Micah is the chemist for a large cleaning solution manufacturer. Micah works hard on formulas that most employees in the company do not understand. When a co-worker emails Micah with a question, Micah replies in all capital letters because, in his opinion, it communicates that his response is important. What issue might arise from Micah’s email replies? a. Micah’s emails might be returned to him undelivered.

b. Micah’s emails might be lost in the company’s email system.

c. Micah’s co-workers might think that Micah is yelling at them.

d. Micah’s emails might get sent to another company.

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

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?

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0