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AEE Certified Energy Manager (CEM) Sample Questions:

1. How much energy (kJ) is required to heat 2 kg of water from 25°C to 2 kg of water at 100°C? (The specific heat of water (C) is 4.2 kJ/kg-°C. Assume no system losses.)

A) 630 kJ
B) 840 kJ
C) 420 kJ
D) 510 kJ

2. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings in a project that upgraded lighting in a large manufacturing plant?

A) Option C - Whole facility measurement
B) Option E - Stipulated savings
C) Option A - Retrofit isolation: key parameter measurement
D) Option D - Calibrated simulation
E) Option B - Retrofit isolation: all parameter measurement

3. Which electric rate tariff would best cost justify a thermal energy storage (TES) system?

A) High electricity rate and low peak-demand rate
B) Low electricity rate and low peak-demand rate
C) Great differential between high season and low season electricity rates
D) Great differential between off-peak and on-peak time-of-use electricity rates
E) Great differential between high season and low season demand rates

4. A controller has a signal output that can range from 4 to 20 mA (milli-amperes). The controller regulates the output temperature from a three-way mixing valve from 5°C to 15°C. What is the control gain?

A) 0.6
B) 1.2
C) 1.6
D) 0.8
E) 1.4

5. In a typical compressed air system, energy can be saved by which of the following actions?

A) Decreasing supply air pressure
B) Reducing the capacity of the compressed air receiver tanks
C) Reducing the air distribution pipe size
D) Move the inlet air filter to a warmer location
E) Raising the air pressure

Solutions: