Daily Quiz 067】Basic Knowledge of Control Systems

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This post was last edited by LZ Gas Station on 2009-11-6 00:30. Please hide your replies; think carefully before posting, as edits are invalid! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP responding to participate, only the first response is valid. All participants receive 2 points as a reward. For the multiple-choice questions in this session, each question is worth 3 points, with an additional 3 points awarded for getting all of them correct. To hide the method, please click here: Hide method. Multiple-choice question: 1. Thermal automatic control devices are mainly composed of (). A. Transmitter B. Regulator C. Actuator 2. The block diagram of a cascade control system includes ( ). A. Two regulators B. Two transmitters C. Two control valves D. Two process variables E. Two setpoints 3. The transmission media in the communication network of a DCS include ( ). A. Twisted pair B. Coaxial cable C. Fiber optic D. Wireless transmission 4. Effective methods to improve the wear resistance of the internal components of control valves include ( ). A. Increasing the size of the valve or its internal components to reduce the flow velocity of the medium B. Using valve internal components made of harder materials C. Modifying the structure of the internal components to divert the impact forces from the medium D. Changing the flow characteristics of the valve E. Altering the direction of flow or the mode of operation of the valve 5. There is a pneumatic valve actuator at the production site, and it shows no output pressure despite having an input signal; the main possible cause for this is ( ). A. Malfunctions such as sticking of the valve internals B. Amplifier failures C. Dirt on the nozzle baffle Reference answers: ABC ABDE ABC ABD BC