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Pick up false statement: | |
A. | copper-constantan thermocouple is a stable couple resistant to both oxidis¬ing and reducing atmosphere, but needs protection from acidic vapours [Wrong Answer] |
B. | Iron-constantan thermocouple suffers from oxidation attack on iron wire, if exposed [Wrong Answer] |
C. | iron-constantant couple can be made stable by using enamelled iron [Wrong Answer] |
D. | Both wires of chromel-alumel ther-mocouples are prone to damage by sulphurous gases [Wrong Answer] |
E. | copper-constantan thermocouple is used as a reference standard for calibration purposes. [Correct Answer] |