AVSC 3300 JET TRANSPORT
SYSTEMS EXAM QUESTIONS AND
ANSWERS
Centrifugal-flow compressors are more durable than Axial-flow models. - Correct
Answers -True
What is the advantage of using a dual-compressor in a turbine engine? - Correct
Answers -They deliver higher compression ratios than single-compressor models
What is a unit consisting of more than one compressor stages known as in a turbine
engine? - Correct Answers -A multi-stage compressor
What does the Nozzle do on a turbine engine? - Correct Answers -It accelerates the
velocity of the high-energy gases escaping from the gas generator
In a turbine engine, each compressor wheel or row of rotor and stator blades is defined
as one _____. - Correct Answers -Compressor stage
An axial-flow compressor is made up of an alternating series of _____. - Correct
Answers -Rotating rotor blades and stationary stator vanes
The high-pressure compressor is driven by the high-pressure turbine and is referred to
as the_____shaft. - Correct Answers -N2
What is the term used to describe a turbine engine that uses two compressors in
tandem that are mounted on separate shafts and turn a different speeds. - Correct
Answers -Dual-compression engine
What do Gas turbine engines share jet propulsion principles with? - Correct Answers -
Party balloons that have been inflated and released
A centrifugal-flow compressor can normally attain a compression ratio of 10:1, but an
axial-flow model may achieve ratios of more than _____. - Correct Answers -25:1
, During engine start on a turbine engine, what is used to light the fuel-air mixture in the
combustion chamber? - Correct Answers -Igniters
In jets_____refers to the ratio of engine output pressure to engine intake pressure. -
Correct Answers -Engine pressure ratio
In a_____turboprop engine, the propeller is driven directly from the compressor shaft
through a reduction gear assembly. - Correct Answers -Direct Drive
Mark the characteristics of turbojet engines. Mark all that apply - Correct Answers -
Good performance at high speeds
Inefficient at low speeds
Inefficient at low altitudes
Good performance at high altitudes
How does bypass air affect the performance of a turbofan engine? - Correct Answers -
Bypass air generates a great deal of thrust
Turbofan engines are louder and less fuel efficient than turbojet engines. - Correct
Answers -False
What is bypass air? - Correct Answers -The portion of intake air that flows through the
fan section rather than through the gas generator section of the engine.
Regarding turbojets, turbofans, and turboprops the largest conceptual difference
between these engines is_____. - Correct Answers -How engine output is translated
into thrust to propel and aircraft
How does a turboprop create a reverse thrust? - Correct Answers -Propeller blade
angle is gradually changed from positive blade angle to negative blade angles
_____turboprop engine's propeller is not connected directly to the engine core, but
derives its torque from the power section added to the basic engine core after the
turbine section. - Correct Answers -A free-turbine
What is an electrical open? - Correct Answers -An un-commanded interruption of
electrical supply to an electrical component
Why are hydraulics preferred over cables and pulleys in large aircraft systems? -
Correct Answers -Cable stretch, mechanical linkages wear over time and metal cables
are heavy
SYSTEMS EXAM QUESTIONS AND
ANSWERS
Centrifugal-flow compressors are more durable than Axial-flow models. - Correct
Answers -True
What is the advantage of using a dual-compressor in a turbine engine? - Correct
Answers -They deliver higher compression ratios than single-compressor models
What is a unit consisting of more than one compressor stages known as in a turbine
engine? - Correct Answers -A multi-stage compressor
What does the Nozzle do on a turbine engine? - Correct Answers -It accelerates the
velocity of the high-energy gases escaping from the gas generator
In a turbine engine, each compressor wheel or row of rotor and stator blades is defined
as one _____. - Correct Answers -Compressor stage
An axial-flow compressor is made up of an alternating series of _____. - Correct
Answers -Rotating rotor blades and stationary stator vanes
The high-pressure compressor is driven by the high-pressure turbine and is referred to
as the_____shaft. - Correct Answers -N2
What is the term used to describe a turbine engine that uses two compressors in
tandem that are mounted on separate shafts and turn a different speeds. - Correct
Answers -Dual-compression engine
What do Gas turbine engines share jet propulsion principles with? - Correct Answers -
Party balloons that have been inflated and released
A centrifugal-flow compressor can normally attain a compression ratio of 10:1, but an
axial-flow model may achieve ratios of more than _____. - Correct Answers -25:1
, During engine start on a turbine engine, what is used to light the fuel-air mixture in the
combustion chamber? - Correct Answers -Igniters
In jets_____refers to the ratio of engine output pressure to engine intake pressure. -
Correct Answers -Engine pressure ratio
In a_____turboprop engine, the propeller is driven directly from the compressor shaft
through a reduction gear assembly. - Correct Answers -Direct Drive
Mark the characteristics of turbojet engines. Mark all that apply - Correct Answers -
Good performance at high speeds
Inefficient at low speeds
Inefficient at low altitudes
Good performance at high altitudes
How does bypass air affect the performance of a turbofan engine? - Correct Answers -
Bypass air generates a great deal of thrust
Turbofan engines are louder and less fuel efficient than turbojet engines. - Correct
Answers -False
What is bypass air? - Correct Answers -The portion of intake air that flows through the
fan section rather than through the gas generator section of the engine.
Regarding turbojets, turbofans, and turboprops the largest conceptual difference
between these engines is_____. - Correct Answers -How engine output is translated
into thrust to propel and aircraft
How does a turboprop create a reverse thrust? - Correct Answers -Propeller blade
angle is gradually changed from positive blade angle to negative blade angles
_____turboprop engine's propeller is not connected directly to the engine core, but
derives its torque from the power section added to the basic engine core after the
turbine section. - Correct Answers -A free-turbine
What is an electrical open? - Correct Answers -An un-commanded interruption of
electrical supply to an electrical component
Why are hydraulics preferred over cables and pulleys in large aircraft systems? -
Correct Answers -Cable stretch, mechanical linkages wear over time and metal cables
are heavy
