Turbine Engine Basics
47 Questions
| Attempts: 262
A turbine engine, perhaps more commonly referred to as a gas turbine, is a type of internal combustion engine, with an upstream rotating compressor coupled to a downstream turbine. What do you know about them yourself? Let’s find out.
Questions and Answers
- 1.
___ _____ Section - The portion of the aircraft ahead of the engine compressor that takes the air into the aircraft and directs it into the engine at the correct speed and directions
Correct Answer
air inlet - 2.
The __________ section of the Gas Turbine Engine is the section whose components increase the pressure of the air flowing through it
Correct Answer
compressor - 3.
A ________ duct installed in the compressor outlet in a turbine engine reduces the velocity of the air leaving the compressor and increases its pressure.
Correct Answer
diffuser - 4.
The 1st section of a gas turbine engine is the ___ ______ ____ section
Correct Answer
air inlet duct
air duct inlet - 5.
The 3rd section of a gas turbine engine is the __________ section
Correct Answer
combustion - 6.
The 2nd section of a gas turbine engine is the __________ section
Correct Answer
compressor - 7.
The 6th section of a gas turbine engine is the _________ section
Correct Answer
accessory - 8.
What section comes after the 6th section of gas turbine engine?
Correct Answer
starting
lubrication
Fuel supply
anti-ice
pressurization
cooling
auxillary systems
auxillary - 9.
The 4th section in a gas turbine engine is the _______ section
Correct Answer
turbine - 10.
The 5th Section in a gas turbine engine is the _______ section
Correct Answer
exhaust - 11.
Ultra-High bypass ratios are:
- A.
4:1
- B.
1:1.25
- C.
Greater than 10:1
- D.
Greater than 16:1
Correct Answer
D. Greater than 16:1 -
- 12.
Fan diameter determines a fan's ______ ratio and _____ ratio. Check the two that apply.
- A.
Duct
- B.
Bypass
- C.
Combustion
- D.
E.P.R
- E.
Thrust
Correct Answer(s)
B. Bypass
E. Thrust -
- 13.
The ______ ____ is the fixed conical fairing centered in the exhaust stream immediately aft of the last-stage turbine wheel. It prevents turbulence and prevents hot gases from circulating over the rear face of the turbine wheel.
Correct Answer(s)
exhaust cone - 14.
The ___________ is a device in the exhaust system of a turbojet or turbofan engine, used to increase the thrust for takeoff and for special flight conditions.
- A.
Tangential strut
- B.
Afterburner
- C.
Nozzle guide vein
- D.
Thrust reverser
- E.
Exhaust tailpipe
Correct Answer
B. Afterburner -
- 15.
A convergent duct, is such that its cross-sectional area increases in the direction of fluid flow.
- A.
True
- B.
False
Correct Answer
B. False -
- 16.
A _____ ___ valve, located in the compressor case of an axial-flow gas turbine engine, allows some of the air to escape to help prevent compressor stall or surge, and to improve the airflow.
Correct Answer
bleed air - 17.
With regards to turbine engines, the term"bulb root" refers to a turbine blade attachment method wheras:
- A.
The root is shaped like a fir tree (christmas tree)
- B.
The root is rounded in the middle and mates to a similar rounded hole in the periphery having an "interference" fit
- C.
The root is shaped like the roots of an onion bulb
- D.
The root is has rounded ends and loosely mates with a similar rounded hole in the periphery of the turbine wheel.
Correct Answer
D. The root is has rounded ends and loosely mates with a similar rounded hole in the periphery of the turbine wheel. -
- 18.
The ___ ____ root is a method of attaching turbine blades into the turbine wheel in which the root is shaped like a notched-edge resembling a Christmas tree. The blade root fits loosely into similarly shaped slots in the periphery of the turbine wheel. Check all that apply!
- A.
Fir tree
- B.
Notched bulb
- C.
Dove tail
- D.
Flat profile
Correct Answer
A. Fir tree -
- 19.
How many varieties of gas turbine engines are there?
- A.
7
- B.
5
- C.
3
- D.
None - all turbines are the same!
Correct Answer
B. 5 -
- 20.
Name another variety of turbine engines other than turbojet.
Correct Answer
unducted fan
turbofan
turboshaft
turboprop
turbojets
turbofans
turboshafts
turboprops
unducted fansExplanation
There are five varieties: turbojets, turboprops, turbofans, turboshafts, and unducted fanRate this question:
- 21.
E.P.R. for a turbine engine represents all of the following except: (Check all that could apply)
- A.
Exhaust Power Return ratio
- B.
