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100 Cards in this Set
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"An unbalanced force on a body produces or tends to produce an acceleration in the direction of the force and that the acceleration, if any, is directly proportional to the force and inversely proportional to the mass of the body." This statement is
a. Bernoulli's principle b. Newton's first law of motion c. Newton's second law of motion d. Newton's third law of motion |
c. Newton's second law of motion
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Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?
a. Elbow b. Straight c. Divergent d. Convergent |
c. Divergent
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"The combination of decreased pressure above an airfoil, and the increased pressure below the airfoil produces lift." is BEST described by
a. Bernoulli's principle b. Newton's first law of motion c. Newton's second law of motion d. Newton's third law of motion |
d. Newton's third law of motion
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The tendency of an object at rest to remain at rest and the tendency of an object in motion to continue its motion in a straight line at the same speed is called
a. energy b. inertia c. friction d. potential |
b. Inertia
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Which section of a jet engine introduces and burns fuel?
a. Turbine b. Diffuser c. Compressor d. Combustion |
d. Combustion
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Which section of a jet engine keeps the compressor rotating?
a. Turbine b. Exhaust c. Diffuser d. Combustion |
a. Turbine
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Which method of producing thrust does a turboprop engine use?
a. Accelerating a large mass of air by a small amount b. Moving a small quantity of air through a large velocity change c. Using the same working fluid for propulsive force as that used within the engine d. Using only the energy expended through the exhaust nozzle to propel the aircraft forward |
a. Accelerating a large mass of air by a small amount
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Which type of horsepower is delivered to the propeller for useful work?
a. Brake b. Indicated c. Frictional d. Equivalent shaft |
a. Brake
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The heat content per pound of kerosene is how many Btu's?
a. 10,500 b. 15,000 c. 18,500 d. 40,000 |
c. 18,500
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To measure barometric pressure, you would use a
a. potentiometer b. psychrometer c. pyrometer d. barometer |
d. barometer
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What is the sea-level atmospheric pressure at "standard day" conditions?
a. 13.5 psi b. 14.7 psi c. 49.94 psi d. 40.55 psi |
b. 14.7 psi
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What effect does the divergent design of a diffuser have on air pressure?
a. Increases pressure b. Decreases pressure c. Has no effect on pressure d. Results in pressure fluctuations |
a. Increases pressure
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Which engine component METERS fuel for combustion?
a. P&D valve b. Fuel pump c. Fuel control d. Fuel nozzles |
c. Fuel control
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What directs the gases onto the FIRST-stage turbine wheel blades in a jet engine?
a. Flameholder b. Combustion chamber c. Turbine wheel blades d. Turbine stator |
d. Turbine stator
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When two or more turbine wheels are used in a jet engine, which component is placed directly in front of each turbine wheel?
a. Diffuser b. Jet nozzle c. Combustion chamber d. Turbine stator (nozzle diaphragm) |
d. Turbine stator (nozzle diaphragm)
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The three MAJOR sections of all jet engines are compressor, combustion, and
a. turbo b. turbine c. exhuast d. diffuser |
b. Turbine
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Vane-type fuel pumps used in jet engines are similar to
a. sliding-vane air compressors b. piston pump air compressors c. roots air compressors d. turbo-superchargers |
a. sliding-vane air compressors
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The two forces that air is subjected to after it is drawn into the guide vanes of a centrifugal compressor are
a. rotational and centrifugal b. rotational and tangential c. tangential and centrifugal d. tangential and radial |
a. rotational and centrifugal
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A constructional feature of the centrifugal compressor is that the impeller
a. has two matching plates b. has a lightweight design c. is forged as a single unit d. is constructed in rows of blades and stators |
c. is forged as a single unit
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The forward end of the shaft on a centrifugal compressor is hollow in order to
a. act as a vibration damper b. allow cooling air to the turbine c. provide a passage for lubricating oil d. provide a passage for the main fuel supply |
d. provide a passage for the main fuel supply
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Stationary vanes positioned between rotor discs in a compressor are used to
a. direct air and increase pressure b. direct hot gases rearward c. increase backup pressure d. prolong compressor life |
a. direct air and increase pressure
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In a dual-spool compressor, rpm of the N2 compressor are determined by the
a. starter b. fuel pump c. fuel control d. low-pressure turbine |
c. fuel control
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Which facet of engine design helps prevent igniter plug fouling?
