中石北京 安全检测与监测 第一阶段在线作业（China stone Beijing safety inspection and monitoring of the first phase of online operation）.docVIP

中石北京 安全检测与监测 第一阶段在线作业（China stone Beijing safety inspection and monitoring of the first phase of online operation） Assignment The first item does not belong to the photoelectric element in the following components Your answer: A Subject score: 0.5 Score: 0.5 Annotation: fiber is a light transmitting tool Second questions: the following methods can not change the capacitance of inductance type sensors Your answer: B Subject score: 0.5 Score: 0.5 Annotation: inductance sensor principle is to use inductance component to change the measured physical quantity into inductance or mutual inductance coefficient, and then convert it into voltage (or current change) by measuring circuit Third piezoelectric sensors are currently used for measurement Your answer: A Subject score: 0.5 Score: 0.5 Annotation: piezoelectric sensors are sensitive components, which are used for force, pressure, acceleration, mechanical shock and vibration, etc. Fourth, the Holzer component uses constant current source excitation for the purpose of Your answer: C Subject score: 0.5 Score: 0.5 Annotation: constant current source excitation reduces the equipotential potential Fifth title photosensitive diode belongs to Your answer: C Subject score: 0.5 Score: 0.5 Annotation: use light voltaic effect, can make photosensitive diode, photosensitive transistor and photocell Sixth questions photoelectric vacuum tube belongs to Your answer: A Subject score: 0.5 Score: 0.5 Annotation: devices made with an external photoelectric effect include a vacuum tube, an inflator, and a photomultiplier tube Seventh, temperature rise, photosensitive resistor, photosensitive diode, phototransistor dark current Your answer: A Subject score: 0.5 Score: 0.5 Note: rise in temperature, increase in dark current, decrease in bright current, decrease in signal to noise ratio The eighth title magnetoresistive ratio reflects the maximum signal strength obtained by magnetoresistive sensors. Generally, the magnetoresistive ratio of ani