In a forced hot-water heating system, the thermal circulation of ...

[bobthebuilder]

In a forced hot-water heating system, the thermal circulation of water is prevented by _____.
 
  a. using small diameter water return lines
  b. using large diameter water return lines
  c. isolating the circulating pump
  d. placing a check valve in the water return line

Question 2

In a given length of pipe, if the flow rate in gallons per minute (gpm) is doubled, pressure drop _____.
 
  a. stays the same
  b. doubles
  c. quadruples
  d. increases slightly

[stallen]

Answer to Question 1

d

Answer to Question 2

c