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Which of the following types of engine does NOT use atmospheric air for combustion?
Rocket
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The thrust developed by a ramjet engine is due to the increase in the air's
pressure
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What effect does a divergent duct have on airflow?
An increase in pressure and a decrease in velocity
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Which of the following statements is a definition of the term "force"?
Action on a body that changes its state of motion
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Which of the following statements is correct regarding mass and weight?
Mass is the quantity of matter; weight is the pull of gravity on that quantity of matter
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English measurement for mechanical power
Horsepower
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Measurement of force times distance
Work
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Capacity for doing work
Energy
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An engine exerting 1,375 pounds of force moves a vehicle 13.5 feet in 20 seconds. What total amount of work was accomplished?
18,562.5 foot-pounds
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To calculate the acceleration of a given mass, what symbol representing the force of gravity is normally used?
g
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A standard day at sea level is indicated by what condition?
20.02 inches of mercury, 0.00% humidity, and a temperature of 59.0 degrees Fahrenheit
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What happens to a slug of air as the temperature increases?
The molecules move faster, run into each other with more impact, and move further apart, decreasing air density
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What is the ram effect?
More air arriving at the engine intake than the engine can ingest
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Newton's First Law?
Inertia
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Newton's Second Law?
Acceleration
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Newton's Third Law?
Action/reaction
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In the formula F=MxA, which of the following is a measurement unit for M (mass)?
slugs
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Which of the following groups of jet engines will you, as an AD, be associated with most?
Turbofan, turbojet, turboprop, and turboshaft
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What total number of engine designation systems are presently in use?
Two
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BA?
Bell Aircraft Company
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In the engine designation J79-GE-10, what does the 79 indicate?
Air Force developed
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Which of the following engines has NOT completed the 150-hour qualification test?
YRJ35-LA-2
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Which of the following designations indicates an engine sponsored by the Navy?
J423-WA-402
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What is the MIL-STD-879 manufacturer's letter symbol for Allison Division, General Motors Corporation?
AD
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An Army-sponsored engine begins with what model number?
700
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What are the three parts of the MIL-STD-879 engine designation system?
Type indicator, manufacturer's symbol, and model indicator
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Which of the following is a reason for proper air entrance (duct) design?
To increase ram recovery while reducing pressure drops
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A single air entrance is more advantageous than a dual air entrance system for which of the following reasons?
It obtains maximum ram pressure
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Which of the following is NOT a problem caused by the use of dual intakes on single-engine aircraft?
More expensive construction materials
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During supersonic flight, what major aircraft component can NOT withstand supersonic velocity airflow?
the engine
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By which of the following methods do Navy aircraft diffuse intake air during supersonic flight?
By varying the area of the intake duct?
By using geometrically variable intake ducts?
By creating a shock wave in the intake duct?
All of the above
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What is the primary function of the compressor?
To suppy air to the combustion chamber iin the proper
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What is the advantage of a dual-entry centrifugal compressor as compared to a single-entry centrifugal compressor?
It can be made with a smaller diameter and handle the same airflow
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A 10-stage, axial-flow compressor consists of what total number of (a) rotors and (b) stators?
(a) 10 (b) 10
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In an axial-flow engine, by what means is high-velocity, low-pressure air converted to low-velocity, high-pressure air?
Action of stator blades at each stage of compression
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What is the most serious disadvantage of the axial-flow compressor?
High tendency to stall
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With reference to the axial-flow engine, the angle of attack is the angle at which the airflow
Strikes the rotor blades
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What three engine operating parameters cause the airflow angle of attack to vary?
Engine rpm, compressor-inlet temperature, and compressor discharge pressure
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Engine "choking" refers to which of the following terms?
Stall due to an excess volume of air in the rear of the compressor
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Which of the following is NOT considered by engine manufacturers as corrective action for a front-end, low-speed, high-temperature stall?
Installing a bleed valve(s) the middle of rear portions of the compressor section
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Guide vanes change the direction of the air entering and leaving the compressor in what manner?
By swirling it as it enters and straightening it out as it leaves
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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 from which of the following sources?
Different stages of the compressor, depending on the pressure and temperature needed
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What are two common forms of blade roots?
Fir-tree and bulb
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What is the profile of a compressor blade?
A cutout that reduces blade thickness
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What is the purpose of compressor blade profiles?
to allow the compressor blade tips to rub without causing serious damage
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Which of the following is a disadvantage of the axial-flow compressor?
High starting power needs
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Which of the following types of compressors provides greater starting flexibility and improved high-altitude performance?
Split-spool, axial-flow
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What is the primary function of the combustion section?
To burn the fuel-air mixture
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Approximately what percent of air entering the combustion chamber is mixed with fuel for combustion?
25%
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Approximately what percentage of air entering the combustion chamber serves as flame control/
75%
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Increasing fuel atomization (solution)
(problem) Carbon monoxide emission
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Improving primary zone fuel-air mixing (solution)
Visible smoke elimination (problem)
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During the combustion process, the emission levels of which of the following pollutants increases as the temperature increases?
Nitric Oxide
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Which of the following is NOT a basic element or system of combustion chambers?
Air pollution emission reduction
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Which of the following is NOT basic type of combustion chamber?
Basket-chamber
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Presently, what total number of combustion liners are used in jet engines using can-type combustion chambers?
8 or 10
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Which of the following types of fuel nozzles are used in jet engines?
Simplex and duplex
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