Why are dynamic heads greater than static heads?
1. because static suction lifts are limited in vertical lift
2. because the friction losses are always greater than the
static heads
3. because they are measured on the discharge side of the
pump
4. because they include the static heads plus the friction
losses in the suction and discharge pipes

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?