Aviation Machinist’S Ad3 And 2 14008 Assignment 1

Front 1

Which of the following types of
engine does NOT use atmospheric air
for combustion?

Back 1

rocket

Front 2

The thrust developed by a ramjet
engine is due to the increase in the
air’s

Back 2

temperature

Front 3

What effect does a divergent duct
have on airflow?

Back 3

An increase in pressure and a
decrease in velocity

Front 4

Which of the following statements is
a definition of the term “force”?

Back 4

Action on a body that changes
its state of motion

Front 5

Which of the following statements is
correct regarding mass and weight?

Back 5

Mass is the quantity of matter;
weight is the pull of gravity on
that quantity of matter

Front 6

Rate of doing
work

Back 6

power

Front 7

English
measurement
for mechanical
power

Back 7

horsepower

Front 8

measurement of force times distance

Back 8

work

Front 9

capacity for doing work

Back 9

energy

Front 10

An engine exerting 1,375 pounds of
force moves a vehicle 13.5 feet in
20 seconds. What total amount of
work was accomplished?

Back 10

18,562.5 foot–pounds

Front 11

To calculate the acceleration of a
given mass, what symbol representing
the force of gravity is normally
used?

Back 11

a

Front 12

A standard day at sea level is
indicated by what condition?

Back 12

29.92 inches of mercury, 0.00%
humidity, and a temperature of
59.0°F

Front 13

What happens to a slug of air as the
temperature increases?

Back 13

The molecules move faster, run
into each other with more
impact, and move further apart,
decreasing air density

Front 14

What is the ram effect?

Back 14

More air arriving at the engine
intake than the engine can
ingest

Front 15

In the formula F = M x A, which of
the following is a measurement unit
for M (mass)?

Back 15

slugs

Front 16

Which of the following groups of jet
engines will you, as an AD, be
associated with most?

Back 16

Turbofan, turbojet, turboprop,
and turboshaft

Front 17

What total number of engine
designation systems are presently in
use?

Back 17

three

Front 18

In the engine designation J79-GE-10,
what does the 79 indicate?

Back 18

air force developed

Front 19

Which of the following engines has
NOT completed the 150-hour
qualification test?

Back 19

T34–P-3

Front 20

Which of the following designations
indicates an engine sponsored by the
Navy ?

Back 20

J423-WA-402

Front 21

What is the MIL-STD-879
manufacturer’s letter symbol for
Allison Division, General Motors
Corporation?

Back 21

AD

Front 22

An Army-sponsored engine begins with
what model number?

Back 22

700

Front 23

What are the three parts of the
MIL-STD-879 engine designation
system?

Back 23

Type indicator, manufacturer’s
symbol, and model indicator

Front 24

Which of the following is a reason
for proper air entrance (duct)
design?

Back 24

To increase ram recovery while
reducing pressure drops

Front 25

A single air entrance is more
advantageous than a dual air
entrance system for which of the
following reasons?

Back 25

It obtains maximum ram pressure

Front 26

Which of the following is NOT a
problem caused by the use of dual
intakes on single-engine aircraft?

Back 26

More expensive construction
materials

Front 27

During supersonic flight, what major
aircraft component can NOT withstand
supersonic velocity airflow?

Back 27

engine

Front 28

By which of the following methods do
Navy aircraft diffuse intake air
during supersonic flight?

Back 28

By creating a shock wave in the
intake duct

Front 29

What is the primary function of the
compressor?

Back 29

To supply air to the combustion
chamber in the proper quantity
and pressure

Front 30

What is the advantage of a dual–
entry centrifugal compressor as
compared to a single-entry
centrifugal compressor?

Back 30

It rotates at lower speeds

Front 31

A 10-stage, axial-flow compressor
consists of what total number of (a)
rotors and (b) stators?

Back 31

(a) 10 (b) 10

Front 32

In an axial-flow engine, by what
means is high-velocity, low-pressure
air converted to low-velocity, highpressure
air?

Back 32

Action of stator blades at each
stage of compression

Front 33

What is the most serious
disadvantage of the axial-flow
compressor?

Back 33

High tendency to stall

Front 34

With reference to the axial-flow
engine, the angle of attack is the
angle at which the airflow

Back 34

strikes the rotor blades

Front 35

What three engine operating
parameters cause the airflow angle
of attack to vary?

Back 35

Engine rpm, compressor–inlet
temperature, and compressor
discharge pressure

Front 36

Engine “choking” refers to which of
the following terms?

Back 36

Stall due to an excess volume of
air in the rear of the
compressor

Front 37

Which of the following is NOT
considered by engine manufacturers
as corrective action for a frontend,
low-speed, high-temperature
stall?

Back 37

Increasing compressor loads
through the use of variable–area
exhaust nozzles

Front 38

Guide vanes change the direction of
the air entering and leaving the
compressor in what manner?

Back 38

By swirling it as it enters and
straightening it out as it
leaves

Front 39

Bleed air for unloading the
compressor during starting, cockpit
pressurization and heating, engine
anti-icing, fuel tank
pressurization, and various other
purposes is tapped from which of the
following sources?

Back 39

Different stages of the
compressor, depending on the
pressure and temperature needed

Front 40

What are two common forms of blade
roots?

Back 40

fir tree and bulb

Front 41

What is the profile of a compressor
blade?

Back 41

A cutout that reduces blade
thickness

Front 42

What is the purpose of compressor
blade profiles?

Back 42

To allow the compressor blade
tips to rub without causing
serious damage

Front 43

Which of the following is a
disadvantage of the axial-flow
compressor?

Back 43

High starting power needs

Front 44

Which of the following types of
compressors provides greater
starting flexibility and improved
high–altitude performance?

Back 44

Split-spool. axial–flow

Front 45

What is the primary function of the
combustion section?

Back 45

To burn the fuel-air mixture

Front 46

Approximately what percent of air
entering the combustion chamber is
mixed with fuel for combustion?

Back 46

25%

Front 47

Approximately what percentage of air
entering the combustion chamber
serves as flame control?

Back 47

75%

Front 48

increasing the fuel atomization

Back 48

carbon monoxide emission

Front 49

improving primary zone fuel air mixing

Back 49

visible smoke elimination

Front 50

During the combustion process, the
emission levels of which of the
following pollutants increases as
the temperature increases?

Back 50

Nitric oxide

Front 51

Which of the following is NOT a
basic element or system of
combustion chambers?

Back 51

Air pollution emission reduction

Front 52

Which of the following is NOT a
basic type of combustion chamber?

Back 52

Basket–chamber

Front 53

Presently, what total number of
combustion liners are used in jet
engines using can–type combustion
chambers?

Back 53

8 or 10

Front 54

Which of the following types of fuel
nozzles are used in jet engines?

Back 54

Simplex and duplex