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WorksheetsReviewer
Total questions: 70
Worksheet time: 35mins
Name
Class
Date
1.
The JT8D engine is classified as a:
a)
a) Centrifugal-flow turbojet
b)
b) Axial-flow, dual-spool turbofan
c)
c) Radial piston engine
d)
d) Free-turbine turboprop
2.
In what year was the JT8D-1 first certified?
a)
a) 1960
b)
b) 1963
c)
c) 1964
d)
d) 1966
3.
The JT8D-17R engine has a thrust rating of:
a)
a) 14,000 lb
b)
b) 15,500 lb
c)
c) 16,000/17,400 lb
d)
d) 18,000 lb
4.
By 1989, approximately how many JT8D engines had been produced?
a)
a) 5,000
b)
b) 8,000
c)
c) 11,882
d)
d) 15,000
5.
The function of secondary (bypass) air in a turbofan is to:
a)
a) Burn with fuel in the core
b)
b) Flow around the core and add thrust
c)
c) Only cool turbine blades
d)
d) Reduce exhaust gas pressure
6.
Engine flanges are labeled alphabetically starting from:
a)
a) The front of the engine
b)
b) The rear of the engine
c)
c) The middle of the compressor
d)
d) The accessory gearbox
7.
Which QEC component helps slow down the aircraft after landing?
a)
a) Exhaust nozzle
b)
b) Inlet cowl
c)
c) Thrust reverser
d)
d) Hydraulic pump
8.
Which aircraft was originally powered by the JT8D?
a)
a) Airbus A320
b)
b) Boeing 727
c)
c) Fokker 100
d)
d) Embraer 190
9.
A build group is also called a:
a)
a) Spool
b)
b) Module
c)
c) Case
d)
d) Rotor
10.
The fan inlet group (72-23-00) contains how many inlet guide vanes?
a)
a) 12
b)
b) 16
c)
c) 19
d)
d) 20
11.
The front compressor group consists of:
a)
a) 3 stages
b)
b) 6 stages (2-stage fan + 4-stage LPC)
c)
c) 7 stages
d)
d) 8 stages
12.
The rear compressor group performs the final ______ stages of compression.
a)
a) 3
b)
b) 5
c)
c) 7
d)
d) 9
13.
The turbine nozzle guide vanes primarily:
a)
a) Mix primary and secondary air
b)
b) Slow down airflow before combustion
c)
c) Direct gas flow to turbine blades at correct angle
d)
d) Increase thrust directly
14.
Which turbine group powers the N2 (high-pressure) compressor?
a)
a) Front compressor drive turbine
b)
b) Rear compressor drive turbine
c)
c) Exhaust case group
d)
d) Diffuser group
15.
Which component transmits power from the N2 rotor to engine accessories?
a)
a) Diffuser duct
b)
b) Accessory gearbox
c)
c) Exhaust case
d)
d) Fan discharge section
16.
The N1 spool connects which engine sections?
a)
a) HPC and HPT
b)
b) LPC and LPT
c)
c) Diffuser and combustor
d)
d) Exhaust case and mixer
17.
JT8D main bearings are typically:
a)
a) Sleeve bearings
b)
b) Anti-friction ball or roller bearings
c)
c) Magnetic bearings
d)
d) Hydrostatic bearings
18.
The main function of roller bearings is to:
a)
a) Provide only axial support
b)
b) Provide radial support and allow axial movement
c)
c) Prevent oil leakage
d)
d) Dampen vibration directly
19.
Which type of seal uses interlocking grooves and knife edges?
a)
a) Carbon seal
b)
b) Labyrinth seal
c)
c) Combination seal
d)
d) Magnetic seal
20.
A face-type carbon seal is used in front of the JT8D bearing (later models)?
a)
a) No. 3
b)
b) No. 4
c)
c) No. 5
d)
d) No. 6
21.
The main purpose of a borescope is to:
a)
a) Lubricate inaccessible engine parts
b)
b) Visually inspect internal parts without disassembly
c)
c) Measure fuel flow
d)
d) Detect oil leaks
22.
Which type of borescope is flexible and can bend around corners?
a)
a) Laser probe
b)
b) Flexible borescope
c)
c) Rigid borescope
d)
d) Magnetic probe
23.
Which components can be seen through borescope igniter ports?
a)
a) Combustion chambers and turbine blades
b)
b) Only nacelle parts
c)
c) Exhaust cone
d)
d) Fuel tanks
24.
Station 3 borescope ports allow inspection of:
a)
a) 1st stage turbine blades
b)
b) 6th and 7th stage compressor blades
c)
c) Exhaust mixer
d)
d) Accessory gearbox
25.
A jet engine produces thrust by:
a)
a) Burning all intake air completely
b)
b) Increasing the momentum of air backward
c)
c) Compressing oil in the gearbox
d)
d) Cooling the turbine
26.
At takeoff, the JT8D engine moves about how much air per second?
a)
a) 200 lb/sec
b)
b) 320 lb/sec
c)
c) 500 lb/sec
d)
d) 700 lb/sec
27.