a. Gold plating on the plug b. Split electrode on the plug c. Ceramic coating on the plug d. Directing air around the plug |
d. Directing air around the plug
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The excess airflow that is NOT burned in the combustion section is used to
a. cool the burner surfaces b. operate pneumatic accessories c. decrease the mass of exhaust gases d. increase air in the compressor section |
a. cool the burner surfaces
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Fuel that accumulates after a failed start is
a. returned to the fuel control by tubes b. drained overboard by a drain system c. burned on the next start attempt d. allowed to evaporate |
b. drained overboard by a drain system
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The parts on a can-annular combustion section must be removed in a specific order because of the
a. fuel nozzle b. transition liner c. combustion chamber outer case d. combustion chamber crossover tubes |
d. combustion chamber crossover tubes
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What is the MOST COMMON type of fuel nozzle system?
a. Pressure-atomizing b. Fuel-blasting c. Fuel-ejector d. Fuel tube |
a. Pressure-atomizing
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Swirl-type fuel nozzles USUALLY are used to provide what type of flame speed?
a. Low b. High c. Medium d. Medium-high |
b. High
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Three types of turbine and vane assemblies used in jet engines are impulse, reaction, and
a. fir tree b. shrouded c. unshrouded d. reaction-impulse |
d. reaction-impulse
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What is placed in front of the rotating blades in an engine turbine section?
a. Rotating vanes b. Inlet guide vanes c. Turbine rotating vanes d. Turbine nozzle vane assembly |
d. Turbine nozzle vane assembly
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Why is the "fir tree" method of attaching turbine blades (buckets) to the turbine rotor disc preferred?
a. There is a significant temperature differential between the turbine rotor disc and the blades b. This method aids in preventing horizontal movement of the blades c. This method aids in preventing axial movement of the bucket d. There is more blade tip shake during engine operation |
a. There is a significant temperature differential between the turbine rotor disc and the blades
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The exhaust duct connects the turbine outlet and the
a. fan duct b. jet nozzle c. fuel nozzle d. bifurcated duct |
b. jet nozzle
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The purpose of the exhaust duct is to
a. swirl exhaust gas-flow b. equalize exhaust gas-flow c. straighten exhaust gas-flow d. modulate exhaust gas-flow |
c. straighten exhaust gas-flow
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The purpose of an augmentor (afterburner) in a jet engine is to
a. increase engine rpm b. reduce pressure drop c. augment basic engine thrust d. increase EGT |
c. augment basic engine trust
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How many different types of loads can be imposed on a jet engine bearing?
a. Two b. Three c. Four d. Five |
b. Three
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When you handle jet engine bearings, you must change cotton gloves frequently because they
a. wear faster b. attract dirt c. cause oxidation d. get soaked with sweat |
d. get soaked with sweat
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Before inspecting new jet engine bearings, you should
a. separate the halves b. apply a preservative c. perform a spin check d. remove the preservative coating |
d. remove the preservative coating
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The bearing removal tools that are MOST COMMONLY used include
a. drift pipes and hammers b. bearing pullers and hammers c. drift pipes and arbor presses d. arbor presses and bearing pullers |
d. arbor presses and bearing pullers
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Which type of defect appears on bearings as a result of bearing parts striking together?
a. Nicks b. Galling c. Grooves d. Scratches |
a. Nicks
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Which type of defect appears on bearings as a result of small particles of foreign material becoming lodged between the rollers?
a. Pits b. Bands c. Grooves d. Brinelling |
c. Grooves
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Excessive bearing wear can usually be detected by
a. pits b. bands c. misalignment d. roughness of the metal |
d. roughness of the metal
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The recommended method of heating inner races of bearings before installing them is
a. hot-oil bath b. portable heater c. bearing furnace d. hydraulic oil bath |
a. hot-oil bath
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Which component reduces the engine rotor speed to the rpm required for accessories?
