FREE Certified Energy Auditor Certification Trivia Questions and Answers

Question 1

The phrase "lumens per watt" refers to lighting efficiency.

Accepted Answer

True

Answer

'Lumens per watt' (lm/W) is indeed the standard metric for measuring lighting efficiency, also known as luminous efficacy. It quantifies how much visible light (lumens) a light source produces for each unit of electrical power (watt) it consumes. A higher lumens per watt value indicates a more energy-efficient light source.

Question 2

The full load rating of a chiller is 0.7 kW/ton. Given that this unit has a 200 ton rating, what is the full load kW?

Accepted Answer

140

Answer

The full load kW of a chiller is calculated by multiplying its cooling capacity in tons by its full load rating in kW per ton. In this scenario, a 200-ton chiller with a rating of 0.7 kW/ton requires 0.7 kW/ton * 200 tons = 140 kW. This calculation directly yields the total electrical power consumed when the chiller operates at its maximum capacity.

Question 3

Ground source heat pumps may not achieve predicted levels of efficiency because of

Accepted Answer

Improperly installed ground loop

Answer

Ground source heat pumps rely on the efficient transfer of heat with the earth through a buried ground loop. If this ground loop is improperly installed—for example, if it's too short, incorrectly spaced, or poorly backfilled—it can significantly impede heat exchange. This reduced thermal conductivity directly compromises the system's ability to operate at its predicted efficiency levels, leading to underperformance.

Question 4

The minimal requirements are specified in ASHRAE standard 62-2010 for:

Accepted Answer

Acceptable indoor air quality levels

Answer

ASHRAE Standard 62.1, titled "Ventilation for Acceptable Indoor Air Quality," specifically outlines the minimum ventilation rates and other provisions for commercial and institutional buildings. Its primary purpose is to ensure indoor air quality that is acceptable to human occupants and minimizes adverse health effects. The standard does not primarily address motor efficiencies, HVAC equipment sizing, or chiller efficiencies, which are covered by other ASHRAE standards.

Question 5

There are 50 employees working in an office building, which is occupied 250 days a year. Each employee is thought to use an average of 1 gallon of hot water per day for hand washing. City water is 60°F while the required hot water temperature is 120°F. Determine the annual energy consumption for heating this water:

Accepted Answer

6.25 MMBtus

Answer

To calculate the annual energy consumption, first determine the total annual hot water usage: 50 employees * 1 gallon/day/employee * 250 days/year = 12,500 gallons/year. Using the specific heat of water (8.34 lbs/gallon * 1 Btu/lb°F) and the temperature difference (120°F - 60°F = 60°F), the energy required is 12,500 gallons * 8.34 lbs/gallon * 1 Btu/lb°F * 60°F = 6,255,000 Btu. Converting this to MMBtus (million BTUs) gives approximately 6.25 MMBtus.

Certified Energy Auditor Certification Practice Test

Certified Energy Auditor Certification Practice Test

FREE Certified Energy Auditor Certification Trivia Questions and Answers