, detonation

Question 18

Times to switch on the carburetor heat

Answer 18

1. Switch on when flying into known icing conditions 2. Switch on when ever there is a power reduction

Question 19

The reason why carburetor heat should be switched on whenever there is a power reduction

Answer 19

With a reduction of throttle position and power, there is less hot air radiating from the engine to clear ice in the venturi

Question 20

Difference between where Piper and Cessna aircraft get their carburetor heat from

Answer 20

Piper- warm air from behind the cylinder heads Cessna- warm air from the heat exchanger around the exhaust pipes

Question 21

In a normally aspirated piston engine, the heater muff is essentially a_____ ______

Answer 21

heat exhanger

Question 22

On carburetor engines, the location of the alternate air supply door

Answer 22

Alternate air supply door is located in the Carburetor air box

Question 23

Identify parts

Answer 23

1. Air filter
2. Temperature probe
3. Drain line
4. Spring loaded Alternate air door

Question 24

The type of piston engines which use alternate air doors

Answer 24

Fuel injection engines

Question 25

What is this?

Answer 25

Carburetor Air box

Question 26

Cessna or Piper?

Answer 26

Piper

Question 27

Cessna or Piper?

Answer 27

Cessna

Question 28

A supercharger can increase the engine's volumetric effeciecny up to

Answer 28

100% volumetric efficiency

Question 29

Where the MAP gauge SENSOR is located on all supercharged aircraft and why

Answer 29

Located just after the supercharger Provides more accurate picture of engine performance

Question 30

The downside of the early ground boost blowers (sea level superchargers)

Answer 30

The engine power output still decreased with an increase in altitude

Question 31

The difference between internally driven super chargers and externally driven super chargers

Answer 31

Internal compress the fuel/air mixture External compress the air

Question 32

The 2 components of a cettrifugal compresseor

Answer 32

1. Impeller 2. Diffuser

Question 33

The purpose of an impeller

Answer 33

To increase air velocity

Question 34

The purpose of a difuser in a turbcharger

Answer 34

TO convert the kinitc energy of the air stream into pressure energy

Question 35

The vanes in an impeller form what kind of shape

Answer 35

divergent

Question 36

Since the turbochrger gets hot during operation, how is it cooled

Answer 36

Engine oil pumped through the bearing housing

Question 37

The flow rate of oil going through the turbo charger bearing housing

Answer 37

5 gallons per minute

Question 38

The two methods of reducing the density loss of due to adiabatic heating through the turbo charger

Answer 38

1. Passing massflow through an intercooler 2. Spraying the fuel/air mixture from the carbureator through the eye of the impeller to reduce temperature

Question 39

Aircraft that have super chargers/ turbo chargers typically have what kind of propeller?

Answer 39

Constant speed

Question 40

What gauge in the cockpit is used for the pilot to know how much pressure is inside the manifold on an engine using a turbo/ super charger?

Answer 40

Manifold Absolute pressure gauge

Question 41

Pressure ratio of an impeller compresser turbo charger increases as

Answer 41

It's speed increases

Question 42

How does the impeller/ turbo charger compensate for the loss of density at altitude being that it must maintain a constant mass of air

Answer 42

The impeller rotates faster via the wastegate controller

Question 43

What is the position of the wastegate controller at critical altitude and why?

Answer 43

Mostly Closed (not fully to prevent it from being stuck) to ensure more exhasut goes over the turbine to increase compresser speed to compenate for density loss at altitude

Question 44

Waste gate contorllers can be controled\_\_\_\_\_\_\_ or \_\_\_\_\_\_\_\_\_

Answer 44

manually or automatically

Question 45

What is the means of actuating the waste gate controller

Answer 45

Engine oil and spring

Question 46

What are the 6 types of Waste gate actuator controllers

Answer 46

1. Absolute pressure controller 2. Pressure ratio controller 3. Rate of change controller 4. Differntial presure controller 5. Density controller 6. Variable pressure controller

Question 47

The APC uses a _____ to sense compresser outlet pressure

Answer 47

aneroid capsule

Question 48

Position that the APC places the wastegate at low power setting

Answer 48

Fully closed

Question 49

The purpose of the Automatic pressure controller in a Turbo charger system

Answer 49

Maintain preset Manifold pressure

Question 50

The type of contorller in a Turbocharging system which prevents bootstrapping at part throttle conditions

Answer 50

Differneital pressure control

Question 51

Type of controller which senses and maintains pressure between the compresser outlet and the inlet mainfold on a turbocharged engine

Answer 51

Differnetial pressure controller

Question 52

Type of contoller used to control waste gate operation when the throttle is fully opened and limits the maximum manifold pressure

Answer 52

Density pressure controller

Question 53

The desnity controller in a turbo charged engine contains _____ gas which senses both the ______ and _____ of the compresser outlet air

Answer 53

nitrogen gas, temperture and pressure

Question 54

Why does the density controller in a turbocharged engine increases the compresser outlet pressure

Answer 54

Reduction of pressure casued by an increase in temperature casused by the turbine and compresser having to work harder as the airraft climbs

Question 55

The desnity controller in a turbo charged engine will ensure that the aircraft maximum avaible density will increase up to

Answer 55

critical altitude

Question 56

The type of pressure contoller found on turbo charged aircraft which uses a cam that is linked to the throttle to control the engine bleed oil from the wastegate actuator

Answer 56

variable pressure controller

Question 57

The pressure controller on a turbo charged engine which will govern MAP pressure when the throttle is opened rapidly

Answer 57

Rate of change pressure controller

Question 58

Pressure controller used on a turbo charged engine which limits comrpesser deliviery( air charge temperature) at high altitude to prevent detonation

Answer 58

Pressure ratio controller

Question 59

Wastegate actuators are spring loaded to the ______ position

Answer 59

fully open

Question 60

Prior to engine start, what must the position of the waste gate actuator be in

Answer 60

Fully open