Q5 (1) Explain with neat sketch the working principles of resistance temperature detector (RTD), thermistor and thermocouple.

(2) Consider 5 chromel-alumel thermocouples that are connected in series The five junctions are at 50, 100, 150, 200 and 250 C. The series arrangement is hooked to a potentiometer, the copper-binding posts of which are at 30 C. what voltage will be indicated by the potentiometer?