Questions about Rolls Royce's jet engine

Here I post all the questions I solved in the Rolls Royce's web page: 

1-Why are turbine blades coated with a ceramic material?

A)It makes them lighter 

B)It helps make them stronger 

C)It helps to stop them melting-

D)It makes them a better colour

2-Why can’t titanium be used to make turbine blades?

A)In temperatures over 600ºC where it rubs against other metals, it can burn-

B)It is too dense and would be too heavy to use

C)It is the wrong colour

D)It is too expensive

3-Drag and drop the densities to the correct material:

Titanium 6/4: 4.5g/cm3

Nickel alloy 8.2g/cm3

Partially yttrium stabilized zirconia: 5.1g/cm3

Nickel super alloy: 8.4g/cm3

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 colour

C)Weight and name 

D)Cost and weight -

5-Which statement is true?

A)To active 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 low velocity-

B)To active the same amount of thrust you can either accelerate a

Small mass of air to small velocity or a large mass of air to a low velocity

C)To active the same amount of thrust you can either accelerate a

Small mass of air to high velocity or a large mass of air to a high velocity

D)To active the same amount of thrust you can either accelerate a

Small mass of air to 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 a temperature of 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-If an engine has an efficiency of 40% how much chemical energy is needed to proceed 8000kJ of kinetic energy?

A)2000kJ

B)4000kJ

C)20000kJ-

D)40000kJ

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 aeroplane forward

D)A jet engine works 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 that blows high pressure gas 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 modelling

13-Fan blades feel up to a 100 ton force of centrifugal load when an aircraft is flying, what weight is this equivalent to?

A)1 elephant 

B)2 elephants

C)5 elephants

D)13 elephants -

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 aeroplane 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 times the power of a small family car-

D)20 times the power of a small family car 

16-What parts of the engine does the turbine power?

A)None 

B)The fan and compressor-

C)Only the fan

D)Only the compressor

17-Which of the following properties makes titanium ideal for fan blades

A)It is very light 

B)It is very cheap

C)It is silver coloured

D)It repels birds

18-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 colour

19-Choose the correct sequence of materials in order of density:

SLOT 1: Air SLOT 2:Water SLOT3: Titanium: SLOT 4:Nickel

20-Nickel alloys are used in compressors and turbine blades because it is resistant to creep. What is creep?

A)Creep is how good the metal is at conducting heat-

B)Creep is when metal shrink when they get hot

C)Creep is how good a metal is at conducting electricity 

D)Creep is when metals under high temperatures break as they get older

21-What happens to the temperature of air as it goes through the compressor of a jet engine?

A)It gets hotter-

B)It gets colder

C)It doesn’t change 

D)It can go up or down 

22-What is the efficiency of an engine that uses 500kJ of chemical energy to make 20kJ of kinetic energy?

A)10%

B)40%

C)20%

D)50%

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

SLOT 1: Heat SLOT 2: Light SLOT 3: Sound

24-How are fan blades med strong, yet light?

A)They are solid 

B)They are hollow with an internal girder structure

C)They have hydrogen added

D)They are as thin as two sheets of paper

25-What is the material called that stops parts of the titanium sheets used to make the fan blades from sticking together?

A)Stop-off

B)Keep away

C)Don’t stick

D)Glue

26-What is the proceed called that 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

27-What two processes are used to make compressor blades?

A)Welding and grinding

B)Welding and forging

C)Pouring and welding

D)Forging and grinding

28-Drag and drop the temperatures next to the right parts of the engine:

Fan: 25ºC Compressor: 1300ºC Combustor 1600ºC Turbine 230ºC

29-What is bypass air?

A)Air that goes past the aircraft without going into the engine 

B)Air that pushed by the fan and goes through the compressor

C)Air that is pushed by the fan but does not go through the compressor 

D)All the air that is pushed by the fan 

Put the following parts of a jet engine in order: 

SLOT 1: Fan SLOT 2: Compressor SLOT 3: Combustor SLOT 4: Turbine

31-What is the name for materials such as ceramics that do not let heat energy pass through them:

A)Insulators

B)Conductors

C)Metals 

D)Composites

32-Drag and drop the pressures next to the right parts of the engine:

Fan: 10PSI Compressor: 60 PSI Combustor: 250 PSI Turbine: 100 PSI