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Author Question: What would the mixed air temperature be for a system with 20 outdoor air if the outdoor temperature ... (Read 80 times)

Shelles

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on: Jul 24, 2018
What would the mixed air temperature be for a system with 20 outdoor air if the outdoor temperature is 90F and the return air temperature is 80F?
 
  A) 0.8  90F =18F; 18F + 80F = 98F mixed air temperature
  B) (90F + 80F)  0.4 = 68F
  C) 0.2  90F =18F; 0.8  80F = 64F; 18F + 64F = 82F mixed air temperature
  D) (90F + 80F)/2 = 85F mixed air temperature

Question 2

Hot Surface Ignition System (HSI) controls lockout after how many unsuccessful attempts?
 
  A) Two attempts B) The controls do not lock out.
  C) Three or more attempts D) One attempt


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ririgirl15

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Reply #1 on: Jul 24, 2018
Answer to Question 1

C

Answer to Question 2

C


Shelles

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

Viet Thy

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Reply 3 on: Yesterday
Wow, this really help

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