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Author Question: Compared to blue flames, yellow flames: A) Burn at a lower temperature. B) Burn more cleanly. C) ... (Read 83 times)

debasdf

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on: Jul 27, 2018
Compared to blue flames, yellow flames:
 
  A) Burn at a lower temperature. B) Burn more cleanly.
  C) Produce about the same amount of heat. D) Burn at a higher temperature.

Question 2

How many wires are needed for a communicating control system to control a three-stage heat, two-stage cool heat pump?
 
  A) Nine wiresone for each stage plus reversing valve and power
  B) Five wiresone for each stage heat and cool
  C) Four wirestwo for power and two for communication
  D) No wires are required because communicating systems are wireless.


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fdliggud

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Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

C


debasdf

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

smrtceo

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Reply 3 on: Yesterday
:D TYSM

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