Reciprocating Engine Induction And Cooling System

Question 1

The basic induction system of an aircraft reciprocating engine consist of what component

Answer 1

Air scoop used to collect the inlet air and ducting that transfer the air to the inlet filter

Question 2

What are the three major parts of a reciprocating engine induction system?

Answer 2

Air scoop, fuel delivery system, and intake manifold

Question 3

What effect does the induction system icing have on engine performance?

Answer 3

Engine acting erratically, lose power, and possibly quit

Question 4

What method is used to prevent or remove induction system ice in a reciprocating engine

Answer 4

Heated air

Question 5

How is ice cleared in some aircraft induction system if the carbureto heat is too low to clear the ice

Answer 5

Alcohol is sprayed into the induction system ahead of the carburetor, the fluid will dislodged ice, which is ingested by the engine

Question 6

What engine indication can be the result of a dirty air filter?

Answer 6

low power

Question 7

What is the danger of using carburetor heat when operating a higher power setting?

Answer 7

Detonation and possible engine failure

Question 8

Carburetor throttle ice is most likely to form with the throttle is in which position

Answer 8

Partially close position

Question 9

What are the two general classification of superchargers used in a reciprocating engine induction system?

Answer 9

Internally driven or externally, driven supercharger system

Question 10

What is the purpose of distribution impeller in a radial engine?

Answer 10

To break up the fuel globules into a finer particles for better distribution to the cylinder

Question 11

How does a internal driven supercharger get its power?

Answer 11

Mechanically engine driven. High speed impeller is driven through a gear train from the crankshaft.

Question 12

Where does externally driven supercharger get its power

Answer 12

By the exhaust gases that are directed against the turbine, also known as turbochargers

Question 13

What unit regulates the amount of exhaust gases to the turbine of a turbocharger?

Answer 13

A waste gate

Question 14

What type of powered is used to control the position of the Turbocharger waste gate on some engines?

Answer 14

Oil pressure to an actuating piston

Question 15

What can cause waste gate to stick

Answer 15

Build up of carbon deposits

Question 16

What are the most common ways to control a waste gate?

Answer 16

Mechanical linkage to throttle or separate control, or by an actuator that is driven by the oil pressure.

Question 17

What causes fuel evaporation ice?

Answer 17

Decrease in air temperature resulting evaporation of fuel after it is introduced into the airstream

Question 18

What is the function of a Turbocharger waste gate?

Answer 18

Controls the volume of exhaust gas that is directed onto the turbine

Question 19

What may be the indication of leaking intake pipe?

Answer 19

Engine running rough

Question 20

What may be the indication of a turbo charger Waste gate will not close fully

Answer 20

Aircraft may not be able to reach critical altitude

Question 21

What could be the probable cause of a turbocharger engine that surges

Answer 21

Waste gate or controller malfunction

Question 22

What is used on many Turbocharger Engines for waste gate actuator power

Answer 22

Oil pressure

Question 23

How does divergent shape jet engine inlet affect, air flowing to the engine when the airplane is in subsonic flight?

Answer 23

Cause the air velocity to decrease and air pressure increase

Question 24

Bellmouth inlet ducts are used typically on what type of aircraft

Answer 24

Helicopter

Question 25

venturi type particle separator, found on many turbine powered helicopters, utilizes what characteristics of matter to help remove debris from induction air

Answer 25

Inertia

Question 26

What is the most common means of regulating the cooling air flow through a reciprocating engine?

Answer 26

Using cowl flaps

Question 27

what is the purpose of the fins on the engine cylinders?

Answer 27

To increase the surface area of the cylinder for cooling

Question 28

What other engine characteristics are designed to aid in engine cooling besides cooling fin

Answer 28

Baffles and engine cowling

Question 29

How is an engine designed to provide more cooling area?

Answer 29

The outer surface of the cylinder is increased by using cooling fins

Question 30

Why is the open and close adjustment during installation of cowl flaps important

Answer 30

Cowl flaps are set for a tolerance that will permit them to open and close in the correct amount to keep the cylinder head temperature within allowable limit

Question 31

What should be done to the cylinder when much of the cooling fins are broken off

Answer 31

Should be replaced because it cannot cool properly and hotspot would develop

Question 32

When should clow flap be kept in fully open position

Answer 32

During ground operation

Question 33

What power source are used to operate the cowl flaps

Answer 33

Electrical power, hydraulic power, or manually

Question 34

What is the purpose of a blast tubes

Answer 34

To direct jetS of cooling air to accessories of engine that have high heat concentrations. On radial engine they duct air onto the spark, plug elbows of each cylinder to prevent overheating of ignition leads

Question 35

what are the main reasons that excessive heat in a reciprocating engine is undesirable

Answer 35

 Shorten the life of engine parts, impairs lubrication, and affect combustion

Question 36

Describe the augmentor system

Answer 36

It is used to keep the temperature of air cooled engines down by using exhaust gas energy to draw cool air over the engine

Question 37

What is the source of air directed to the engine bearings for cooling?

Answer 37

Bleed air from the compressor section

Question 38

What is the purpose of insulation on the exhaust duct of a turbine engine?

Answer 38

To reduce the temperature of the structure in the vicinity of the exhaust duct or afterburner and to fuel oil coming in contact with the hot part of the engine

Question 39

What type of materials are used to make insulation blanket for a turbine engine?

Answer 39

Stainless steel, layers of aluminum foil, fiberglass, and silver foil

Question 40

What areas of a turbine engine are cool by the secondary air passing through the engine

Answer 40

 Combustion chamber and the turbines

Question 41

What is the purpose of a engine cowling?

Answer 41

it streamlines the engine to reduce drag and forms an envelope around the engine, which force is the airstream between the cylinders to cool them

Question 42

What is the purpose of a oil cooler bypass valve?

Answer 42

 Allows the thick oil to bypass the cooler when the oil is cold

Question 43

Where should a cowl flap be position during ground operation?

Answer 43

Fully opened

Question 44

What is the purpose of cowl flap air seal

Answer 44

They forced air to circulate around and through the baffle system

Question 45

Where must most cooling air flow to cool a turbine engine

Answer 45

 Through inside of the engine

Question 46

What areas of turbine engines are cool by air passing through the engine

Answer 46

The combustion chamber and turbine

Question 47

What is the relationship between turbine engine upper temperature limit and the power produced

Answer 47

The Higher combustion temperature that an engine could withstand without damage ,the more power is capable of producing

Question 48

What is the approximate percentage open air passing through a turbine engine that is used for cooling rather than combustion

Answer 48

75%