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Better Temperature Measurements


Quiz Questions

1. The following Voltage -Temperature graph represents which of the following device?

Better Temperature Measurements 1
RTD
Thermocouple
Thermistor
I.C.Sensor
2. ___________ law states that a third metal inserted between the two dissimilar metals of a thermocouple junction will have no effect upon the output voltage as long as the two junctions formed by the additional metal are at the same temperature.
Law of three metals
Law of intermediate metals
Law of dissimilar metals
None of the above
3. In the following figure, what does E,K,J,R,S represents?

Better Temperature Measurements 2
Thermometer
RTD
Thermocouple
Sensors
4. __________is an A/D technique which essentially averages noise over a full line cycle; thus, power line related noise and its harmonics are virtually eliminated.
Integration
Guarding
Tree switching
None of the above
5. Most measurement errors may be traced to which of the following primary sources?
Poor junction connection
Noise and leakage currents
Shunt impedance and galvanic action
All of the above
6. All metals produce a positive change in resistance for a positive change in temperature. This, of course, is the main function of an _____________.
Thermocouple
Thermistor
RTD
None of the above
7. Decalibration describes the process of unintentionally altering the physical makeup of the thermocouple wire so that it no longer conforms to the NBS polynomial within specified limits.
True
False
8. Which of the following figures represent a wheat stone bridge?
Better Temperature Measurements 3
Better Temperature Measurements 4
Better Temperature Measurements 5
None of the above
9. The one disadvantage of using 4-wire ohms is that we need one more extension wire than the 3-wire bridge.
True
False
10. In the following equation , the temperature coefficient is represented by?

Better Temperature Measurements 6
α
δ
β
None of the above