2. when a gfci senses a fault, the ground-fault current can originate from
a. either the hot or the neutral wire on the load side of the gfci.
b. either the hot or the neutral wire on the line side of the gfci.
c. only the hot wire on the line side of the gfci.
d. only the hot wire on the load side of the gfci.

Air (c-1.006 kj/kg.k, r-0.287 kj/kg.k) enters a nozzle steadily at 280 kpa and 77°c with a velocity of 50 m/s and exits at 85 kpa and 320 m/s. the heat losses from the nozzle to the surrounding medium at 20°c are estimated to be 3.2 kj/kg. determine (a) the exit temperature and (b) the total entropy change for this process. solve this problem using constant specific heats.