WorksheetsGas Turbine Engine Quiz
Total questions: 144
Worksheet time: 1hrs 12mins
How is the Gas Turbine Engine developing their power?
By burning a compressed air
By burning combustible mixtures of fuel and air
By burning of fuel in the turbine area
Turbojet engine imparts a relatively :-
small acceleration to large mass of air
large acceleration to large mass of air
large acceleration to a smaller mass of air
In order the get the thrust the gas turbine engine imparts relatively large acceleration to:
smaller mass of air
large mass of air
heavy amount of air
The first device that hero invented which utilises the jet reaction is?
The aeolipile
The turbocharger
The lawn sprinkler
The Aeolipile is the first device which utilities the jet reaction. Who is invented the Aeolipile?
Hero, an Egyptian scientist
Giovanni Branca, an Italian engineer
Sir Isaac Newton, a British astronomer and physicist
What is the formula for Newton's Second law?
Force= mass x quantity of air
Force = velocity x quantity of air
Force = mass x acceleration
What is Newton's Third Law?
For every acting force there is equal and opposite directional force
For every acting force there is equal and opposite reacting force
For every acting thrust there is equal and balance reacting force
Newton's Third Law states;
a change in motion is proportional to the force applied
for every action force, there is an equal and opposite reaction force
a body at rest will remain at rest unless it is acted upon by external force
Which of the Newton's law that truly describe the jet propulsion theory?
1st Newton Law
2nd Newton Law
3rd Newton Law
What will happen if the gas or fluid flowing through a restricted area?
Velocity is increase, temperature and pressure will decrease.
Pressure is increase, velocity and temperature will decrease.
Temperature is increase, velocity and pressure will decrease.
Bernoulli's theorem states that when a gas or fluid is flowing through a restricted area, its:-
velocity decreases, temperature and pressure decrease
velocity increases, temperature and pressure decrease
velocity increases, temperature and pressure increase
Bernoulli's theorem states that when a gas or fluid is flowing through a larger area (divergent duct), its:-
Velocity increase, temperature and pressure decrease
Velocity decrease, temperature and pressure decrease
Velocity decrease, temperature and pressure increase
What is a Ram engine?
It a slow engine and no moving part
is a simple engine and has no moving part
a engine that provide with shutter
A ram-jet ;
needs assistance for take off
has high propulsive efficiency
has a set of turbine and compressor
The set of shutters in the pulse jet engine is spring-loaded to remain in:-
closed position
open position
intermediate position
What cause the shutter of pulse jet engine to open?
jet air pressure
ram air pressure
ram spring
What is the other name for rocket engine?
Rocket pop
Rocket burner
Rocket motor
Poor air pressure and velocity distribution at the front of the compressor may cause?
Compressor stall
Thrust losses
Decrease jet velocity
Engine manufacturers normally rate their engines using?
Bellmouth Inlet Duct
Single Inlet Duct
Divided Inlet Duct
The purpose of compressor in a gas turbine engine is to:-
provide high pressure air
provide low pressure air
provide low pressure fuel
One of the disadvantages of the centrifugal flow compressor over the axial flow compressor is?
low starting power
ruggedness and therefore resistance to foreign object damage
large frontal area for a given airflow
The function of Diffuser in centrifugal - flow compressor is to convert:-
kinetic energy into static pressure
static pressure into dynamic pressure
pressure energy into kinetic energy
The rotating part in a centrifugal flow compressor is :-
Diffuser
Impeller
Manifold
An advantage of the centrifugal flow compressor is its:-
Small frontal area
High ram efficiency
High pressure rise per stage
A stage of an axial flow compressor consists of :-
A row of stator vanes and a row of rotor blades
A row of rotor blades and a row of stator vanes
A rotor and diffuser
The main advantage of the axial flow compressor is :-
frontal area
high pressure rise per stage
high ram efficiency
In a axial flow compressor, throughout the compression stage the absolute velocity of the air?
Increases
Decreases
Remain constant
Where is the attachment place for combustion section in the single spool engine?
compressor inlet casing
compressor outlet casing
intake of compressor
What is the function of combustion section?
to provide place for air to pressurize
to provide place for fuel to heat up
to provide consistent heating of airflow delivery by compressor.
What is the temperature of combustion inside the combustor with air fuel ratio 15:1?
2200 deg. c
2100 deg. c
2000 deg. c
The total volume of air entering the combustion chamber is divided into:-
75% for burning and 25% for cooling
25% for burning and 75% for cooling
50% for burning and 50% for cooling
How many % of air is used for burning process?
75%
35%
25%
What is the function of remaining 75% of air which enter the combustion chamber?
To complete the combustion
to absorb the heat of combustion
to increase the gas temperature
How many % of energy is absorbed by turbine wheel of turbojet engine?
