New Powerplant

Question 1

What is the most critical lubrication point in a gas turbine engine?

Answer 1

The turbine bearing

Question 2

Why is an oil tank required to have expansion space?

Answer 2

To provide for thermal expansion and air in the return oil.

Question 3

Name one type of filter used on aircraft engines

Answer 3

Screen , cuno , canister or spin-on

Question 4

The basic induction system of an aircraft reciprocating engine consists of what components?

Answer 4

Air scoop used to collect the inlet air,
Ducting that transfer the air to the inlet filter

Question 5

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

Answer 5

Either mechanically with linkages to the throttle,
Or an actuator driven by oil pressure.

Question 6

What causes fuel evaporation ice ?

Answer 6

By decrease in air temperature resulting from evaporation of fuel after it is introduced into the airstream.

Question 7

What is the function of the turbocharger waste gate?

Answer 7

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

Question 8

What may be the indication of leaking intake pipes?

Answer 8

Engine runs rough

Question 9

What may be the indication if a turbocharger waste gate will not close fully?

Answer 9

Aircraft can not reach critical altitude

Question 10

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

Answer 10

Waste gate or controller malfunction

Question 11

What is used on many turbocharged engines for the waste gate actuator power?

Answer 11

Oil pressure

Question 12

How does a divergent shaped jet engine inlet affect the air flowing to the engine when an airplane is in subsonic flight ?

Answer 12

Air velocity decrease and air pressure increase

Question 13

Bellmouth inlet ducts are used typically on what type of aircraft ?

Answer 13

Helicopters

Question 14

Where should cowl flaps be positioned during ground operations?

Answer 14

Fully open

Question 15

What is the purpose of cowl air seal?

Answer 15

They force air to circulate around and through the baffle system

Question 16

Where must most cooling air flow to cool a turbine engine ?

Answer 16

inside of the engine

Question 17

What areas of a turbine engine are cooled by air passing through the engine?

Answer 17

The combustion chamber and turbine

Question 18

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

Answer 18

The higher the combustion temperatures that an engine can withstand without damage. The more power it is capable of producing.

Question 19

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

Answer 19

75%

Question 20

What are two general types of exhaust systems in use on reciprocating aircraft engines?

Answer 20

Short stack (open )system and collector system

Question 21

What material is used to make exhaust system muffler shrouds?

Answer 21

Stainless steel

Question 22

What drawback in using collector type exhaust systems is more than offset when used on turbocharged engines?

Answer 22

The loss of horsepower due to exhaust system back pressure

Question 23

Why are turbocharged exhaust system leaking very damaging at high altitudes?

Answer 23

Pressure differential will cause the leak to escape with torchlike intensity

Question 24

What are the components of a typical turbine exhaust nozzle?

Answer 24

A tail cone, exhaust duct, and support struts

Question 25

The propeller control system is divided into two type of control, what are they?

Answer 25

One for fight, one for ground operations

Question 26

How are wooden propellers cleaned?

Answer 26

Soap and water

Question 27

How do you determine the reparability of a damaged propeller blade?

Answer 27

Manufactures maintenance manual

Question 28

When engine vibration is reported, what should be checked to determine if it is caused by the engine or the propeller?

Answer 28

Blade tracking and blade angle setting

Question 29

What positions of a two blade propeller are used during a static balance test ?

Answer 29

Vertical and horizontal

Question 30

What three things does a typical constant speed propeller governor accomplish when operating ?

Answer 30

1. Boosts engine oil pressure before it enters propeller hub
2. Controls the oil that flows to propeller
3. Sense rotational speed of the engine