CEM BODY OF KNOWLEDGE & STUDY
GUIDE V1.5 - EXAM REVIEW
QUESTIONS (SAMPLE ONLY) AND
ANSWERS WITH SOLUTIONS 2024
What is the basis for Commercial Building Codes by most states?
A. ASHRAE 90.2
B. ASHRAE 90.1
C. ASHRAE 62.2
D. ASHRAE 60.1 - ANSWER Answer:
B. ASHRAE 90.1 - Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings
Standards:
ASHRAE 90.2 - Energy-Efficient Design of Low-Rise Residential Buildings
ASHRAE 62.1 - Ventilation and Acceptable Indoor Air Quality
ASHRAE 62.2 - Ventilation and Acceptable Indoor Air Quality in Residential Buildings
ASHRAE Standard 55 has rules for:
A. Ventilation for acceptable indoor air quality
B. Energy standard for buildings except low rise residential buildings
C. Thermal environmental conditions for human occupancy
D. All of the above - ANSWER Answer:
C. Thermal environmental conditions for human occupancy
ASHRAE 55 - Thermal Environmental Conditions for Human Occupancy
If electricity is selling for $0.06 per KW-hr and is used for electric heating with an efficiency of 90% what
is the equivalent price of natural gas per therm if it can be burned with an efficiency of 80%?
A. $1.33/therm
, B. $1.47/therm
C. $1.56/therm
D. $1.65/therm
E. $1.87/therm - ANSWER C. $1.56/therm
Energy Management Handbook 7th edition:
Energy Cost = Load x 1/efficiency x fuel cost
Energy Cost/load = 1/0.9 x $0.06/kw-hr x 29.3 kw-hr/therm
Energy Cost/load = $1.953/therm = 1/0.8 x fuel cost
fuel cost = $1.56/therm
An energy saving device will save $25,000 per year for 8 years. How much can a company pay for this
device if the interest rate (discount rate) is 15%?
A. $10,000
B. $77,000
C. $112,000
D. $173,000 - ANSWER C. $112,000
P = present value
A = single payment or interest received in a series of n equal annual payments
i = Annual interest rate = MARR
n = the number of annual interest periods
P = A * [(1+i)^n - 1 / i(1+i)^n ]
P = 25,000 * [(1+0.15)^8 - .15(1+0.15)^8]
What would be used to find hot spots or phase imbalances in an AC circuit?
A. Ohmmeter
B. Infrared Camera
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