Ration of station: Pt7/Pt2
- C.
Engine Pressure Ratio
- D.
Ratio of station: Pt5/Pt2
- E.
Engine Pressure Relief
- F.
Ratio of Turbine Discharge Pressure : Compressor Inlet Pressure
Correct Answer(s)
A. Exhaust Power Return ratio
E. Engine Pressure Relief -
- 22.
Regarding thrust developed in a turbine engine, the term C.I.P. stands for?
Correct Answer(s)
Compressor Inlet Pressure - 23.
Regarding thrust developed in a turbine engine, the term T.D.P. stands for?
Correct Answer(s)
Turbine Discharge Pressure - 24.
The first flight by a jet propelled aircraft took place in August 27th of ____ (what year).
Correct Answer(s)
1939 - 25.
Jet propulsion is a practical application of which of the following of Newton's laws of motion:
- A.
First
- B.
Second
- C.
Third
- D.
Fourth
Correct Answer
C. Third -
- 26.
What is Newton's third law of motion?
- A.
For every action there is an equal and opposite reaction
- B.
A body at rest tends to stay at rest, a body in motion stays in motion unless acted upon by an outside force
- C.
Energy is neither created nor destroyed, but changes form
Correct Answer
A. For every action there is an equal and opposite reaction -
- 27.
The classification that applies to torque producing turbine engines refers to: (Check all that apply)
- A.
Turbojets
- B.
Turboprops
- C.
Turbofans
- D.
Unducted Fans
- E.
Turboshafts
Correct Answer(s)
B. Turboprops
E. Turboshafts -
- 28.
A turbofan is considered a torque producing engine (T/F)
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Turboshafts and Turboprops are torque producing turbine enginesRate this question:
-
- 29.
One of three other types of "propulsive" engines other than turbojets would be _____________.
Correct Answer
pulsejet
rocket
ramjet - 30.
Both turboprop and turboshaft engines must use a __________ ____ between the engine and the prop/rotors
Correct Answer
reduction gear
reduction gearbox - 31.
A gas turbine engine that delivers power through a shaft to operate something other than a propeller is referred to as a ___________ engine.
Correct Answer
turboshaft - 32.
A High bypass ratio turbofan engine has a bypass ratio of ____ to 1 or greater.
Correct Answer
4 - 33.
Engines that use a separate turbine that is not mechanically connected to a compressor to drive a propeller are called ____ turbine engines.
Correct Answer
free - 34.
The inlet duct of a turbine engine is normally considered to be a part of the airframe. (T/F)
- A.
True
- B.
False
Correct Answer
A. True -
- 35.
When subsonic air passes through a section of a duct that has a divergent shape, its velocity will increase. (T/F)
- A.
True
- B.
False
Correct Answer
B. False -
- 36.
The two basic types of compressors used on turbine engines are ___________ and axial.
Correct Answer
centrifugal - 37.
The three main components of a centrifugal compressor are: Impeller, diffuser, and ___________.
Correct Answer
manifold - 38.
More than __ (what number) stages of compression is not practical using a centrifugal compressor.
- A.
3
- B.
2
- C.
5
- D.
1
- E.
12
Correct Answer
B. 2 -
- 39.
Modern centrifugal compressors can obtain a compression ratio as high as ___ to 1.
Correct Answer
15 - 40.
The two main elements of an axial flow compressor are: rotors and ______.
Correct Answer
stators
stator - 41.
Axial flow compressors have a pressure rise per stage of approximately ______ to 1.
- A.
2
- B.
1.25
- C.
8
- D.
16
Correct Answer
B. 1.25 -
- 42.
The rotating elements of an axial flow compressor that make up the rotors are called ______.
Correct Answer
blades
blade - 43.
The fixed elements of an axial flow compressor that make up the stators are called _______.
Correct Answer
vanes
vane - 44.
Compressor blades which have a reduced thickness at the tips are called _______ tips.
Correct Answer
profile - 45.
_________ vane segments may be used to minimize vibration.
Correct Answer
shrouded - 46.
On a multi-spool engine, the low-pressure compressor (N1) will speed up with an increase in altitude.
- A.
True
- B.
False
Correct Answer
A. True -
- 47.
What two factors determine the angle of attack of a compressor blade?
- A.
Relative airstream, vane pitch
- B.
No. of stage compressor, No of compressor spools
- C.
Exhaust pressure ratio, bypass ratio
- D.
Inlet air velocity, compressor rpm
Correct Answer
D. Inlet air velocity, compressor rpm -
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Mar 20, 2022Quiz Edited by
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Nov 09, 2011Quiz Created by
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