Free Certified Energy Manager Audit & Billing Questions and Answers

Question 1

Kilowatts are a unit of measurement for energy consumption, whereas kilowatt-hours are a unit of measurement for power consumption.

Accepted Answer

FALSE

Answer

This statement is false. Kilowatts (kW) are a unit of power, which measures the rate at which energy is consumed or produced at any given moment. Kilowatt-hours (kWh) are a unit of energy, representing the total amount of energy consumed over a period of time (power multiplied by time). Therefore, the definitions in the statement are reversed.

Question 2

How many steam traps have failed in your steam system may be ascertained using a flue gas analyzer.

Accepted Answer

False

Answer

This statement is false. A flue gas analyzer is used to measure the composition of combustion gases (e.g., oxygen, carbon monoxide, nitrogen oxides) exiting a boiler or furnace to assess combustion efficiency and emissions. It cannot detect failed steam traps, which are components in a steam distribution system. Failed steam traps are typically identified using methods like ultrasonic detection, infrared thermography, or visual inspection for temperature differences.

Question 3

Which device may be used to spot uninsulated steam lines:

Accepted Answer

Infrared Camera

Answer

An infrared camera, also known as a thermal imager, detects and visualizes heat radiation. Uninsulated steam lines will emit significantly more heat than their surroundings, appearing as distinct hot spots in a thermal image. This allows for quick and non-invasive identification of areas with excessive heat loss, making it an ideal tool for energy audits and maintenance checks.

Question 4

How much more will you pay (for the following 11 months) if you had a 700kW additional spike (beyond usual demand) during the previous month if you pay $10 per kW per month and have an 80% demand ratchet?

Accepted Answer

$61,600 per year

Answer

A demand ratchet means that a percentage of the highest demand spike in a billing period will be charged for subsequent months. The additional spike was 700 kW. With an 80% demand ratchet, the additional demand charged is 0.80 * 700 kW = 560 kW. This charge applies for the following 11 months. So, the additional cost is 560 kW * $10/kW/month * 11 months = $61,600 per year.

Question 5

A system of electricity has 52.9 kVA and 50.5 kW. To get the power factor of the entire load to 95%, how many kVARs of capacitance are needed?

Accepted Answer

0 kVARs

Answer

First, calculate the initial power factor (PF) using the given real power (kW) and apparent power (kVA): PF = kW / kVA = 50.5 kW / 52.9 kVA = 0.9546, or 95.46%. The target power factor is 95%. Since the existing power factor (95.46%) is already higher than the target power factor (95%), no additional kVARs of capacitance are needed. Adding capacitance would overcorrect the power factor.

CEM - Certified Energy Manager Practice Test

CEM - Certified Energy Manager Practice Test

Free Certified Energy Manager Audit & Billing Questions and Answers