Question

5. A thermocouple circuit uses Chrome - Alumel which gives an e.m.f of 33.3
mV when measuring a temperature of 800 oC with reference temperature
of 0 oC. The resistance of the metal coil is Rm = 50 Ω and current of 0.1
mA gives a full-scale deflection. The resistance of the junction and leads
Re = 12 Ω. Determine,
i. Resistance of the series resistance if a temperature of 800 oC is to
give full scale deflection
ii. The approximate error due to rise of 1Ω in Re
iii. The approximate error due to rise of 10 oC in a copper coil of the
meter. The resistance temperature coefficient of the coil is 0.00426
/oC

Answer 1

Answer:

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Explanation:

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