【Daily Quiz 105】Basic Knowledge of Control Systems

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This post was last edited by LZ Gas Station on 2009-12-30 07:39. Multiple-choice question: 1. A normally closed contact is a contact that is in ( ) state when the button is not pressed. A. Closed B. Open C. Intermediate position D. Any position 2. The most basic requirement for switching between manual/automatic mode during control is (). A. Manual/automatic modes can track each other. B. No disturbance. C. The amount of disturbance during switching must be within specified limits. D. It depends on the operating conditions at that time. 3. The accuracy class of an instrument is indicated by (). A Systematic error B Absolute error C Allowable error D Random error 4. Which of the following situations does not constitute an operation of thermal protection? A. MFT B. Tripping due to high turbine vibration C. Operation of the condenser protection system D. Tripping of the generator outlet circuit breaker 5. The pressure reading shown at industrial sites represents the gauge pressure of the parameter being measured; therefore, the inner wall at the connection point between the pressure tapping tube and the pipeline should be (). A. Align horizontally B. Insert inside it C. Insert inside it and bend in the direction of the medium’s flow D. Insert inside it and in the opposite direction to the medium’s flow True or False: 6. A multimeter can measure resistance while the circuit is still powered. 7. When calibrating a pressure gauge, you can gently tap the gauge case with your hand. 8. Pressure measurement of oxygen must be carried out using a dedicated pressure gauge; for the pressure measurement of other gases, ordinary pressure gauges can be used. 9. Using a mass flow meter to measure the flow rate of a medium does not require the addition of additional temperature and pressure compensation devices. 10. The residual error in the proportional control process is proportional to the proportionality gain of the controller. Answer: ABCDA TTFTT