Question

Which of the following temperature sensors is not used for a temperature measurement?

(a) Non-electrical type

(b) Electrical type

(c) Magnetic type

(d) Radiation type

I have been asked this question in unit test.

My question is based upon Instrumentation and Control in section Instrumentation and Control of Fermentation Technology

Answer 1

Correct option is (c) Magnetic type

For explanation: There is no such magnetic type used for the measurement of temperature in the fermentation. The non-electrical type, electric type, radiation types are usually used to measure temperature in fermenters.