CEM Concepts and Principles 5

Question 1

What does a 'load factor' of 50% on an electrical account indicate?

Accepted Answer

Average demand is 50% of peak demand over the billing period

Answer

Load factor is the ratio of average demand to peak demand; 50% means the facility used half of its peak capacity on average, indicating significant demand variability.

Question 2

Which of the following best describes 'energy benchmarking'?

Accepted Answer

Comparing a facility's energy performance against similar buildings or historical data

Answer

Benchmarking compares a facility's energy use intensity against peers or its own historical baseline to identify performance gaps and prioritize improvement efforts.

Question 3

In an energy balance, what does the term 'unaccounted-for energy' represent?

Accepted Answer

The difference between metered input energy and the sum of measured end uses

Answer

Unaccounted-for energy is the gap between total metered input and the sum of all identified uses, often revealing losses due to leaks, theft, or metering errors.

Question 4

What is the primary advantage of using 'interval meter data' (15-minute intervals) over monthly utility bills for energy analysis?

Accepted Answer

It reveals load profiles and demand patterns not visible in monthly totals

Answer

Interval data shows granular time-of-use patterns—peaks, valleys, and anomalies—enabling targeted demand management and operational optimization impossible with monthly data.

Question 5

The 'coefficient of performance' (COP) of a heat pump describes:

Accepted Answer

The ratio of useful heat delivered to the energy input required

Answer

COP is the ratio of useful thermal energy output to the electrical energy input; a COP of 3 means 3 units of heat are delivered for every 1 unit of electricity consumed.

(CEM) Certified Emergency Manager Practice Test

(CEM) Certified Emergency Manager Practice Test

CEM Concepts and Principles 5