The resistance temperature characteristics of a temperature transducer is show in the figure below,
The transducer in question is which of the following? A) Nickel RTD B) NTC thermistor C) Platinum RTD D) PTC thermistor
Note this question is from the 2000 GATE question paper on the Instrumentation subject.
My attempt at a solution
It does not look like Nickel or Platinum RTD,
Can't be NTC since the slope is positive.
I thought it must be the PTC since it has a "critical temperature" after which Resistance shoots up, but switching PTC thermistors have a slightly negative temperature coefficient up to the point of minimum resistance. While the graph shows a positive slope until the "jump off" temperature.