A gauge in a hydronic system reads 12 psi. What is the equivalent head pressure in feet of water? ...

A gauge in a hydronic system reads 12 psi. What is the equivalent head pressure in feet of water?
 
  a. 27.7 feet
  b. 5.2 feet
  c. 51.6 feet
  d. 48 feet

---

[Ques. 2] A given weight of water can carry more heat than the same weight of air because _____.
 
  a. water is heavier than air
  b. water has a greater specific heat
  c. air has a greater pressure drop
  d. water has less friction within piping

---

[Ques. 3] The type of valve that reduces the risk of scalding by mixing the water coming from the hot water heater to a
  preset temperature before it is delivered to the faucet is a _____.
 
  a. ball valve
  b. line-check valve
  c. tempering valve
  d. temperature and pressure relief valve

---

[Ques. 4] The _____ should be installed so that it bypasses the water softener
 
  a. water heater
  b. hose bibb
  c. hot water supply
  d. cold water supply

---

[Ques. 5] The type of valve used in piping systems with extremely low backpressure is a _____.
 
  a. swing-check value
  b. ball-check value
  c. lift-check value
  d. gate-check