What is the purpose of a differential enthalpy sensor?
What will be an ideal response?
This is used for the economizer section. The airstream with the lowest enthalpy will be directed by dampers through the economizer section.
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If air vents are not present or are inoperable on the mains, what are the possible ramifications?
What will be an ideal response?
The victorious World War II Allies quickly agreed that
A. Germany should pay economically crippling war reparations. B. Nazism should be destroyed in Germany and high-ranking Nazis should be tried and punished for war crimes. C. occupied Germany should be reunited as soon as possible. D. Germany should receive massive economic aid. E. Germany should be divided into two nations, East and West Germany.
Answer the following statement(s) true (T) or false (F)
1. Engineers having knowledge of any alleged violation of this Code, following a period of thirty days during which the violation is not corrected, shall report thereon to appropriate professional bodies and, when relevant, also to public authorities, and cooperate with the proper authorities in furnishing such information or assistance as may be required. 2. Engineers shall undertake assignments only when qualified by education or experience in the specific technical fields involved 3. Engineers shall not affix their signatures to plans or documents dealing with subject matter in which they lack competence, but may affix their signatures to plans or documents not prepared under their direction and control where the engineer has a good faith belief that such plans or documents were competently prepared by another designated party. 4. Engineers may accept assignments and assume responsibility for coordination of an entire project and shall sign and seal the engineering documents for the entire project, including each technical segment of the plans and documents. 5. Engineers shall strive to be objective and truthful in professional reports, statements or testimony, with primary consideration for the best interests of the engineer's client or employer. The engineer's reports shall include all relevant and pertinent information in such reports, statements or testimony, which shall bear the date on which the engineer was retained by the client to prepare the reports.
The ac bridge circuit of Fig. 9.85 is called a Wien bridge. It is used for measuring the frequency of a source. Show that when the bridge is balanced,
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