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Superconductors use ____ to maintain working temperature near _____

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Superconductors use ____ to maintain working temperature near _____

(a) heat sinks, 70K

(b) open cooling system, 80K

(c) forced air, 75K

(d) closed cooling system, 70K

This question was posed to me by my school principal while I was bunking the class.

The above asked question is from RF and IF Processing Tradeoffs in division Technology Tradeoffs in Software Defined Radio of Cognitive Radio

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The correct option is (d) closed cooling system, 70K

Explanation: Superconductor analog filters make use of closed cooling system, and thermo-electric coolers to maintain working temperature near 70K.

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