[Q45-Q62] Updated Jan-2026 Exam Engine or PDF for the CEM Tests Free Updated Today!

QUESTION 45
What is a common cause of poor power quality?

QUESTION 46
A heat pump water heater has an annual average coefficient of performance (COP) of 2.1 and heats water from 15°C to 50°C. Hot water use is 100 liters per day, 365 days/yr. The electricity cost is $0.10/kWh. What is the annual water heating cost? (The specific heat of water (C) is 4.2 kJ/kg-°C.)

QUESTION 47
Exhaust gases from an industrial furnace flow through a heat-recovery steam generator, which generates medium-pressure steam. This steam is used in a steam turbine to generate shaft power driving a fan. Which type of combined heat and power (CHP) cycle does this process describe?

QUESTION 48
A refrigerant-to-water heat exchanger can be added to air-conditioning equipment to heat water using the waste heat in the vapor compression refrigerant cycle. Where is this type of heat exchanger located in the refrigerant loop?

QUESTION 49
What term describes the difference between the control signal value and the set point?

QUESTION 50
A new lighting system costs $60,000. The new lighting system has a 15-year life and the minimum required rate of return (MARR) is 15%. How much must the new lighting system save to be life-cycle cost effective?

QUESTION 51
Which of the following best describes a dead band in controls?

QUESTION 52
What is the purpose of monitoring energy consumption?
SELECT THE CORRECT ANSWER

QUESTION 53
Which of the following statements regarding refrigerants is NOT correct?
5ELECT THE CORRECT ANSWER

QUESTION 54
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER

QUESTION 55
If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?

QUESTION 56
What does a manometer measure?

QUESTION 57
Which of the following instruments is most useful for tracking long-term boiler performance?

QUESTION 58
The International Performance Measurement and Verification Protocol (IPMVP) has how many categories (method options) to determine the performance of an energy- or water-consuming system?

QUESTION 59
A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

QUESTION 60
A facility owner is considering installing a new chiller. The installed project cost will be $300,000. The annual savings from the energy-saving project will be $45,000 for the 20-year life of the chiller. If an energy- service company requires a minimum 20% return on investment (pre-tax), will the energy-service company agree to finance this project?

QUESTION 61
What instrument is NOT used to measure temperature?

QUESTION 62
A steam trap with a 6-mm orifice in an 0.8-MPa steam system has failed open. The steam system is pressurized8.760 hours/yr. The steam cost is $15.00 /GJ. Using thetable below, what is the annualcost of the vented steam through the failed steam trap? ignore any condensate return issues.

[The question from the previous image, which was about calculating the annual cost of heat loss through a wall, but had a discrepancy between the calculated cost and the provided answer choices]