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A thermocouple thermometer is connected to a millivoltmet...

A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0°C and the other is steam at 100°C, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure

A.

100oC

B.

248oC

C.

250oC

D.

350oC

Correct answer is C

tθ - to = 10,
t100 - to = 4

θ = tθ - to
t100 - to
× 100

 

10
4
× 100 = 250°C