Slim 75,
By definition the answer (and it is a poor question, if it is asked in an interview, and probably reveals more about the knowledge (or lack thereof) of the interviewer than the interviewee) "Yes".
It a bit like asking to define "2", and asking is "2" always equal to "2".
Having said that, there are often considerable advantages, in doing performance calculations, to "unbalance" the field length, ie: the accelerate/stop distance and the distance to clear the "screen height" are not the same, ie: not "balanced".
Tootle pip!!