Block 1

Question 1

What do all HEAT engines have in common?

Answer 1

The ability to convert fuel (chemical energy) into heat energy, and then into mechanical energy.

Question 2

Turbojet:

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 2

Means of Compression:
Turbine Driven

Engine Working Fluid:
Fuel/Air Mixture

Propulsive Working Fluid:
Fuel/Air Mixture

Question 3

Turbo Prop :

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 3

Means of Compression:
Turbine Driven

Engine Working Fluid:
Fuel/Air Mixture

Propulsive Working Fluid:
Ambient Air

Question 4

Ram Jet:

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 4

Means of Compression:
Ram Compression due to High Flight Speed

Engine Working Fluid:
Fuel/Air Mixture

Propulsive Working Fluid:
Fuel/Air Mixture

Question 5

Pulse-Jet

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 5

Means of Compression:
Compression due to Combustion

Engine Working Fluid:
Fuel/Air Mixture

Propulsive Working Fluid:
Fuel/Air Mixture

Question 6

Reciprocating Engine:

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 6

Means of Compression:
Reciprocating action of Engine

Engine Working Fluid:
Fuel/Air Mixture

Propulsive Working Fluid:
Ambient Air

Question 7

Rocket:

Means of Compression:
Engine Working Fluid:
Propulsive Working Fluid:

Answer 7

Means of Compression:
Compression Due TO Combustion

Engine Working Fluid:
Oxidizer/Fuel Mixture

Propulsive Working Fluid:
Same as. Engine Working Fluid

Question 8

Requirements for all engines:

REE

Answer 8

Reliability
Efficiency
Economy

Question 9

What is the useful output in all aircraft powerplants?

Answer 9

Thrust: which propels the aircraft forward.

Question 10

What is THP

Answer 10

Thrust Horsepower

Question 11

What is durability?

Answer 11

Amount of engine life obtained while maintaining desired amount of reliability.

Question 12

What is operating flexibility?

Answer 12

The ability of an engine to run smoothly and give desired performance at all speeds from idling to full power output.

Question 13

Types of Reciprocating Engines: (4)

Answer 13

In-Line
V-Type
Opposed
Radial

Question 14

Basic parts of reciprocating engines: (7)

CCCCVVP

Answer 14

Crank Case
Cylinders
Connecting Rods
Crank Shaft
Valves
Valve-operating mechanism
Pistons

Question 15

Parts of a Crank Shaft: (5)

Answer 15

Crankpin
CrankCheek
Counterweight
Dampening Weights
Journal

Question 16

When is a crankshaft statically balanced?

Answer 16

When the weight of the entire assembly of crankpins, crank cheeks, and counterweights is balanced around the axis of rotation.

Question 17

When is a crankshaft dynamically balanced?

Answer 17

When all of the forces created by crankshaft rotation and power impulses are balanced within themselves so little to no vibration is produced while engine is operating.

Question 18

What is a crank cheek?

Answer 18

Crank cheek connects crank pin to the main journal.

Question 19

What is a connecting rod?

Answer 19

The link that transmits forces between the piston and crankshaft.

Question 20

What do piston rings do?

Answer 20

Prevent leakage of gas pressure from combustion chamber and reduce to a minimum of seepage of oil into the combustion chamber.

Question 21

What is another name for piston pin?

Answer 21

Wrist Pin

Question 22

What does a piston pin used for?

Answer 22

Joins the piston to the connecting rod.

Question 23

What type of piston pin do modern engines have?

Answer 23

Full-Floating Type

Question 24

What does the compression ring do?

Answer 24

Prevents the escape of gas past the piston during engine operation

Question 25

What do oil control rings do?

Answer 25

Regulate the thickness of the oil film on the cylinder wall.

Question 26

Describe an oil scraper ring

Answer 26

Beveled Face Installed in a groove at the bottom of piston skirt Scraping edge is away from piston head

Question 27

Where is power developed in an engine?

Answer 27

Cylinders

Question 28

Parts of a Cylinder: CCSPIF

Answer 28

``` Cast aluminum Head Connecting Rods Intake Valve Spark Plugs Piston Forged Steel Barrel ```

Question 29

What is the purpose of cylinder heads?

Answer 29

To provide a place for combustion of fuel/air mixture and to give cylinder more heat conductivity for cooling.

Question 30

What are cylinder barrels made of typically?

Answer 30

Steel

Question 31

When steel soaks up nitrogen from the gas and forms iron nitrides in the exposed surface it's called.

Answer 31

Nitrided

Question 32

Cylinders worn and out of round can be groudn out to make them round again and re-nitrided OR

Answer 32

chrome plated

Question 33

Propeller shaft is always the ______ end. The acecssory end of the engine is the ______ end. Regardless of engine mounting.

Answer 33

Front | Rear

Question 34

Which valve operates at lower temperatures. | Intake or Exhaust

Answer 34

Intake