The four categories of gas-fired furnaces are based on: A) ...

[jon_i]

The four categories of gas-fired furnaces are based on:
 
  A) Efficiency. B) Flue gas temperature and pressure.
  C) Firing rate. D) Category of gas being burned.

Question 2

What is the advantage of using multiple compressors on a supermarket rack system?
 
  A) System capacity can match refrigeration loads, which vary over a wide range.
  B) Extra compressors provide backup in case one quits working.
  C) Using multiple parallel compressors makes the use of multiple refrigerants possible.
  D) The compressors can operate at a higher compression ratio as a parallel group.

[kxciann]

Answer to Question 1

B

Answer to Question 2

A

[jon_i]

Excellent

[Alyson.hiatt@yahoo.com]

Gracias!