The JT8D has an overall compressor pressure ratio of about:
a)
a) 10:1
b)
b) 12:1
c)
c) 17:1
d)
d) 20:1
28.
Flat rating maintains consistent thrust by:
a)
a) Regulating maximum EGT
b)
b) Lowering bypass ratio
c)
c) Increasing fuel flow
d)
d) Adjusting nozzle diameter
29.
During rapid acceleration, the operating line shifts:
a)
a) Toward the surge line
b)
b) Away from the surge line
c)
c) Toward flat rating
d)
d) Toward idle
30.
Which component supplies fuel during ground operation and engine start?
a)
a) Jet pump
b)
b) Crossfeed line
c)
c) Electric pump
d)
d) Relief valve
31.
What is the purpose of crossfeed lines in the fuel system?
a)
a) Balance fuel between engines
b)
b) Cool the tanks
c)
c) Vent excess fuel
d)
d) Act as drains
32.
Which feature prevents sloshing inside fuel tanks?
a)
a) Vent system
b)
b) Baffles
c)
c) Relief valve
d)
d) Drain ports
33.
Which component indicates real-time engine fuel consumption?
a)
a) Fuel pressure gauge
b)
b) Fuel flow meter
c)
c) Fuel temperature probe
d)
d) Low fuel light
34.
The ignition system sends sparks to combustion chambers:
a)
a) #2 and #5
b)
b) #3 and #6
c)
c) #4 and #7
d)
d) #1 and #8
35.
The exciter’s role in the ignition system is to:
a)
a) Vaporize fuel
b)
b) Convert aircraft power into high voltage
c)
c) Provide cooling air
d)
d) Monitor vibration
36.
The standard 20-4 Joule exciter system is powered by:
a)
a) 115 VAC only
b)
b) 28 VDC only
c)
c) 115 VAC + 28 VDC
d)
d) 400 Hz AC
37.
Which exciter system is rated for continuous use?
a)
a) Standard 20-4 Joule
b)
b) Dual 20 Joule
c)
c) Hybrid pack
d)
d) Emergency spark unit
38.
The first small spark in the ignition process is called:
a)
a) Trigger spark
b)
b) Ion spark
c)
c) Pre-fire spark
d)
d) Pilot spark
39.
The component that carries high-voltage energy from exciter to igniter plug is:
a)
a) Tachometer lead
b)
b) High-tension lead
c)
c) Fuel line
d)
d) Cooling duct
40.
In continuous ignition mode, which igniter plug fires?
a)
a) #4 only
b)
b) #7 only
c)
c) Both simultaneously
d)
d) None
41.
The nacelle component that funnels air into the engine.
(a)
42.
The major JT8D build group that supports the No. 5 bearing and burner cans.
(a)
43.
The type of bearing that provides both axial and radial support.
(a)
44.
A monitoring device that detects abnormal engine vibration.
(a)
45.
The compressor section was inspected through Station 3 borescope ports.
(a)
46.
The physical principle behind jet engine thrust.
(a)
47.
The safety device preventing tank collapse or over-expansion.
(a)
48.
The pump that ensures fuel flow during engine start.
(a)
49.
The cockpit panel where fuel system indicators and switches are found.
(a)
50.
The device that stores energy and produces a spark for ignition.
(a)
51.
The plugs located in combustion chambers #4 and #7.
(a)
52.
The JT8D group that houses temperature and pressure probes in the exhaust area.
(a)
53.
Raised rims on engine parts used for connection and mounting.
(a)
54.
The main JT8D build group containing the 6th and 8th stage bleed ports.
(a)
55.
The specific carbon seal type behind the No. 4½ bearing.
(a)
56.
A probe used to sense inlet pressure in the anti-surge system.
(a)
57.
The component that closes the 13th stage bleed valve before idle.
(a)
58.
The hot air source used by the anti-icing system.
(a)
59.
The panel indicator showing if an anti-ice valve has failed to open (DC-9).
(a)
60.
The exciter system consisting of a twin pack rated for continuous use.
(a)
61.
The JT8D is an axial-flow, fully ducted turbofan engine.
a)
True
b)
False
62.
Primary air bypasses the core and contributes to thrust directly.
a)
True
b)
False
63.
The diffuser slows down compressor air and increases its pressure.
a)
True
b)
False
64.
Bearings should not be handled with bare hands to prevent corrosion.
a)
True
b)
False
65.
A labyrinth seal maintains physical contact with the rotating seat.
a)
True
b)
False
66.
Borescoping requires complete engine disassembly.
a)
True
b)
False
67.
Flat rating ensures consistent thrust despite ambient temperature changes.
a)
True
b)
False
68.
Fuel baffles are used to prevent sloshing inside the tanks.
a)
True
b)
False
69.
Ignition systems are always rated for continuous operation.
a)
True
b)
False
70.
The dual 20 Joule exciter can operate either individually or simultaneously.
a)
True
b)
False
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