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  Tiempo Restante


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Sodium chloride","questionTimeSeconds":"0","questionTimeMinutes":"2","questionImagePath":null,"position":null,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":407244,"quiz_id":"20575","answer_id":null,"answerType_id":"0","created_at":"2018-03-12 23:26:12","updated_at":"2018-03-12 23:26:12","questionName":"Operating temperatures below _____ of a hot water boiler are often avoided to prevent flue gas condensation.","questionTimeSeconds":"0","questionTimeMinutes":"2","questionImagePath":null,"position":null,"explanation":"","question_score_id":null,"lang":null,"questionAudioPath":null},{"id":407222,"quiz_id":"20575","answer_id":null,"answerType_id":"0","created_at":"2018-03-12 22:19:56","updated_at":"2018-03-12 22:19:56","questionName":"The most commonly used flame detection devices are: 1. Ultraviolet detectors 2. Thermocouples 3. Flame rods 4. Infrared detectors 5. 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The wax filled sensor probe in a combination pressure-temperature relief valve will expand and open the valve by means of a piston at approximately:

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