GTE random question and answer

c

As the aircraft produces thrust it begins to move forward, this is an example of:
a. Law of Conservation of Energy
b. Law of Equivalent Exchange
c. Newton’s Second Law of Motion
d. Newton's First Law of Motion

d

Acceleration of an object will increase as the net force increases depending on its..
a. Shape
b. Volume
c. Density
d. Mass

a

An object in motion stays in motion in a straight line, unless acted upon by an outside force. An object at rest will stay at rest until acted upon by an outside force.
a. Newton’s First Law of Motion
b. Newton’s Second Law of Motion
c. Newton’s Third Law of Motion
d. Newton’s Fourth Law of Motion

b

How does thrust vary with increasing altitude
a. Increase
b. Decrease
c. Decrease and then Increase at a certain point
d. Increase and then decreases at a certain point

d

A non-air breathing jet engine which produces tremendous thrust
a. Ramjet
b. Scramjet
c. GTE
d. rocket

c and d

How does thrust vary with temperature?
a. Increases as temperature increases
b. Decreases as Temperature Decreases
c. Decreases as temperatures Increases
d. Increases as temperature Decreases

d

What is the formula used for Newton’s Second Law of Motion?
a. V= at
b. V= d.t
c. M x V
d. F= ma

d

The type of jet engine cannot develop static thrust
a. Rocket
b. Turbofan
c. Turboprop
d. Ramjet

c

What causes Ram effect to happen?
a. Air slows down at the inlet of the engine, making the air expand, decreasing the velocity of the air
b. Air slows down at the inlet of the engine, making the air cool, decreasing the velocity of the air
c. Air slows down at the inlet of the engine, compressing the air, decreasing the velocity of the air.

c and d

How does thrust vary with altitude
a. Increases as Altitude Increases
b. Decreases as Altitude Decreases
c. Decreases as altitude Increases
d. Increases a Altitude Decreases

b

This type of jet can be made with few moving parts, and is capable of running statically, in which combustion occurs in pulses
a. Ramjet
b. Pulsejet
c. Scramjet
d. GTE

d

It is the combined the reliability of jets, with the efficiency of propeller driven aircraft at low to mid altitudes.
a. Turbocharged Reciprocating Engine
b. Ramjet
c. Turboshaft
d. Turboprop

d

It is a variant of ramjet air breathing jet engine in which combustion takes place in supersonic airflow.
a. Ramjet
b. Pulsejet
c. Turbojet
d. Scramjet

d

What are the two main reasons why the GTE has superseded the reciprocating engine?
a. Weight and Thrust
b. Operability and Efficiency
c. Portability and Streamlining
d. Reliability and High Power to Weight Ratio

b

The gas turbine engine can only be applied in the aviation industry
a. True
b. False
c. ambot langs
d. murag pwede

c

A large fan is located aft of the inlet section, used to duct the air into a bypass section. This GTE is a:
a. Turboprop
b. Turbojet
c. Turbofan
d. Turboshaft

d

The most widely used air breathing engine, can be commonly found in commercial aircraft and other corporate aircraft.
a. Rocket
b. Ramjet
c. Pulsejet
d. GTE

d

The gas turbine engine follows the thermodynamic cycle known as:
a. Steam Cycle
b. Jet Cycle
c. Otto Cycle
d. Brayton Cycle

d

Which of the following has the most MTBF?
a. Rocket
b. Pulsejet
c. Turbofan
d. Ramjet

c

In high by-pass engine with a ‘pitot’ intake, with the engine running and the brakes on, what will P1 be in relation to P0?
a. same
b. greater
c. less
d. 14.7 psi

b

What is the purpose of the supersonic diffuser in the variable throat intake?
a. Final reduction in velocity prior to compressor face.
b. Interim reduction in velocity in below Mach 1 prior to a further reduction in the subsonic diffuser
c. Interim reduction in velocity to below Mach .5 prior to a further reduction in the subsonic diffuser
d. Increase in velocity prior to compressor face

