Turbine Blades and Types of Turbines Quiz

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What is the main task of the turbine in a turbojet engine?

Providing power to drive the compressor and accessories (correct)

Absorbing kinetic energy from the exhaust gases

Generating electricity for the accessories

Expanding gases to a higher pressure and temperature

Where is the turbine nozzle typically located in a gas turbine engine?

Aft of the turbine wheel (correct)

Around the stator elements

Directly in front of the combustion section

Inside the compressor

What percentage of the total pressure energy from the exhaust gases does the turbine absorb in a turbojet engine?

20-40%

60-80% (correct)

10-30%

90-100%

Which part of the gas turbine engine encloses the turbine rotor and stator assembly?

Turbine case (C) Signup and view all the answers

What does a stator element in the turbine section of a turbojet engine mostly refer to?

Turbine inlet nozzle (D) Signup and view all the answers

What is the primary role of the turbine in a gas turbine engine?

Transforming kinetic energy into mechanical energy (B) Signup and view all the answers

What method is used to prevent stress and warping of the vanes during thermal expansion in turbines?

Segmenting the shroud rings (A) Signup and view all the answers

What components make up the rotor element of the turbine section?

Shaft and wheel (B) Signup and view all the answers

What helps keep turbine blades and inlet nozzles cooler in engines?

Ceramic coating and air flow cooling (A) Signup and view all the answers

Why are most turbine blades precision cast and finish ground to the desired shape?

To enhance strength and heat properties (A) Signup and view all the answers

What does the assembly of turbine inlet nozzle vanes do to the turbine wheel?

Causes it to rotate at a high speed (B) Signup and view all the answers

Which part is referred to as the turbine disk without blades?

Turbine disk (A) Signup and view all the answers

What is the role of the disk in a turbine?

It anchors the turbine blades and transmits energy to the rotor shaft. (C) Signup and view all the answers

In an impulse turbine, what happens when the turbine blades change the direction of airflow?

No change in gas pressure or velocity occurs. (A) Signup and view all the answers

What type of turbine blade designs combine both impulse and reaction actions?

Reaction-impulse blades (C) Signup and view all the answers

How does a reaction turbine produce a turning force?

By forming converging ducts to increase gas velocity and reduce pressure. (B) Signup and view all the answers

What action does the turbine wheel perform in an impulse turbine?

Absorbs the force to change airflow direction (C) Signup and view all the answers

What is the purpose of combining impulse and reaction blade designs in a turbine?

To produce a lifting force similar to an airfoil (A) Signup and view all the answers

What is the primary function of the converging portion of the exhaust nozzle?

Accelerating the turbine exhaust gases to supersonic speed (B) Signup and view all the answers

Where is the accessory section typically located in a gas turbine engine?

Front or rear of the engine (C) Signup and view all the answers

What is one of the secondary functions of the accessory section in a gas turbine engine?

Acting as an oil reservoir (C) Signup and view all the answers

How does a converging-diverging duct increase engine thrust?

By accelerating exhaust gases to supersonic speed (A) Signup and view all the answers

What powers the accessories in a gas turbine engine?

Power taken from the engine's main power shaft (A) Signup and view all the answers

What role does the accessory gearbox play in a gas turbine engine?

Distributing power to each accessory drive pad (B) Signup and view all the answers

What is the main difference between a single-stage rotor turbine and multiple spool engines?

Single-stage rotor turbine uses one turbine rotor for power, while multiple spool engines have each spool with its own set of turbine stages. (B) Signup and view all the answers

Which type of engine is characterized by having a low-pressure spool and a high-pressure spool?

Turbofan engine (D) Signup and view all the answers

What is the function of the exhaust section in a gas turbine engine?

To direct the flow of hot gases rearward and prevent turbulence (A) Signup and view all the answers

In what way do the components of an exhaust section affect the flow of gases?

By directing the flow rearward and preventing turbulence (D) Signup and view all the answers

Which engine configuration is considered the simplest version of a pure turbojet engine?

Single-stage rotor turbine (C) Signup and view all the answers

What is the purpose of having multiple components in an exhaust section?

To direct and control the flow of hot gases to prevent turbulence (A) Signup and view all the answers