Certified Energy Auditor Certification Certified Energy Auditor Steam Systems and Process Energy Questions and Answers

Question 1

What is the approximate latent heat of vaporization of steam at 212°F (100°C) at atmospheric pressure?

Accepted Answer

970 BTU/lb

Answer

1,150 BTU/lb

Answer

540 BTU/lb

Answer

800 BTU/lb

Question 2

Which type of steam trap is best suited for high-pressure applications and provides continuous condensate drainage?

Accepted Answer

Thermodynamic (disc) trap

Answer

Float and thermostatic trap

Answer

Inverted bucket trap

Answer

Bimetallic trap

Question 3

In a steam distribution system, what percentage of energy input is typically lost through failed-open steam traps?

Accepted Answer

15–25%

Answer

1–3%

Answer

50–60%

Answer

5–8%

Question 4

What does a steam flash tank recover in a condensate return system?

Accepted Answer

Low-pressure flash steam from high-pressure condensate

Answer

Superheat from steam headers

Answer

Blowdown heat from boilers

Answer

Latent heat from exhaust gases

Question 5

Which metric is commonly used to express boiler efficiency as measured by the flue gas method?

Accepted Answer

Combustion efficiency (stack loss method)

Answer

Thermal efficiency

Answer

Fuel utilization efficiency

Answer

Carnot efficiency

Question 6

What is the primary energy-saving opportunity identified when boiler blowdown heat recovery is implemented?

Accepted Answer

Recovering heat from blowdown water to preheat makeup water

Answer

Reducing feedwater chemical usage

Answer

Lowering stack gas temperature

Answer

Improving combustion air mixing