[Test Your Knowledge] Chemical Production Knowledge (58) — True or False Questions
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This post was last edited by zfy_80522 on 2010-1-21 01:48. True or False questions: (Answer format: True True True True False) 1. Shortly after a centrifugal pump is started, the vacuum level at the pump’s inlet is normal, and the pressure gauge at the outlet gradually drops to zero; at this point, the centrifugal pump is unable to deliver any water. The possible cause of the failure is a blockage in the suction line ； 2. When a centrifugal pump is operating normally, its head is greater than the lift height ； 3. When compressed gases are flammable and explosive in nature, before starting a reciprocating compressor, nitrogen should be used to completely displace air or other non-working gases from within the cylinders, pipelines, and associated containers, ensuring that the required standards are met and preventing explosions and equipment failures ； 4. Turbine compressors belong to reciprocating compressors ； 5. When a fluid is in motion, the fundamental cause of energy loss is the presence of kinetic energy in the fluid. Answer key: Right, Right, Right, Wrong, Wrong. 4. Turbine compressors belong to the category of centrifugal compressors. 5. When a fluid is in motion, the fundamental cause of energy loss is the viscosity of the fluid. Note: 1) For each correct answer in this activity, 2 wealth points are awarded, with a total score of 10 wealth points. To encourage members to answer questions carefully, those who score full marks and provide explanations for any mistakes made will be rewarded with 1 Charm point. Those who do not hide their answers or do not format them accordingly will, in principle, not be graded. 2) Answers under the same IP are valid only for the first post. Also, please be cautious when posting; edits are invalid (except for replies on the first floor). 3) To achieve the goal of reviewing old material to gain new insights, the answer key is released the following day. Additionally, if you have any objections to the answer key for a certain question, you can post a topic thread for in-depth discussion. 4) Replies to this activity are limited to floor 50 only; replies from floors above 50 will not be considered.
1. Shortly after a centrifugal pump was started, the vacuum level at the pump’s inlet was normal, and the pressure gauge at the outlet gradually dropped to zero; at this point, the centrifugal pump was no longer able to deliver any water. The possible cause of the failure is a blockage in the suction line ； 2. When a centrifugal pump is operating normally, its head is greater than the lift height ； 3. When compressed gases are flammable and explosive in nature, before starting a reciprocating compressor, nitrogen should be used to completely displace air or other non-working gases from within the cylinders, pipelines, and associated containers, ensuring that the required standards are met and preventing explosions and equipment failures ； 4. Turbine compressors belong to reciprocating compressors ； 5. When a fluid is in motion, the fundamental cause of energy loss is the presence of kinetic energy in the fluid. Right, right, wrong, wrong. 4. Turbine compressors belong to the category of centrifugal compressors. 5. When a fluid is in motion, the fundamental cause of energy loss is the viscosity of the fluid.
1. Yes； 2. Wrong ； Less than the lift height 3. Yes ； 4. Wrong ； A turbine compressor is a dynamic compressor with rotating impellers. 5. Wrong ； When a fluid is in motion, the fundamental cause of energy loss is the viscosity present in the fluid
Right, wrong, right, wrong, wrong. 2. When a centrifugal pump is operating normally, its head is greater than the lift height； (Greater than or equal to) 4. Turbine compressors belong to reciprocating compressors ； (Various types) 5. The fundamental reason for energy loss during fluid motion is the viscosity present in the fluid.
Wrong, right, wrong, right, wrong. 1. Shortly after a centrifugal pump is started, the vacuum level at the pump’s inlet is normal, and the pressure gauge at the outlet also gradually drops to zero; at this point, the centrifugal pump is unable to deliver any water. The possible cause of the failure is air leakage in the intake pipeline ； 4. Turbine compressors belong to centrifugal compressors ； 5. When a fluid is in motion, the fundamental cause of energy loss is the viscosity of the fluid.
1. True, cavitation may occur. 2. False, it should be less than. 3. True. 4. True. 5. True