b

The ring of blades which sometimes precede the first rotor stage of an axial flow compressor are called:
a. The first stage stator blades
b. The inlet guides vanes
c. First stage diffuser blades
d. Nozzle guide vanes

c

Shrouding the stator blade tips is designed to:
a. Prevent tip turbulence
b. Ensure adequate cooling
c. Minimise Vibration
d. Prevent tip losses

a

The attachment of blades to the compressor disc:
a. Allows slight movement to relieve stress concentration
b. Is rigid
c. Prevents them being contaminated by the atmosphere
d. Allows slight movement because of the difference expansion rates of the blades and the disc which would otherwise cause center line closure

d

The ratio of air to kerosene to give the greatest heat release during combustion is:
a. 45:1
b. 130:1
c. 12.5:1
d. 15:1

d

The air entering the combustion chamber is divided: a small percentage is used in combustion, the rest:
a. is syphoned off for airframe anti-icing purposes
b. is used only for cooling the gases before they exit the combustion chamber
c. is used to reduce the oil temperature and cool the turbine blades
d. is used to cool both the gases existing the chamber and the walls of the air casing

b

Swirl vanes in the combustion chamber:
a. increase the velocity of the airflow
b. reduce the velocity of the airflow
c. Prevent compressor stall
d. Help to stabilize combustion

a

The purpose of the tertiary airflow created in the combustion chamber is to:
a. Reduce the gas temperature and cool the flame tube
b. Form a toroidal vortex, which anchors and stabilises the flame
c. Reduce the gas temperature and cool the burner head
d. Ensure complete combustion of the fuel

c

The effect on the temperature and pressure of the gases as they pass across the turbine is
a. Their temperature decreases and their pressure rises
b. Both their temperature and pressure increases
c. Both their temperature and pressure decreases
d, Their temperature increases and their pressure falls

a

The mixture of impulse and reaction blade shape in the average turbine blade is such that:
a. The inner half is impulse and the outer half is reaction
b. The inner half is reaction and the outer half is impulse
c. the leading edge is reaction and the trailing edge is impulse
d. The trailing edge is reaction and the leading edge is impulse

d

Blade creep is:
a. Movement of the turbine blades around the turbine disc
b. Temporary expansion due to temperature change
c. Temporary elongation due to centrifugal forces
d. Permanent elongation due to heat and centrifugal force

c

At what point in an axial-flow turbojet engine will the highest gas pressures occur?
a. At the turbine entrance
b. within the burner section
c. At the compressor outlet
d. outside the burner section

c

One function of the nozzle diaphragm in a turbine engine is to?
a. Decrease the velocity of exhaust gases
b. Center the fuel spray in the combustion chamber
c. Direct the flow of gases to strike the turbine blades at a desired angle

b

What is the profile of a turbine engine compressor blade?
a. The leading edge of the blade
b. A cutout that reduces blade tip thickness
c. The curvature of the blade root

a

The fan rotational speed of a dual axial compressor forward fan engine is the same as the
a. Low pressure compressor
b. Forward turbine wheel
c. High pressure compressor

a

What turbine engine section provides for proper mixing of the fuel and air?
a. Combustion section
b. Compressor Section
c. Diffuser section

b

In a gas turbine engine, combustion occurs at a constant
a. Volume
b. Pressure
c. Density

b

Which statement is true regarding jet engines?
a. At the lower engine speeds, thrust increases rapidly with small increases in RPM
b. At the higher engine speeds, thrust increases rapidly with small increases in RPM
c. The thrust delivered per pound of air consumed is less at high altitude at low altitude

a

Some high-volume turboprop and turbojet engines are equipped with two-spool or split compressors. When these engines are operated at high altitudes, the
a. low pressure rotor will increase in speed as the compressor load decreases in the lower density air
b. throttle must be retarded to prevent over speeding of the high-pressure rotor due to the lower density air.
c. low-pressure rotor will decrease in speed as the compressor load decreases in the lower density air

b

Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used in the gas turbine engine to
a. decrease the velocity of the heated gases flowing past this point
b. direct the flow of gases parallel to the vertical line of the turbine blades
c. increase the velocity of the heated gases flowing past this point.

