Dean,


I hope your right my friend cos thats what i put in the exam!!!I know of people who also agree!!

Its one of them questions that you just seem to take for granted and assume you have got right....................but when you get out of the exam hall and you start thinkin about your reasonin for what you put, it makes you start to over evaluate the situation and you end up worryin yourself stupid just tryin to convince yourself you have failed!!! Thinkin of every possible reason that your answer was not the right one!!!:rolleyes: :rolleyes:

RowleyUK,

I'm sure you'll be fine mate, and I know that feeling when you start to question yourself, its bloody horrible.

Anyway you might know in the morning, its a good chance the results will be going out tonight.

Best of luck to everyone.

D.J.

Cheers Dean....I hope your right!

Anyway......followin any interest or help from schools or people in the know, i decided to turn to my only hope and asked Jeeves!!!


The question went along the lines................

After the power stroke, what valves are open?

This is his answer.......................

Shortly before the piston reaches the top dead center of its stroke, the fuel, atomized by high pressure is injected into the combustion chamber. The fuel is ignited by the high temperature of the air and continues to burn until the charge is consumed. The burning charge rapidly builds up a high pressure which acts upon the piston, forcing it downward on the power stroke.

Fig. 0-3d. just before the piston reaches the end of the power stroke, the exhaust valves open, releasing the gases to the atmosphere. The piston then uncovers the air inlet ports. By this time the exhaust gases have expanded to the point where the pressure is lower in the cylinder than in the air-box. The cycle is then repeated.


So is it the Outlet or both???

I reckon its the outlet!

How do you know the results could be here tomorrow??? It normally takes two weeks and given that there was an appeal on one of the questions, i can only assume that this will give the CAA an excuse to delay the postin of the results!!!

I agree that only the exhaust valve is open at the end of the power stroke. Had the question said "At the point of finishing the power stroke, which valves are open". We would all be happy.

Half the problem with these questions is that in subjects such as PoF it's vital to consider points in time in order to fully understand the theory. For example, at the point of alpha crit an aerofoil produces maximum lift; but you could argue that at alpha crit, the aerofoil starts losing lift.

Simply stating "after the power stroke" is not clear enough.

I found this animation of the Otto Cycle

Fingers crossed for the results, good luck to all. :ok: I really don't have a clue if I passed or failed miserably and that troubles me...:rolleyes:

Yeah i agree...............Oultet it is then!!

Good luck to everyone if its tomorrow!! :t

My situation= 4 definately wrong, 4pure guesses 4, pretty uncertain about the answers!! so thats 12 gone already (assuming the worst)

Looks like another pink sheet is on its way!!!!

Answering this paper was pure pot luck:confused: What about the apu Question, Does it supply Electricity in the air and on the ground or is this a type specific question, I wonder. Anyway best of luck to everyone

Critical Alpha,

I put that question regarding APU's to Alex At BGS and said that some APU's suppy only electrics, and some supply electrics and bleed-off air. So electrics only, or electrics and air con. It depends on type.

i'm getting more confused with all this 5h!t.

D.J.

If I recall, I answered electrics and air-con, simply because I thought that's what the JAA were looking for...it's a worry isn't it? :rolleyes:

BTW...no envelope this morning...:p

No results today:rolleyes:

Sure was Pot Luck!!

What about the questions:

In a modern Jet aircraft, landing forces are dampened by what?

A.Nitrogen and viscous fluid
B.Nitrogen
C.Hydrogen
D.Oxygen

are they talking about what supports the weight of the aircraft?.......then it would be nitrogen only............or are they talkin about the whole events during a landing.............in which case it would be nitrogen and viscous fluid!!!!!!

What is shimmy?

A. potentially damaging vibration of the nose wheel
B. Movement of the nosewheel in the time between the input from the control wheel and the reaction of the wheels

Could be both id say but i went for A!!


Alternators are connected in?

A.Parallel
B.Series
C. Dependant upon engine
D. Dependant upon generator

I know generators are normally connected in parallel but the option of 'dependant upon the engine' is also a possibility!!


Why is the fuel pressurised before entering the pump?

A.to prevent pump cavitation
B.to prevent vapour locks

Could be either of the two again..........i went for pump cavitation myself.........but there is also a valid reason how it would prevent vapour locks!!


As Alex says: There should be one right answer and three wrong answers!!..............

In this exam, I just dont belive that was the case!!!!:* :mad: :confused: MOST UNFAIR!!!