Service ceiling

[ben123]

Hello, I am curently studying aerospace engineering at college, I have 2 questions that i hope someone could help me with;

Q1) With a decrease in outside air temperature, the service ceiling of an aircraft will be :-

a) Reduced
b) Unaffected
c) Increased

Q2) Operation of the ‘stick shaker’ motor during landing :-

a) Reminds the pilot to lower the undercarriage
b) Indicates landing flap is selected
c) Means that the aircraft is near to stalling

Any comment on these questions would be appreciated, thankyou

[morroccomole]

1) no effect (I think)

2) the aircraft is near to stalling (I'm sure)

[Genghis the Engineer]

(1) Increased. For a given pressure altitude, a drop in temperature will increase air density and thus thrust. So, thrust to maintain level flight will be available at a greater pressure altitude.

G

[rwm]

Always pick C. Worked for me in school.

[mono]

Actually the first question is not too fair. The service ceiling is set by the manufacturer, and is the max alt to which the a/c is certified to fly at. It will usually be set at a lower altitude that the maximum altitude attainable by the a/c to allow for varying temperatures/density/humidity/etc. Soooo, in theory it shouldn't change.
However, I agree with Gengis in that a drop in temp will allow the a/c to operate at a higher altitude.

Badly worded IMHO.

:D

[asheng]

The answer to question 1 is C

and

The answer to question 2 is also C

[Kolibear]

I thought the service ceiling was when the rate of climb dropped to less than 100ft/min.