Problem #1 Mid Term Exam 2004

a) Normally steady state except during startups or changing operations.
   Open
   non-reactive
b) Dynamic if there are plants present
   Open
   Reactive
c) Dynamic if people are living in it
   Closed unless people and supplies arrive or there are losses
   Reactive if people are living there

a) Generation and consumption and possibly accumulation unless dynamic
reduces to input=output in steady state case
b) all terms are needed except maybe generation and consumption
c) might be able to neglect all terms. No input or output or accumulation would make it: consumption=generation.