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turbine engine designs/familiarization
(Familiarization/Daily quiz/ Review)
Questions With Complete Solutions
The CFM56 is a ____ engine - Turbofan The CMF56 is a ____ -spool design - Dual The CMF56 is a ____ _bypass engine - High The CMF56 engine is known as a ____ design - Modular The fan and booster compressor stages make up the ____ pressure compressor. - Low The combustor section is located between the ____ -pressure compressor section and the ____ -pressure turbine. - High, High The high-pressure turbine is a ____ -stage unit. - Single The low-pressure turbine is a ____-stage unit. - Four The accessory drive module is driven by the ____ pressure compressor. - High The CMF56-7B27 engine has a bypass ratio of __ to 1 - 6. The PT6-34 is a ____ engine - Turboprop
The PT6 is described as a ____ -turbine engine - Free The PT6 is also described as a ____-shaft engine - Two The PT6 engine contains a combination ____ -stage axial flow and one-stage, centrifugal flow compressor - Three The turbine section of a PT6 contains ____ turbine wheel to drive the compressor - One The turbine section contains ____ turbine wheel to drive the power output shaft - One The PT6 combustor is a ____ -flow annular type - Reverse PT6: Propeller RPM is ____ when the engine is at 100 percent N2 speed for take off - 2, PT6: The ESHP available for takeoff is ____ - 823 This ESHP includes __ pounds of jet Thrust. - 82 The PT6A-34 has a mass airflow of 6.5 ____ per second. - pounds The JT8D is a ____ engine - turbofan The cold stream and hot stream merge at the ____ before discharging to the atmosphere. - Exhaust The JT8D Contains ____ -Spool axial flow compressor - Dual
Allison-250: Its turbine section contains ____ wheels to drive the power output shaft - Two Allison-250: The compressor (Gas producer) turbine is located toward the ____ of the engine - Rear Allison-250: The combustor is of the ____ -Flow type - Reverse Allison-250: The Combustor Contains ____ liner - One Allison-250: The exhaust at the ____ section of the engine - Mid Allison-250: At takeoff power (100 percent power turbine speed) this engine produces ____ SHP - 420 The Allison 250-C20B has a compression ratio of ____to 1. -
Two-stroke, Radial, and rotary engines are considered a turbojet engine> TRUE/FALSE - FALSE What is the difference between a turbofan and a turbojet engine?
- The turbofan utilizes bypass air for some thrust whereas the turbojet produces all of it from the engine core. What is the bypass ratio of a medium bypass turbofan engine? - 2:1 - 3.9: Where is the primary air produced on a turbofan engine? - Core of the engine
Where is the low pressure turbofan (LPT) located on a modern Turbofan engine? - First stage of the engine (inlet) Which engine produces more thrust for the same fuel input? - Turbofan Compared to turboprop and turbofan powered aircraft of equivalent size and power, the turbojet powered aircraft would be best for: - High altitude, High speed, Long distance flights. What does N1 indicate on newer turbine fan enignes? - It indicates % of RPM The fan blade tip may travel speed of sound while the rest of the blade travels sub sonic (The speed of sound is 760 MPH) TRUE/FALSE - TRUE Turboprop airplanes uses 3 levers to control the power output. TRUE/FALSE - FALSE Propfan engines were developed in response to rising fuel prices. The engine is also known as a unducted fan engine. The bypass ratio is between 30:1 and 100:1. They are still in the experimental stages. All the previous statements are... TRUE/FALSE - TRUE A free (power) turbine connects to and drives the : - Engine Output What does NG represent - The speed of the gas generator section
Turboshaft engines are not limited by airspeed or altitude and they have a high TSFC (Thrust Specific Fuel Consumption) TRUE/FALSE - TRUE What is an APU in aviation? - Auxiliary Power Unti Without using the aircraft engines, power can be supplied to the aircraft from .... - APU,GPU, and EPU Where is an APU normally located? - In the tail What kind of fuel does an APU use? - Uses jet fuel from the aircraft's fuel tanks. The start procedure of an APU on an aircraft. (correct order) - 1. Battery switch on.
- Master switch on.
- Push start switch.
- monitor engine indications.
- turn on generator and air when run/ready light is on. An APU only supplies A/C electric power to the aircraft? TRUE/FALSE - FALSE What else could an APU provide besides electrical power? - Cabin pressurization, Air conditioning, Hydraulics, Pneumatics Most aircraft have an APU installed in the tail? TRUE/FALSE - TRUE
Turbofan engines are the best for low altitude, low speed, short distance flights. TRUE/FALSE - TRUE The turbojet derives its thrust by highly accelerating a small mass of air, all of which goes through the engine. TRUE/FALSE
- TRUE Where is the primary air produced on a turbofan engine? - Core of the engine The turbojet has the lowest thrust specific fuel consumption (TSFC) in relation to turboprop and turbofan engines. TRUE/FALSE - False The team free turbine in relation to a turboshaft engine refers to a turbine that is NOT connected to a compressor. TRUE/FALSE
- TRUE A turboprop of turboshaft engine extracts more energy from the hot velocity gases passing through the turbine section because they have less turbine stages. TRUE/FALSE - False An APU can supply electrical or pneumatic power to the aircraft only while its on the ground. TRUE/FALSE - FALSE The auxiliary power unit RPM is being controlled with a power control lever in the cockpit. TRUE/FALSE - FALSE A turboprop engine with a free turbine consists of a compressor, combustor and a compressor's turbine in the gas generator section. TRUE/FALSE - TRUE
The turbofan engine efficiency is increased over the turboject engine by: - Converting more of the fuel energy into pressure energy for thrust. The term "Spool" can be defined as: - A turbine and whatever it drives. The term "stage" could be defined as: - A rotor and it's stator N1 can refer to: - Low pressure The NG section consist of the compressor section, combustor section, compressor's turbine section and the accessory box. TRUE/FALSE - TRUE What does NG refer to: - The core gas generator section. The free turbine section can be referred to as NF, Np, PT or even N2 depending on engine manufacturer. TRUE/FALSE - TRUE What type of oil does an APU use for lubrication? - A synthetic oil, same as the main engines What is the primary thrust indication for turbojet engines? - EPR Percent of torque is the primary output indication of which engines? - turboprop & turboshaft Choose the correct statement in regards to a turbofan engine.
Primary airflow goes through the engine core.
Secondary airflow turns the fan. Secondary airflow goes through the engine core. - > Primary airflow goes through the engine core.
