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41 Cards in this Set

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Jet Propulsion is defined as
A. A decrease in velocity and increase in pressure
B. The propelling force generated in the direction opposite to the flow of a mass of gas or liquid under pressure
C. the propelling force generated in the same direction of the flow of mass of gas or liquid under pressure
d. force x distance
B
Divergent Duct decreases the velocity and increases the pressure
True or False
True
Force is defined as
A. rate of doing work
B. capacity for doing work
C. action on a body that changes its state of motion
D. quanity of matter in a body measured in relation to its inertia
C
Mass is defined as
A. rate of doing work
B. capacity for doing work
C. action on a body that changes its state of motion
D. quanity of matter in a body measured in relation to its inertia
D
Power is defined as
A. rate of doing work
B. capacity for doing work
C. action on a body that changes its state of motion
D. quanity of matter in a body measured in relation to its inertia
A
Energy is defined as
A. rate of doing work
B. capacity for doing work
C. action on a body that changes its state of motion
D. quanity of matter in a body measured in relation to its inertia
B
The english measurement for mechanical power is
A. Slug
B. Horse power
C. Work
D. All of the above
B
Note Slug is a measuring unit for mass
Work = F X D. What do the F and D stand for?
Force times Distance
A Standard day Consists of
A. 0 Inch of mercury, 0% humidity and temp. of 59 degrees
B. 29.92 Inch of mercury, 0% humidity and a temp. of 69 degrees.
C. 29.92 Inch of mercury, 0% humidity and a temp. of 59 degrees.
C
More air arriving at the intake then the engine can ingest is
A. turbulence
B. Ram effect
C. friciton pressure loss
D. ram recovery
B
Note Ram recovery is the airspeed at which ram pressure rise is equal to friction pressure loss
What are Newtons three laws?
1st law-inertia
2nd law- force is proportional to the product of mass and acceleration
3rd law- for every action there is an opposite and equal reaction
Which of the following groups of jet engines as an ad will you be associated with most?
A. Rocket, turbojet, turboshaft, and turbo
B. turbojet, turboshaft, turboprops and turbofan
C. P-3, F-18, J-52 and props
D. none of the above
B
In the engine designation J79-GE-10 what does the 10 represent?
A. Basic Engine type
B. Manufacturer symbol
C. Model Number
D. Nothing
C
Note
J - basic engine type
79- is arbitrary
GE- manufacturer symbol
What are the four types of engines?
Turbojet, pulsejet, ramjet and rocket
Which of the following is a reason for proper air entrance (duct) design?
A. To reduce the ratio of compressor discharge pressure to duct inlet pressure
B. To increase the ratio of ram pressure to duct inlet turbulence
c. to reduce the ratio of ram pressure to duct inlet turbulence
D. To increase ram recovery while reducing pressure drops
D
During supersonic flight what major aircraft component can not withstand supersonic velocity airflow?
A. the tail section
B. The engine
C. the intake
D. the wings
B
The compressor's major function is to supply air to the combustion chamber in the proper quantity and pressure.
True or False
True
Note the secondary function of the compressor is to supply bleed air for various engine and aircraft systems.
A ten stage, axial flow compressor consists of what total number of rotors and stators
A. 5 and 5
B. 5 and 10
C. 10 and 10
D. 10 and 5
C
In an axial flow engine, by what means is high velocity, low pressure air converted to low velocity, high pressure air?
A. Action of a single intake diffuser
B. Action of stator blades at each stage of compression
C. Action of rotor blades at each stage of compression
D. Design of the intake
B
The Angle of attack is the angle at which airflow
A. strikes the rotor blade
B. strikes the stator blade
A
A stall due to an excess volume of air in the rear of the compressor is
A. choking
B. ground rpm limit
C. stalling
D. split spool
A
The 3 engine operating parameters that cause the airflow angle of attack to vary are engine rpm, compressor inlet temp. and compressor discharge pressure.
True or False
True
Guide vanes change the direction of the air entering and leaving the compressor in what manner?
A. By swirling it as it enters and leaves
B. By straightening it out as it enters and leaves
C. By swirling it as it enters and straightening it out as it leaves
D. By straightening it out as it enters and swirling it as it leaves.
C
What are the two common forms of blade roots?
Fir-tree and bulb
What is the primary function of the combustion section?
A. to provide ignition
B. to drive the turbine
C. to drive the compressor
D. to burn the fuel-air mixture
D
What percent of air entering the combustion chamber is mixed with fuel for combustion?
A. 40%
B. 75%
C. 25%
D. 100%
C
What percent of air serves as flame control?
75%
Which of the following is not a basic type of combustion chamber?
A. Annular
B. Can-Annular
C. Basket chamber
D. Multiple-chamber
C
What total number of combustion liners are used in jet engines using can-type combustion chambers?
A. 1 or 2
B. 6 or 7
C. 8 or 10
D. 11 or 13
C
What types of fuel nozzles are used in jet engines?
simplex and duplex
Note Duplex is most widely used
In the can type combustion chamber, where are the spark ignitor plugs located?
A. In the two lower chambers
B. In the right and left chambers
C. In the two upper chambers
D. All of the above
A
In the Can-type combustion chamber liner what is the purpose of the holes in the dome?
A. to help atomize fuel
B. to drain unburned fuel
C. to admit cooling air into the chamber
D. to admit primary air into the chamber
C
What is the main function of the inlet section of the annular combustion chamber?
To change velocity energy into pressure
or
to change velocity energy into mechanical energy
to change velocity energy in to pressure
The preswirl vanes in the can annular combustion chambers help to
A. reduce turbulence
B. mix the air and fuel
C. increase axial air velocity
B
The turbine converts velocity energy in to what?
A. mechanical energy
B. pressure
C. heat energy
A
The sole function of the turbine is to drive the compressor and accessories.
True or false
True
What is the function of the exaust section?
To direct hot gas out of the aircraft and increase exause gas temperature to obtain higher exaust velocity
or
to direct hot out of the aircraft while increasing velocity and preventing turbulence
To direct hot gas out of the aircraft and increase exause gas temperature to obtain higher exaust velocity
What part of the exaust section increases pressure and decreases velocity?
A. Exaust cone
B. inner cone
C. jet nozzle
A
Which of the following is an important function of the radial struts in the exaust cone assembly?
A. to straighten the exaust gases
B. to brace the exaust shroud
C. to increase the exaust gas pressure
D. to vary the size of the exaust opening
A
The size of the exaust section exit area directly effects the operating temp. of the engine and performance.
True or False
True
The primary function of the afterburner is
A. increase engine efficiency
B. increase thrust for specific conditions
C. to burn fuel not burned in the combustion chamber
B