60%-80%
90%
55%-85%
How many % of air as primary air?
20%
25%
30%
The type of air in the combustion chamber that is used for complete combustion and to shape the flame is?
Primary Air
Secondary Air
Tertiary Air
What is the function of secondary air?
for initial combustion and shape the flame
to complete the combustion and cool the ignite plug
to complete the combustion and shape the flame
The type of air in the combustion chamber that the flame heats up all three streams of air causing it to expand greatly is?
Primary Air
Secondary Air
Tertiary Air
What is the function of tertiary air?
for cooling
to help the combustion
to cool the fuel injection system
Which of the following types of combustion chamber are used in the gas turbine engine?
Can-annular, Can and Cascade Vanes
Annular, Variable and Reverse flow Annular
Can-annular, Multiple Can, Annular Reverse Flow annular
The most common type of combustion chamber used today for small and large aircraft is?
Annular
Multiple can
Can-annular
The more common type of combustion chamber used on commercial aircraft powered by Pratt and Whitney;
Annular
Multiple-can
Can-annular
How many outer cases for the can-annular combustor?
One
Two
Three
How the can-annular combustion chambers are interconnected to each other?
by external tube
by internal tube
by flame propagation tube.
Where is the location of ignite plug for the annular type of combustion chamber?
at the middle
in the lower can
in the upper can
What is an advantage of the can-annular combustor?
a. Easy on overhaul
b. easy removal and installation
c. easy of on-wing- maintenance
What is the difference of reverse flow annular if compared to other types of combustors?
air flowing around the chamber is entering from rear
air flowing around the chamber is entering from front
air flowing direct into chamber
The advantage of having a Reverse Flow Annular Combustor is?
it improves engine fuel consumption
it allows a reduced efficient combustion
it allows for a shorter and lighter engine
What is the function of nozzle guide vane?
convert part of gas heat and pressure energy into potential energy.
convert hot gases into potential energy.
convert part of gas heat and pressure energy into kinetic energy
Increasing the nozzles diaphragm area, it will cause;
slower engine acceleration
increase compressor stall
faster engine acceleration
Some nozzle guide vanes are made hollow to allow for?
cooling
weight reduction
higher dynamic pressure
Turbine Nozzle Vanes are normally cooled by?
Fan discharge air
Atmospheric air
Compressor bleed air
How the reaction turbine's blades produce their turning force?
a by aerodynamic action
b. by direct strike
c. by high velocity action
The type of turbine blade that distributes the power load evenly from blade base to blade tip is?
Impulse Blade
Reaction Blade
Reaction Impulse Blade
The most highly stressed part in the engine due to high temperature and high rotational speed;
Compressor
Turbine Wheel
Combustion Chamber
Why some turbine blades are shroud at the outer perimeter?
Prevent blade distortion
Prevent blade from growing in length
Prevent blade-tip losses and excessive vibration
What is the meant by turbine blade CREEP?
growing in length
shorten in length
scratching the casing
The method of attaching the blades to turbine disc used in most of gas turbine engine is?
Fir-tree root
De-laval bulb root
B.M.W hollow root
Thrust Reversers are used by high performance jet engine after landing for?
Increase the speed of the aircraft
Quickly slowing down the aircraft on landing
Quickly reduce the speed of the aircraft by reduce angle of attack
On a front fan engine, reverse thrust is obtained by reversing the direction of?
Fan Blade Pitch
Exhaust Gas Stream (Hot Stream)
Fan Discharge Air (Cold Stream)
On propeller-powered aircraft, reverse thrust is obtained by changing?
The propeller blades pitch
The exhaust gas stream (hot stream)
The fan discharge air (cold stream)
Mechanical blockage reverser is:-
A pre-exit type
A post exit type
An intermediate exit type
Aerodynamic blockage reverser is:-
A pre-exit type
A post exit type
An intermediate exit type
What types of ignition used on modern gas turbine engine?
high intensity, direct duty, capacitor discharge type
high intensity, intermittent duty, capacitor discharge type
Low intensity, direct duty capacitor discharge type
What is the two common classification of capacitor ignition system?
Low voltage and intermediate voltage
low voltage and high voltage
Intermediate voltage and high voltage
Igniters plugs are usually incorporated in the engine combustor at?
4 and 8 o'clock position
6 and 12 o'clock position
11 and 1 o'clock position
What the PRIMARY used of electrical ignition system?
Provide Engine ground starting
Prevent ice forming during ground starting
Provide relight capability if flameout during take-off
What the SECONDARY function of electrical ignition system?
Provide Engine ground starting
Prevent ice forming during ground starting
Provide relight capability if flameout during occurs
What is the different of ignite plug to the spark plug?
The gap of ignition tip is much smaller
The ignition tip is much longer
The gap of ignition tip is much wider
What is the material of ignite plug?
nickle chromium alloy
nickle steel alloy
nickle chromium steel
How much power is required for relight stand by in order longer life of ignite plug?
