【Daily Question】Question from Issue 20150930
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Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. Which of the following statements is correct regarding the airtightness and strength tests of the air ducts for air supply in air conditioners? ( ) (A). The airtightness test of air ducts can be carried out on the already installed air duct system. (B). Two connected sections taken from the fabricated air ducts are selected for testing. (C). The allowable air leakage rate for circular metal air ducts is 80% of the value specified for rectangular air ducts. (D) The strength test of air ducts should be conducted after the airtightness test has been passed. [Production and Management Division] Seeking moderators and technical discussants to join us
Which of the following statements is correct regarding the airtightness and strength tests of the air ducts for air supply in air conditioners? (D) (A). The airtightness test of air ducts can be carried out on the already installed air duct system. (B) Two connected sections taken from the fabricated air ducts are selected for testing. (C) The allowable air leakage rate for circular metal air ducts is 80% of the value specified for rectangular air ducts. (D) The strength test of air ducts should be conducted after the airtightness test has been passed
The answer should be: (D). The strength test of air ducts should be conducted after the airtightness test of those ducts has been passed, in accordance with clause 15.1.1 of the ‘Heating Installation’ standards. Before mass production of air ducts, tests for their strength and airtightness must be carried out. A is incorrect; according to clause 15.2.1, B is incorrect; clause 15.2.3 means C is incorrect; clause 15.2.4 means D is correct
Which of the following statements is correct regarding the airtightness and strength tests of the air ducts for air supply in air conditioners? (D) The strength test of the air ducts should be conducted after the airtightness test of those ducts has been passed
Which of the following statements is correct regarding the airtightness and strength tests of the air ducts for air supply in air conditioners? (A) The airtightness test of air ducts can be conducted on the already installed air duct system. (B) Two connected sections taken from the fabricated air ducts are selected for testing. (C) The allowable air leakage rate for circular metal air ducts is 80% of the value specified for rectangular air ducts. (D) The strength test of air ducts should be carried out after the airtightness test has been passed. Answer: D. According to clause 15.1.1 of the “Heating Installation” standards, strength and airtightness tests must be conducted on air ducts before they are manufactured in bulk. A Error ； Article 15.2.1 stipulates that B is incorrect ； 15.2.3 Clause C is incorrect ； Clause 15.2.4 D is correct.
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Which of the following statements is correct regarding the airtightness and strength tests of the air ducts for air supply in air conditioners? (D) (A). The airtightness test of air ducts can be carried out on the already installed air duct system. (B) Two connected sections taken from the fabricated air ducts are selected for testing. (C) The allowable air leakage rate for circular metal air ducts is 80% of the value specified for rectangular air ducts. (D) The strength test of air ducts should be conducted after the airtightness test has been passed
(D) The strength test of the air ducts should be carried out after the airtightness test of the ducts has been passed