【Daily Question】Test Issue 20150928
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This post was last edited by hjztbwg on 2015-9-30 17:26. Reward for participation: 2 wealth points. Reward for correct answer: 9 Wealth. When using variable-frequency fans, which of the following specifications should be followed for their selection? The answers are BC. (A) The pressure of the fan should be increased by 10~15% based on the calculated pressure loss in the system. (B) The pressure of the fan is taken as its rated pressure, which corresponds to the total calculated pressure loss in the system. (C) The power of the fan’s motor should be increased by 15~20% compared to the calculated value. (D) The power of the fan’s motor should be decreased by 15~20% compared to the calculated value
For variable-frequency fans A and C, the maximum pressure and motor power should be higher, right?
B, C,-----------------------------------
For option A, I’m not quite sure~~~~~~~~~~~~~~~~
When using variable-frequency fans, which of the following specifications should be followed for selection? (B, C)
C........................
AC. :victory::victory::victory::victory:
B) The pressure of the fan is taken as the rated wind pressure based on the total pressure loss calculated for the system. C) The power of the fan motor should be 15~20% higher than the calculated value
When using variable-frequency fans, which of the following specifications should be followed for selection? (AB) (A) The pressure of the fan should be 10~15% higher than the pressure loss calculated for the system. (B) The pressure of the fan shall take the total pressure loss calculated for the system as its rated pressure. (C) The power of the fan motor should be 15~20% higher than the calculated value. (D) The power of the fan motor should be 15~20% lower than the calculated value
When using variable-frequency fans, the selection should comply with which of the following regulations (B)?