Rolls Royce engine´s questionary.

ROLLS ROYCE ENGINE'S QUESTIONS

1. What is the name for materials such as ceramics that not let heat energy pass through them?

a) Insulators 👌
b) Conductors
c) Metals
d) Composites



2. Why are turbine blades coated with a ceramic material?

a) It helps make them stronger.
b) It helps to stop them melting.👌
c) It helps make them lighter.
d) It makes them a better color.

3. Drag and drop the densities to the correct materials:

4,5g/m3 ---> Titanium 6/4
8,2g/m3 ---> Nickel Alloy
5,1g/m3 ---> Partially Yttria Stabilised Zirconia
8,4g/m3 ---> Nickel Super Alloy

4. What are the two main things engineers must consider when choosing materials to use in an engine?

a) Colour and weight
b) Cost and color
c) Weight and name
d) Cost and weight 👌

5. Which statement is true:

a) To achieve the same amount of thrust you can either accelerate a small mass of air to a high velocity or a large mass of air to low velocity. 👌
b) To achieve the same amount of thrust you can either accelerate a small mass of air to a small velocity or a large mass of air to low velocity.
c) To achieve the same amount of thrust you can either accelerate a small mass of air to a high velocity or a large mass of air to a high velocity.
d) To achieve the same amount of thrust you can either accelerate a small mass of air to a low velocity or a large mass of air to a high velocity.

6. Use the ideal gas law to work out the following: If 1m3 of gas with a pressure of 1Pa and temperature 200K is compressed to a volume of 0,5m3  at a constant temperature. What is the pressure?

a) 0,5Pa
b) 1Pa
c) 2Pa 👌
d) 4Pa

7.Choose the correct types of energy that are wasted when fuel is used to power a jet engine:

a) Sound
b) Kinetic 👌
c) Chemical 👌
d) Heat 👌
e) Light

8. Which of the following statements are true?

a) A jet engine works by making the air going through it less dense.
b) A jet engine works by making the air going through it colder.
c) A jet engine works by sucking air in to pull the airplane forward. 👌
d) A jet engines work by pushing air out of the back of the engine which in turn pushes the engine forward.

9. How are the walls of the combustor attached to the "head" at the front of the combustor?

a) Glued in place
b) Screwed in place
c) Welded 👌
d) Stapled together

10. What is special about the nickel alloy used in turbine blades?

a) They are grown from a single crystal of metal. 👌
b) They are very expensive.
c) They will never melt.
d) They are made from more than one crystal of metal.

11. What is the process called the blows high-pressure gas to shape the sheets of titanium used to make fan blades?

a) Ordinary plastic forming
b) Superplastic forming 👌
c) Welding
d) Grinding

12. What is the name of the process that makes cooling holes and other features in turbine Blades?

a) Drilling
b) Electro-discharge machining
c) Superplastic forming
d) Wax-modeling 👌

13. Drag and drop the pressures next to the right parts of the engine:

Fan ---> 10Psi
Compressor ---> 100Psi
Combustor ---> 250Psi
Turbine ---> 60Psi

14. What is the job of the compressor?

a) Pushes a large volume of air out of the back of the engine to push the airplane forward.
b) Squashes the air before fuel is added. 👌
c) Where fuel is added and burnt.
d) Takes energy from fast-moving air to drive the rest of the engine.

15. How much power does a first stage turbine blade take out of the gas stream?

a) The same as a small family car.👌
b) 5 times the power of a small family car.
c) 10 time the power of a small family car.
d) 20 times the power of a small family car.

16. Put the following parts of a jet engine in order:

1. Fan
2. Compressor
3. Combustor
4. Turbine

Air Florida accident, flight 90.

Hello again! 

After a few days, I’m here to tell you something new. Today I’m going to tell you what happened with the flight 90 of Air Florida. It occurs in 1982. A very cold day, one of the coldest.

The plane is being prepared to fly again. In the cockpit are the technic crew, is composed of the Captain and the first pilot, both unexperimented in the 737 airplane type.

The passengers are boarding, the cargo it’s already loaded and the last tasks are on the way.

One of them is the thaw service. Pilots are waiting for them cause without them, they aren't able to fly.

For win time the pilots consider to activate the reverses in the way to help, not knowing that the desition made, will be an enormous mistake. In consequence, the reverses froze the temperature sensor of the engine.

In addition, once the thaw service ended, anyone knew that the solution of the thaw agent was poor in front of the required levels.

When everything was apparently finished, they started the push-back. Running to the runway the accumulation of snow increased, helped by the airplane in front. The captain thought that the blast of that airplane will thaw his airplane, making a new mistake, not only the blast didn’t thaw but also helped the ice accumulation.

Once the aircraft was ready to take place in the runway the pilot asked the captain to repeat the thaw procedure but the captain didn’t want and continued with his thinks. At the same time, the pilot again sees that the instruments didn’t give normal parameter and once again the pilot advice to the captain and the captain didn’t react to this important information.

After all these factors we are able to see that it’s not just one mistake, it’s the result of a chain of bad desitions plus unexperimented pilots and a bad thaw service.

As you can imagine only a few seconds after taking off the airplane felt of the sky like a rock touching the land in a river after pass and kill people from a bridge.

The investigations cleared that the first and most important guilty was the Captain cause his performanceñ. Followed by the rest of the crew that didn’t advice about the new accumulation of ice after the thaw procedures. Guilt also of the thaw service and finally guilt of the delay on the ground that permitted to the ice to be accumulated again.