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Questions and Answers
What is the primary measure of output for a turboprop engine?
What is the primary measure of output for a turboprop engine?
Which feature of the turboprop engine helps to reduce drag?
Which feature of the turboprop engine helps to reduce drag?
In what situation does the negative torque signal (NTS) increase the propeller blade angle?
In what situation does the negative torque signal (NTS) increase the propeller blade angle?
What is the purpose of the thrust sensitive signal (TSS) in a turboprop engine?
What is the purpose of the thrust sensitive signal (TSS) in a turboprop engine?
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Which advantage of the turboprop engine is specifically due to its engine design?
Which advantage of the turboprop engine is specifically due to its engine design?
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What component of the turboprop engine is responsible for pitch control on the propeller?
What component of the turboprop engine is responsible for pitch control on the propeller?
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What condition can lead to negative torque in a turboprop engine?
What condition can lead to negative torque in a turboprop engine?
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Which of the following describes the function of the reduction gear assembly in a turboprop engine?
Which of the following describes the function of the reduction gear assembly in a turboprop engine?
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What happens to the blade angle of the propeller when the thrust sensitive signal (TSS) is activated?
What happens to the blade angle of the propeller when the thrust sensitive signal (TSS) is activated?
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Which of the following is NOT an advantage of turboprop engines?
Which of the following is NOT an advantage of turboprop engines?
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What mechanism is involved in enhancing the power-to-weight ratio of turboprop engines?
What mechanism is involved in enhancing the power-to-weight ratio of turboprop engines?
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Which of the following features assists in synchronizing multiple propeller pitch angles?
Which of the following features assists in synchronizing multiple propeller pitch angles?
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What occurs during a temporary fuel interruption related to the negative torque signal?
What occurs during a temporary fuel interruption related to the negative torque signal?
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What is the primary function of the thrust sensitive signal during takeoff?
What is the primary function of the thrust sensitive signal during takeoff?
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Which aspect of turboprop engines contributes to their low vibration characteristics?
Which aspect of turboprop engines contributes to their low vibration characteristics?
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What characteristic primarily allows turboprop engines to have a short landing roll?
What characteristic primarily allows turboprop engines to have a short landing roll?
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During which scenario is the thrust sensitive signal crucial for safety?
During which scenario is the thrust sensitive signal crucial for safety?
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Which advantage of a turboprop engine is influenced by its design for lower air speeds?
Which advantage of a turboprop engine is influenced by its design for lower air speeds?
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What is the main purpose of the control assembly within a turboprop engine?
What is the main purpose of the control assembly within a turboprop engine?
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Which of the following statements about the turboprop engine features is incorrect?
Which of the following statements about the turboprop engine features is incorrect?
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Study Notes
Turboprop Engine Overview
- A turboprop engine uses a gas turbine to power a propeller.
- Shaft horsepower is the measure of the engine's output.
Introduction to Turboprop Engines
- Turboprop engines use a gas turbine to power a propeller, providing a good combination of efficiency and power.
- Components include the turbo-propeller assembly, negative torque signal (NTS) system, thrust sensitive signal (TSS) system and reduction gear assembly.
Turboprop Engine Advantages
- Rapid acceleration during takeoff
- Efficient at low altitudes and low speeds
- Short landing roll due to propeller braking action
- Low engine vibration
- High power-to-weight ratio for the aircraft
Turboprop Engine Features
- Gear reduction drive
- Free turbine
- Counter-rotating spools
- Reverse pitch
- Negative Torque Signal (NTS)
- Thrust Sensitive Torque Signal (TSS)
Turbo-Propeller Assembly
- A cone-shaped spinner assembly is used to reduce drag.
- An afterbody assembly, not rotating, encloses the control assembly on the gearbox.
- The control assembly houses the fuel reservoir, pumps, valves, and hydraulic actuators to control propeller pitch.
- A synchronophasing system synchronizes the pitch of multiple propellers.
Negative Torque Signal (NTS)
- A system to sense and react to negative torque, which occurs during temporary fuel interruptions, air gusts, or engine shutdown.
- The system increases propeller blade angle to limit negative shaft torque. The mechanism uses specific parts like a helical spline coupling, NTS spline ring, ring gear coupling, planet gear, rear plate ring gear, front plate, plunger, and reduction gear case, as well as an NTS actuator rod.
Thrust Sensitive Signal (TSS)
- A safety system that automatically feathers the propeller during power loss during takeoff, limiting the risk of yawing in multi-engine aircraft.
- It automatically increases the blade angle to 90°, causing the propeller to feather.
Free Turbine
- A turbine that is not mechanically connected to the compressor.
- It extracts energy directly from the gases to do work, independent of the compressor.
Reduction Gear Assembly
- The assembly consists of a single propeller drive shaft, NTS and TSS systems, a safety coupling, propeller brake, and a dry sump oil system.
- The brake prevents windmilling (propeller spinning in the opposite direction and reducing efficiency) of the propeller blades. The various gear components include pinion–input gear, ring gear, front case, prop shaft, NTS actuator rod, spring and plunger, safety coupling, starter gear, prop brake, starter shaft, prop-brake outer member, accessories idler gear, main drive gear, gear train, bearing diaphragm, and rear case.
Recap of Topics to Study
- The measuring unit of turboprop power output
- The functionality of the synchronophasing system of the turboprop engine
- The functionality of the NTS system of the turboprop engine
- The functionality of the TSS system of the turboprop engine
- The components involved in the reduction gear assembly
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Description
Explore the fundamentals of turboprop engines, which use gas turbines to drive propellers and achieve an efficient power-to-weight ratio. This quiz covers key components, advantages, features, and technical aspects such as the NTS and TSS systems. Perfect for aviation enthusiasts and engineering students alike!
