One Question per Day on Synthetic Ammonia (Series 25)

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This post was last edited by penghh1985 on 2016-3-10 17:21. Multiple-choice question (fill in the correct option in the brackets). Continuing from series 24: 121. (B-B-007) The fouling coefficient of natural gas is ( ) W/m2K. (A) 5,800 (B) 6,000 (C) 5,500 (D) 5,000 122. (B-B-008) In a tube heat exchanger, where cold and hot water exchange heat, the overall heat transfer coefficient is ( ) W/m2K. (A) 580～1,700 (B) 850～1,200 (C) 1,200～1,700 (D) 1,400～1,700 123. (B-B-008) In a shell-and-tube heat exchanger, when heat is transferred from condensed steam to water, the overall heat transfer coefficient is ( ) W/m2℃. (A) 1,000–2,000 (B) 1,000–1,500 (C) 700–1,500 (D) 1,500–2,000 124. (B-B-008) In a shell and tube heat exchanger, when heat transfer occurs between gases, the overall heat transfer coefficient is ( ) kilocalories per m2·hour·°C. (A) 10～30 (B) 20～40 (C) 30～50 (D) 40～60 125. (B-B-009) The comparison of the degree of gas dissolution in water is as follows ( ). (A) SO2＞NH3＞CO2 (B) NH3＞SO2＞CO2 (C) CO2＞NH3＞SO2 (D) CO2＞SO2＞NH3 Answer: AACAB Scoring criteria: 3 points for participation, 8 points for a completely correct answer.