a. Step motors b. Reduction motor c. Reduction geartrain d. Gear case drive assembly |
c. Reduction geartrain
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On an F108 engine, the radial drive shaft connects the core engine to the
a. hydraulic actuator motor b. accessory drive assembly c. variable bleed valves d. fan booster rotor |
b. accessory drive assembly
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The MAJOR sections of a turboprop engine are the power unit, torquemeter assembly and
a. turbine assembly b. compressor assembly c. combustion assembly d. RGB assembly |
d. RGB assembly
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On the T56 turboprop engine, how many stages of reduction are in the RGB's MAIN reduction gear train?
a. 1 b. 2 c. 3 d. 4 |
b. 2
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On the T56 turboprop engine, what is the OVERALL reduction ratio of the RGB's MAIN reduction gear train?
a. .3125 to 1 b. 4.333 to 1 c. 13.54 to 1 d. 13,820 to 1 |
c. 13.54 to 1
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On the T56 turboprop engine, there are mounting pads on the aft side of the accessory drive for the fuel control, fuel pump, and
a. speed-sensitive valve b. engine main oil pump c. speed-sensitive control d. external scavenge oil pump |
d. external scavenge oil pump
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On the T56 turboprop engine, which compressor section assembly disperses compressor discharge air and directs it to the combustion chambers?
a. Diffuser b. Compressor rotor c. Compressor housing d. Compressor air inlet housing |
a. Diffuser
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In the T56 engine, which RGB component rotates at the same speed as the power unit rotors?
a. Sun gear b. Ring gear c. Main drive gear d. Pinion input gear |
d. Pinion input gear
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What is the TOTAL gear reduction ratio of the RGB?
a. 3.125:1 b. 4.333:1 c. 12.85:1 d. 13.54:1 |
d. 13.54:1
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What is NOT a propeller brake position?
a. Locked b. Applied c. Engaged d. Released |
c. Engaged
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The propeller brake is in which position when the aircraft is on the ground and the engine is stopped?
a. Locked b. Applied c. Engaged d. Released |
b. Applied
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Which valve in the propeller control assembly is actuated by the NTS actuator rod to increase propeller blade angle?
a. Pilot b. Feather c. Beta backup d. Alpha backup |
b. Feather
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Which components comprise the torquemeter assembly?
a. Torque shaft, torquemeter housing, and front coupling assembly b. Two concentric shafts, torquemeter housing, and torquemeter pickup c. Torquememter housing, bearing lock tube, and front coupling assembly d. Two outer shafts, torquemeter pickup assembly, and torquemeter backup assembly |
b. Two concentric shafts, torquemeter housing, and torquemeter pickup
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The amount of twisting deflection is determined by the
a. torque shaft b. reference shaft c. safety coupling d. pinion input gear |
b. reference shaft
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The torquemeter exciter wheels are IN PHASE when
a. the shaft power output is transmitted from the power unit b. negative or positive torque is transmitted to the torque indicator c. the rectangular teeth on the exciter wheels are aligned at zero torque d. there is a change in the torque transmitted to the torque shaft exciter wheel. |
c.the rectangular teeth on the exciter wheels are aligned at zero torque
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The purpose of the T56 safety coupling is to
a. prevent overspeed of the propeller b. increase propeller pitch as negative torque occurs c. maintain constant engine speed by decreasing propeller blade angle d. disconnect the power section from the RGB assembly |
d. disconnect the power section from the RGB assembly
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For the safety coupling to disconnect the power unit from the RGB, torque MUST reach between
a. 4,200 and 7,200 inch-pounds b. 1,200 and 4,200 inch-pounds c. -1,200 and -4,200 inch-pounds d. -4,200 and -7,200 inch-pounds |
d. -4,200 and -7,200 inch-pounds
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The stationary (stator) vane blades on the T56 compressor are used to
a. increase velocity b. increase pressure c. decrease pressure d. prolong compressor life |
b. increase pressure
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What type of bearings support the T56 compressor rotor at the front and rear?