c

Where is the highest gas pressure in the turbojet engine?
a. at the outlet of the tailpipe section
b. at the entrance of the turbine section
c. In the entrance of the burner section

a

An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to
a. increase and the velocity to decrease
b. increase and the velocity to increase
c. decrease and the velocity to increase

a

What is the function of the stator vane assembly at the discharge end of a typical axial-flow compressor?
a. To straighten airflow to eliminate turbulence
b. To direct the flow of gases into the combustion chambers
c. To increase air swirling motion into the combustion chambers

c

the turbine section of a jet engine
a. increases air velocity to generate thrust forces
b. Utilize heat energy to expand and accelerate the incoming gas flow
c. drives the compressor section

b

In the dual axial flow or twin spool compressor sytem, the first stage turbine drives the
a. N1 and N2 compressors
b. N2 compressor
c. N1 compressor

c

What are the two basic elements of the turbine section in a turbine engine?
a. Impeller and diffuser
b. Hot and cold
c. Stator and rotor

c

The function of the exhaust cone assembly of a turbine engine is to
a, collect the exhaust gases and act as a noise suppressor
b. swirl and collect the exhaust gases into a single exhaust jet
c. straighten and collect the exhaust gases into a solid exhaust jet

c

What are the two functional elements in a centrifugal compressor
a. Turbine and compressor
b. bucket and expander
c. Impeller and diffuser

a

A turbine engine compressor which contains vanes on both sides of the impeller is a
a. double entry centrifugal compressor
b. double entry axial-flow compressor
c. single entry axial-flow compressor

b

How does a dual axial flow compressor improve the efficiency of a turbojet engine?
a. more turbine wheels can be used
b. higher compression ratios can be obtained
c. the velocity of the air entering the combustion chamber is increased

c

An advantage of the axial flow compressor is its
a. low staring power requirement
b. low weight
c. high peak efficiency

b

What is the purpose of the stator blades in the compressor section of a turbine engine?
a. stabilize the pressure of the airflow
b. control the direction of the airflow
c. increase the velocity of the airflow

a

What is the purpose of the diffuser section in a turbine engine?
a. To increase pressure and reduce velocity
b. To convert pressure to velocity
c. To reduce pressure and increase velocity

c

The diffuser section of a jet engine is located between
a. the burner section and the turbine section
b. Station no. 7 and station no.8
c. The compressor section and the burner section

b

The highest heat-to-metal contact in a jet engine is the
a. burner cans
b. turbine inlet guide vanes
c. turbine blades

a

The two types of centrifugal compressor impellers are
a. single entry and double entry
b. rotor and stator
c. impeller and diffuser

c

What is meant by a double entry centrifugal compressor?
a. A compressor that has two intakes
b. A two-stage compressor independently connected to the main shaft
c. a compressor with vanes on both sides of the impeller

b

What is the major function of the turbine assembly in a turbojet engine?
a. Directs the gases in the proper direction to the tailpipe
b. supplies the power to turn the compressor
c. Increases the temperature of exhaust gasesa

c

What type of turbine blade is most commonly used in aircraft jet engines?
a. Reaction
b. impulse
c. Impulse-reaction

a

What is the primary factor which controls the pressure ratio of an axial-flow compressor?
a. Number of stages in compressor
b. Compressor inlet pressure
c. Compressor inlet temperature

a

The stators in the turbine section of a gas turbine engine
a. increase the velocity of the gas flow
b. decrease the velocity of the gas flow
c. increase the pressure of the gas flow