2-5 joule
3-6 joule
4-8 joule
The high voltage igniter plug able to change to………………
low voltage igniter
medium voltage igniter
high voltage igniter
During removal of igniter plug, after disconnecting transformer input lead the recommended waiting time prior to disconnecting igniter lead is?
1 minute
1 to 5 minutes
10 to 30 minutes
In order to remove the ignite plug, how long to wait before disconnect the ignite lead?
1-5 seconds
2-5 minutes
1-5 minutes
What is the radioactive material in the ignite plug?
casium - barium 137
metallic sodium
culsium 107
How to dispose the unserviceable igniter plug?
Return to store
place in the container and bury.
place in the plastic bag
What properties of aviation gasoline that extensive use of gasoline in turbine will result in poor performance?
High corrosion and weight
Viscosity and low volatility
Physical and thermal properties
The gasoline fuel can be used on gas turbine engine only for
starting
as emergency fuel
back up fuel.
What type of fuel used on the gas turbine engine?
kerosene type
avgas
petrol
The fuel commonly used on gas turbine engine is?
Jet A-1
Aero 500
Aviation gasoline
What is one of new problem of the wide used of jet fuel?
problem to start
no fuel supply
contamination of water and microbiological
What are the factors required for satisfactory ignition of fuel?
volatility and viscosity
volatility and degree of atomization
viscosity and degree of atomization
What is the fuel volatility?
the ability of liquid to change to gases state easily
the ability of gas to change to liquid state easily
the ability of liquid to change to viscosity state easily
What will happen to fuel in the tank or pipelines if the fuel is so volatile?
fuel will leaks
fuel will be change to liquid
which cause vapour lock.
What type of additive is used to protect ferrous metal in the fuel system from corrosion?
static dissipate additive
biocide additive
corrosion inhibitors
The type of fuel additives that is used to combat microbiological growths in jet fuel is?
Biocide Additives
Static Dissipate Additives
Corrosion Inhibitor
What is the complete engine fuel system?
Low pressure fuel system and intermediate pressure fuel system
Low pressure fuel system and high pressure fuel system
high pressure fuel system and intermediate pressure fuel system
What system supply fuel at low pressure to the engine?
aircraft fuel system
intermediate fuel system
engine fuel system
When the filter becomes clogged with ice crystals, what type of switch turn on the icing light?
the differential pressure Switch
the by-pass switch
the relief valve switch
Which sub-system of engine fuel system that convert the fuel from a liquid state into an atomized state suitable for burning?
A low pressure fuel system (LP)
A medium pressure fuel system (MP)
A high pressure fuel system (HP)
The Fuel Heater can be heated by?
Hot bleed air
Electrical mate heater
Engine heat exchanger
The fuel which pass through the heater can be heat up by:
on the heater system
allowing hot oil go to fuel heater
allowing hot bleed air from the compressor to pass through the fuel heater.
What is the function of tank booster pump?
to pressurize the fuel
to formulate the fuel
to precaution the fuel
After fuel passing through the fuel heater, fuel is flows into the filter for what purpose?
to filter impurities and ice crystals
to filter the magnetic chip
to filter dirty water
How does ice crystal can form in the fuel?
caused by fuel condensations
caused by water waste system leaking
caused by freezing water droplets in the fuel tank
The engine oil cooler uses the fuel entering the engine to cool the oil and also?
war the air
warm the oil
warm the fuel
Why turboprop engine required slightly higher viscosity oil compare to gas turbine engine?
due to free turbine engine
due to absent of reciprocating parts
due to reduction gear and propeller pitch change mechanism
What type of oil system use on gas turbine engine?
total loss system
expendable system
re-circulary oil system
The type of lubricating system where oil is distributed and returned to the oil tank by pumps is?
Expandable Self-delivery System
Self-contained Re-circulatory System
Self-delivery Wet Sump-contained System
What type of oil system, where the oil is spilled overboard after the engine has been lubricate?
self - contain oil system
expendable system
re-circulary oil system
There are two type of re-circulatory oil system:
pressure relief valve and total loss system
full flow system and expendable
full flow system and pressure relief valve system.
In the pressure relief valve system, how the oil flow is control to the bearing?
by limiting the maximum pressure in the feed line.
by limiting the maximum pressure in the return line
by automatically adjusting pressure
The full flow system normally use on what type of engine?
gas turbine engine
turbo prop engine
vertical lift booster engine
The system is simple and low weight, required no oil cooler and scavenge pump. This statement refers to what type of oil system?
Full flow system
Total loss system
self- contain re-circulatory oil system
In the hot oil tank system, the oil cooler is normally located in?
Vent Subsystem
Scavenge Subsystem
Pressure Subsystem
In the Cold Oil Tank System, the oil cooler is normally located in?