a. Front, roller; rear, roller b. Front, roller; rear, ball c. Front, ball; rear, roller d. Front, ball; rear, ball |
b. Front, roller; rear, ball
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Which T56 compressor component supports the compressor rear bearing labyrinth seal?
a. Compressor rotor b. Air inlet housing c. Compressor diffuser d. First-stage compressor wheel hub |
c. Compressor diffuser
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In the T56 engine, turbine rotor torque is transferred to the compressor rotor by the
a. turbine coupling shaft b. torquemeter outer shaft c. compressor extention shaft d. turbine to compressor tie bolt |
a. turbine coupling shaft
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The purpose of the guide vane support is to direct airflow
a. out of the turbine section b. into the combustion section c. onto the turbine rotor blades d. toward the compressor stator blades |
c. onto the turbine rotor blades
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What are used to retain the turbine buckets in the first-stage wheel of the T56-A-15 engine?
a. Cotter pins b. Curvic splines c. Cover plate seals d. Anti-rotation pins |
c. Cover plate seals
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The AE2100D3 power plant major assemblies are the PGB, torquemeter assembly, power section, accessory drives, and the
a. nacelle structure b. hydraulic pump c. electrical generator d. tailpip assembly |
a. nacelle structure
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On the AE2100D3, the forward engine mounts are located on the
a. air inlet housing b. diffuser assembly c. sides of the PGB d. aft side of the PGB |
c. sides of the PGB
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What type of compressor rotor assembly is used on the AE2100D3 engine?
a. 14 stage axial-flow b. 14 stage centrifugal-flow c. 16 stage axial-flow d. 16 stage centrifugal-flow |
a. 14 stage axial-flow
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What AE2100D3 nacelle access door contains a fire access door?
a. Lower right turbine access door b. Lower left turbine access door c. Upper right turbine access door d. Upper left turbine access door |
a. Lower right turbine access door
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The AE2100D3 engine mount is divided into how many major structures?
a. Two b. Three c. Four d. Five |
a. Two
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The T700 engine consists of what four modules?
a. Combustion, compressor, hot, and accessory section b. Power turbine, accessory, compressor, and hot sections c. Compressor, combustion, cold, and power turbine section d. Accessory, compressor, combustion, and power turbine section |
b. Power turbine, accessory, compressor, and hot sections
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What routes oil and fuel through the T700 engine AGB?
a. Internal lines b. External lines c. Internal passages d. External passages |
c. Internal passages
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What components mount on the front face of the AGB on the T700 engine?
a. Alternator and oil cooler b. Scavenge pump and oil cooler c. Alternator and fuel boost pump d. Scavenge pump and fuel boost pump |
c. Alternator and fuel boost pump
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The T700 gas generator turbine rotor drives the
a. compressor and turbine stators b. compressor and AGB c. AGB and combustion d. AGB and turbine stators |
b. compressor and AGB
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The T700 power turbine drive shaft assembly is made up of what two components?
a. Overspeed and Np sensor b. Drive shaft and overspeed sensor c. Torque sensor tube and Np sensor d. Drive shaft and torque sensor tube |
d. Drive shaft and torque sensor tube
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Which F108 major engine module provides for mounting of the front of the engine to the airframe?
a. Fan major module b. Accessory major module c. Core engine major module d. LPT major module |
a. Fan major module
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Primary airflow in the F108 engine is through all of the following components EXCEPT the
a. booster b. core engine c. accessory gearbox d. low-pressure turbine |
c. accessory gearbox
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The F108 engine can be broken down into how many INDIVIDUAL modules?
a. 5 b. 7 c. 10 d. 17 |
d. 17
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What percentage of the total engine thrust does the secondary airflow on the F108 engine produce?
a. 20 b. 50 c. 80 d. 100 |
c. 80
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On the F108 engine, the purpose of the HPT nozzle assembly is to accelerate the energy from the combustion gases to drive the
a. HPT rotor b. LPT rotor c. booster rotor d. fan rotor |
a. HPT rotor
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On the F108 engine, the LPT shaft assembly connects the fan shaft with the
a. LPT rotor b. HPT rotor c. LPT stator d. HPT stator |
a. LPT rotor
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On the F108 engine, what connects the IGB to the TGB bevel gears?
