In a refinery, hot flue gasses at 1800°c are cooled by a fluid at 25°c with the gas and liquid side heat transfer coefficients being 50 and 500 w/m2-k, respectively. the wall that separates the gas and liquid side is composed of stainless steel and has a thickness 1cm. assuming no contact resistances, determine: a)- the rate of heat losses per unit area from the gas to the liquid. b)- will the wall melt on the gas side? the solidus temperature of the stainless steel is 1400°c data for stainless steel: k-25 w/m. k

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

Which of the following is the most important advantage of a large field of view? a. allows larger areas to be examined b. relieves eyestrain c. minimizes parallax errors. d. increases precision in proportion to the in- crease in field of view

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference