AC alternator core length

[mikhe]

In specifying an alternator (2000 kVA) why would I need to consider the core length?
I am being given four choices F,G,H & J for the same voltage and kVA rating.

 

[DougMSOE]

What might be implied in this question by the OEM is...
What output factor do you require?
This is an older way of tying together
1. KVA/KW
2. length of core
3. RPM
4. diameter of the core

 

[Shortstub]

Sounds to me that desired "footprint" is also an implied condition!

 

[mikhe]

apart from the physical properties I was trying to understand the operational benefits of specifying a longer core lenth for the same voltage and rating.

Mike