Vent subsystem
Scavenge subsystem
Pressure subsystem
In the cold tank system where is the location of oil cooler?
In the scavenge subsystem
in the pressure subsystem
in the between pressure and scavenge system
Which air system those the airflows which DO NOT directly contribute the engine thrust?
Engine internal air system
Engine external air system
Engine supplementary air system
What is the definition of internal air system?
air use for cooling
the air do not directly contribute to engine thrust
air mainly for internal combustion.
Up to how many % of internal air is use as internal air system?
25%
35%
20%
The air for internal air system is taken from?
combustion section
intake section
compressor section
Bearing housing sealing is done by?
Bearing internal circlips
Engine internal air system
Engine external air system
In air cooling and sealing system, the air is taken from?
Compressor Section
Air Intake Section
Turbine Section
How are these components, turbine blade, turbine disc, the bearing and the engine main casing are cool?
by directing a flow of cool air over this components
by directing a flow of hot air over this components
by pressurize air over this components
The purpose of bearing housing sealing is?
prevent air leakage into bearing housing
prevent inward flow of exhaust gas
prevent oil leakage into engine main casing
How to seal the bearing housing and prevent the leakage of oil into the main casing?
by directing the air across the bearing sump.
by directing the air across the bearing oil seal
by installing the air seal
How the air is separated from the oil?
by centrifugal force
by venting system
by de-aerator system
How to maintain the pressure difference between two internal engine sections?
multi-groove air seal is used
circular seal is used
bulkhead seal is used
The engine bay or pod is usually cooled by?
Internal cooling air flow
Directing some compressor discharge air into bay
Atmospheric air being passed around the engine
What is the function of fireproof bulkhead?
to tie up the cool zone and hot zone
to separate hot zone and cool zone
to pressurize the hot area and cool area
To ensure the gas turbine engine will start satisfactory, two separates system are required
a system must rotate the compressor and a system to read the indicator
a system must rotate the compressor and a system to ignite the fuel air mixture
a system must read the indicator and a system to ignite the fuel
What is the purpose of starter?
to rotate the compressor up to required self-sustaining speed
to ignite the fuel air mixture
to pump fuel for combustion
What type of device used for Engine Electric Starter?
DC Electric motor
AC Electric motor
Electro pneumatic motor
At what % engine rpm, the engine starts to light up?
above 20%
10%
slightly below 20%
After how long the engine able to reaches self- sustaining speed?
between 10 to 15 seconds
between 15 to 20 seconds
between 20 to 25 seconds
When the time is the starter circuit is cancelled?
before and close to 20 seconds
after 20 seconds
at 30 seconds
After how long of engine starting the engine reach to the idle rpm?
1 minutes
25 seconds
30 seconds
The type of starter used on most modern commercial jet engines;
Air Starter
Electric Starter
Gas Turbine Starter
Type of starter provides a high power output?
Cartridge starter
Hydraulic Pressure starter
Iso-Propyl-Nitrate (AVFIN)
What type of starter used to start some small jet engine?
air starter
gas turbine engine starter
hydraulic starter
What is the gas turbine engine starter that is self-contain?
air starter
gas turbine engine starter
avpin starter
Which type of starter is used for some jet engine and is completely self-contained?
Air Starter
Electric Starter
Gas Turbine Starter
Where are the areas of engine required protection against ice?
air intake and compressor section
front of engine and the leading edge of the air intake duct
air intake duct and accessories
What will happen if the ice restricts the air flow to the engine?
causing loss of engine performance and high engine temperature
the engine will run in rich mixture
causing loss of engine performance and possible engine malfunction
The ice protection systems of turbo-jet engines generally use?
Hot Air
Hot Oil
Electric Heaters
Aircraft turbojet engine used what type of ice protection to protect from ice formation?
hot air supply system
electrical power system
hot oil system
The electrical power system is used to break the ice is known as?
anti- icing system
de- icing system
the ice protection system
The ice protection systems of turbo propeller engines generally use?
Hot Oil
Hot Air
Electrical power
What are two basic systems of ice protection?
Hot air & electrical power
Hot water repellent & Hot air unit
Electrical power & Hot water repellent
The hot air system is generally used to prevent the formation of ice and is known as?
A de-icing system
A anti-icing system
A discharged system
The electrical power system is used to break up ice that has formed on the surfaces is known as?
A de-icing system
A anti-icing system
A preventing system
Hot air for anti-icing system is usually taken from?
compressor first stages
compressor last stages
turbine low pressure stages
In the ice protection system, the hot air is taken from?
First stage of the turbine section
First stage of the compressor section
Last stage of the compressor section
The protection system used to break up the ice that has formed on propeller blade surfaces;
Hot air System
Electrical Power System
De-Misting System
