36. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.
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37. Select the correct statement from the following.
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38. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
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39. A mercury thermometer can not be used to measure the temperature below the freezing point of mercury, which is __________ °C.
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40. The thermal emf-temperature relationship of most thermocouples is
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41. Which of the following thermocouple materials does not contain nickel?
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42. Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature
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