For an instrument, the ratio of maximum deviation to full scale is called as A.

Question

For an instrument, the ratio of maximum deviation to full scale is called as A. Linearity B. Static sensitivity C. Dynamic deviation D. Precision Which is true about thermocouple temperature sensor? _____ A. A thermocouple temperature sensor does not require a reference temperature B. The tip of a thermocouple temperature sensor is a junction of two different types of material C. Thermocouple temperature sensor requires an external voltage source D. Thermocouple temperature sensor only responses to high frequency temperature change. Which is the possible principle to build a displacement sensor? _________ A. Thermistor B. Piezoelectric principle C. Pyroelectric principle D. Thermocouple principle Which statement below is not true? _________ A. There are two types of electrodes: polarizable and nonpolarizable electrodes B. Perfectly polarizable electrode has actual charges crossing the electrode-electrolyte interface when current is applied. It behaves as though it were a capacitor C. Perfectly nonpolarizable electrode has charges freely passing across the electrode-electrolyte interface. D. Electrodes are actually transducers that convert between ionic current in the body to electronic current in the wire

Explanation / Answer

1) Linearity. You can find the respective deifinitons below.

Linearity - A position measuring instrument’s Linearity is a measurement of the deviation between a transducer’s output to the actual displacement being measured.

Static Sensitivity - The sensitivity of an instrument refers to its ability to detect changes in the measured quantity. It can be defined as the slope of the calibration curve if the input/output relationship is linear.

Dynamic Deviation : The total dynamic deviation is the maximal difference between the observed values of general acceleration in the area of the gear's pitch.

Precision - The precision of a measuring instrument is the degree to which it produces similar results for the same inputs on a number of occasions.

2) Option A is false because we do have a reference junction temperature in thermocouple temperature sensor.

Option B is TRUE because an electric current flows in a closed circuit of two dissimilar metals if their two junctions are at different temperatures. This is the basic principle in making thermocouples. So we use two different metals in tip of thermocouple.

Option C is false because we dont need any external voltage source in thermocouple temperature sensor as a thermal voltage is produced in the thermocouple because of the temperature difference.

Option D is false beacuse we have different types of thermocouple temperature sensors working on a wide range of temperatures from low frequency temperature changes to high frequency temperature changes.

3)It works on Piezoelectric principle . Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress.

4) Option B is not trues beacuse there won't be any actual charge crossing in the electrode - electrolyte interface. Thus it acts as a capacitor. But with no charge cross.

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