Which of the following shows maximum dip effect (indicating reverse direction of temperature change) ?
Correct answer: D. Mercury thermometer
- A. Thermocouple
- B. Radiation pyrometer
- C. Bimetallic thermometer
- D. Mercury thermometer
Explanation
A mercury thermometer can show a pronounced dip or reversal in indication because mercury and the glass bulb respond with different thermal lags. Radiation pyrometers have no comparable liquid-column effect, while the other choices are less associated with this stated dip effect.
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