Questions on Knowledge (Technology) in Petrochemical and Natural Gas Chemical Engineering, April 4, 2010

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This post was last edited by lijianhuai on 2012-5-18 at 10:58. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the petrochemical technology exchange area! At the same time, I hope other moderators will also participate in this activity, taking turns to come up with questions and discuss various sets of devices! Let’s work together to promote the development of the petrochemical technology exchange zone! The maximum score for this activity is 20 Wealth points. Friendly votes and repeated votes are not allowed; please be careful when posting, as such posts will not be counted as valid scores! To prevent the answers of some members from affecting others, members are asked to hide their own posts while answering questions. Thank you for your cooperation. For specific methods of hiding, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Multiple-choice questions: 1. Water hardness is a measure of the ( ) dissolved in water. A. Sodium and magnesium ions B. Calcium and magnesium ions C. Iron and calcium ions 2. The heat transfer process between the hot fluid and the wall surface in a heat exchanger belongs to ( ). A. Heat conduction B. Heat convection C. Heat radiation D. Natural conduction 3. The main cause of fluid resistance is ( ). A. The fluid flows too slowly B. The fluid flows too fast C. The internal friction of the fluid and its flow state Answers: 1B 2B 3C