An engineer has designed transmission equipment to transmit 7200 symbols per second while encoding 8 bits per symbol. if the signal to noise ratio is 400: 1 and the channel bandwidth is 3625 hz, has the engineer's design exceeded theoretical limits?

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?