The following is a list of metals and alloys: plain carbon steel magnesiumbrass zincgray cast iron tool steelplatinum aluminumstainless steel tungstentitanium alloy select from this list the one metal or alloy that is best suited for each of the following applications, and cite at least one reason for your choice: a) the block of an internal combustion engine. b) condensing heat exchanger for steam. c) jet engine turbofan blades. d) drill bit. e) cryogenic (i. e. very low temperature) container. f) as a pyrotechnic (i. e. in flares and fireworks).g) high-temperature furnace elements to be used in oxidizing atmospheres

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?