Which one of the following is a list of devices from least efficient to most efficient

a. light-bulb, automobile engine, power plant, electric motor
b. home oil furnace, light bulb, electric motor, automobile
c. power plant (thermal), automobile engine, light-bulb (fluorescent), light-bulb (incandescent)
d. power plant (thermal), automobile engine, light-bulb (incandescent), light-bulb(fluorescent)

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.