What is the deal with the term "preheat?"?

What is the deal with the term "preheat?"?
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1 Answer

Answer :

Pre-heating the oven before you start cooking.
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The amount of combustible escaping unconsumed from the furnace, depends upon the (A) Air supplied and furnace temperature (B) Burner design (thoroughness of mixing versus stratification) (C) Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction) (D) All (A), (B) and (C)

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The main function of primary air in pulverised coal fired burner is to (A) Burn CO to CO2 (B) Dry and transport the coal (C) Have proper combustion by supplying it around the burner (D) Preheat the tertiary air used for complete combustion of CO to CO2

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During root welding, which of the following would be the main cause of excess penetration? a) The root gap is too small in accordance with WPS b) Preheat not used c) The current is too high d) Root face is too large

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When would you measure the minimum preheat temperature? a) On completion of each pass b) Immediately prior to commencing the first pass and subsequent passes c) When the welding is complete d) Minimum preheat temperature measurement is only required if the heat input is lower than that specified in WPS

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Why it is sometimes necessary to preheat the base material before welding? a) To remove oil and grease b) To remove moisture from inside the material c) To prevent the possible risk of cracking d) Not required if using cellulosic electrodes as these will provide enough heat

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Last Answer : b) The fabrication specification/WPS will give the requirements

When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

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