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| Q. |
Which of the following principle is used to produce low-temperatures'? |
| A. | Super conductivity |
| B. | Joule-Kelvin effect |
| C. | Thermo-electric effect |
| D. | Adiabatic demagnetization |
| Answer» D. Adiabatic demagnetization | |
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Explanation: Magnetic refrigeration is a cooling technology based on the magneto- caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto- caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field. |
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