【Daily Quiz 134】Basic Knowledge of Control Systems (Please hide the post)

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This post was last edited by LZ Gas Station on 2010-1-28 08:14. Multiple-choice question: 1. The flow velocity measured by a differential pressure flow meter is (). A. Average flow velocity across the pipe cross-section B. Average flow velocity at diameter D C. Local flow velocity 2. What can be used for the connection joint in the middle of the compensation wire? A. Welding B. Crimping C. Can be welded or crimped. 3. （） is suitable for control valves with large pressure differences, as it helps to reduce noise. A. Two-seater B. Single-seater C. Sleeve 4. When the output signal for proportional control is 100%, what should be the opening degree of the two control valves being regulated? A. Each one is turned on or off to half capacity. B. One unit is turned completely off or on, while the other is turned on (or off) to half capacity. C. Both units are turned either completely on or completely off; either one is turned on while the other is turned completely off. 5. The quality inspection items for the individual calibration of alarm devices include ( ) A. Alarm test, silencing test, reset test, calibration records. B. Alarm check, silencing check, reset check, wiring check. C. Calibration records. True or False: 6. To reduce costs, it is not necessary to have redundant sensors in a level 2 safety interlock system. 7. The density of a gas decreases as pressure increases. 8. The stroke of the valve stem is proportional to the magnitude of the output signal from the valve positioner. 9. The two positions of a two-position three-way solenoid valve refer to the two inlet and outlet ports, while three-way means that it has a spool with three positions. 10. Gate valves can be used as primary pressure-taking valves. Answer key: BBCCA FFFFT