a. Radial drive shaft b. Vertical drive shaft c. Horizontal drive shaft d. Power take-off drive shaft |
a. Radial drive shaft
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On which module of an F100-PW-220 engine is the stator generator mounted?
a. Core b. Inlet fan c. Gearbox d. Augmenter |
c. Gearbox
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External flanges on the F100 engine are referred to by
a. letter designations b. number designations c. directional references d. accessories references |
c. directional references
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On an F100-PW-220 engine, the No. 1 bearing assembly is located in the
a. diffuser case b. rear fan duct c. intermediate case d. front compressor stator inlet shroud. |
d. front compressor stator inlet shroud.
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When blending fourth stage compressor blades on an F100-PW-220 engine, a MAXIMUM of how many blends are allowed on any single edge?
a. Two b. Three c. Four d. None |
a. Two
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On an F100-PW-220 engine, the front compressor drive turbine shaft is connected to the front compressor rotor by
a. the compressor drive shaft coupling b. the turbine drive shaft coupling c. eight connecting tie-rod bolts d. six connecting tie-rod bolts |
b. the turbine drive shaft coupling
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Which bearing is located in the fan drive turbine module on an F100-PW-220 engine?
a. No. 1 b. No. 3 c. No. 4 d. No. 5 |
d. No. 5
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Major components of the F100-PW-220 engine augmentor duct and nozzle module are nozzle actuators, nozzle assembly, and
a. spray bars b. flameholder c. combustion chamber control d. combustion chamber liner and duct |
d. combustion chamber liner and duct
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On an F100-PW-220 engine, the gearbox module is driven by the rear compressor through
a. a transfer drive shaft b. a gearbox drive shaft c. a radial drive shaft d. an axial drive shaft |
b. a gearbox drive shaft
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How many stages are in the inlet fan module of the F119-PW-100 engine?
a. Two b. Three c. Four d. Five |
b. Three
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How many hollow struts/inlet guide vanes are contained in the inlet fan case of the F119 engine?
a. 15 b. 18 c. 21 d. 23 |
c. 21
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Where is the Tt2 located on a F119-PW-100 engine?
a. Inside the inlet nose cone at the 2:00 position b. In the fan inlet guide vane case at the 5:30 position c. In between the 1st and 2nd stages of the low pressure compressor at 6:00 d. In between the 2nd and 3rd stages of the low pressure compressor at 6:00 position |
b. In the fan inlet guide vane case at the 5:30 position
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Which is NOT a part of the core module of a F119-PW-100 engine?
a. Diffuser case b. Intermediate case c. Low pressure compressor d. High pressure compressor |
c. Low pressure compressor
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Which bearing compartment is contained in the intermediate case of the F119-PW-100 engine?
a. No. 1 and No. 2 bearing b. No. 2 and No. 3 bearing c. No. 3 and No. 4 bearing d. No. 4 and No. 5 bearing |
b. No. 2 and No. 3 bearing
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On an F119-PW-100 engine, what function does the diffuser case serve other than housing the combustor?
a. Increases the velocity of compressor discharge air b. Reduces the velocity of compressor discharge air c. Increases the velocity of turbine discharge air d. Reduces the velocity of turbine discharge air |
b. Reduces the velocity of compressor discharge air
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What drives the IFM in the F119-PW-100 engine?
a. Gearbox assembly b. HPT assembly c. LPT module d. Core engine module |
c. LPT module
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Which bearing is located in the LPT of the F119-PW-100 engine?
a. No. 2 bearing b. No. 3 bearing c. No. 4 bearing d. No. 5 bearing |
d. No. 5 bearing
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On the F119-PW-100 engine, which of the following is NOT attached to the gearbox assembly?
a. Actuator fuel pump b. Main fuel pump c. Augmentor fuel control d. Engine generator |
c. Augmentor fuel control
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What is the nozzle module mounted to on the F119-PW-100 engine?
a. Core module b. LPT module c. HPT module d. Augmentor assembly |
d. Augmentor assembly
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