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Free Certified Energy Manager (CEM) Practice Questions

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Exam style questions across every CEM domain

Last Update 4 days ago
Total Questions : 130

Start with our free CEM practice questions, carefully crafted to mirror the domains, phrasing, and difficulty of the real Energy Management exam. Each CEM exam question comes with a detailed rationale that explains not just which answer is correct but why the others fall short. That's how concepts stick. Use the free set to benchmark yourself: identify your AEE weak domains, see where you're losing marks, and build a focused study plan in minutes.

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Question # 11

What is the main cause of low power factor?

Options:

A.  

Harmonics

B.  

Fluorescent lighting

C.  

Solar flares

D.  

Computers and electronic equipment

E.  

Low-load induction motors

Discussion 0
Question # 12

Which is the best application for variable-speed drives?

Options:

A.  

Reciprocating air compressor

B.  

Waste-water sewer lift pump

C.  

Centrifugal fan motor in a variable-air volume air-conditioning system

D.  

Centrifugal fan motor in a multi-zone air conditioning system

Discussion 0
Question # 13

How can you tell if steam traps in a steam distribution system may NOT be working correctly?

Options:

A.  

Robust flash steam rising from condensate receiver tank vent pipes

B.  

An increase in make-up water requirements relative to steam demand

C.  

Rapid chattering of disk steam traps

D.  

No sound from inverted bucket steam traps

E.  

All of the above

Discussion 0
Question # 14

Infiltration (inward air leakage) in a building is dependent on several factors. Which of the following is least likely to affect or influence infiltration in a building?

Options:

A.  

Outside air wind speed

B.  

Outside air temperature

C.  

Building height

D.  

Fuel type used for heating and cooling

E.  

Poor or missing weatherstripping

Discussion 0
Question # 15

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

Options:

A.  

The pressure gauge

B.  

The exhaust stack temperature sensor

C.  

The boiler room ambient temperature sensor

D.  

The drum water level gauge

E.  

The feedwater temperature sensor

Discussion 0
Question # 16

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?

Options:

A.  

2 Options

B.  

3 Options

C.  

4 Options

D.  

5 Options

E.  

6 Options

Discussion 0
Question # 17

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?

Options:

A.  

0.6

B.  

0.8

C.  

1.2

D.  

1.4

E.  

1.6

Discussion 0
Question # 18

How much fuel is required to heat 50 kg water from 20°C water to 200°C saturated steam? Assume the boiler is 80% efficient (based on the higher-heating value of the fuel).

Options:

A.  

127.2 MJ

B.  

169.3 MJ

C.  

210.5 MJ

D.  

511.2 MJ

Discussion 0
Question # 19

A gas-fired boiler is operating with 31.9% excess air. A feedwater economizer is used to reduce the stack temperature rise from 310°C to 160°

C.  

Using the natural gas combustion efficiency tables in your workbook, find the energy savings from the economizer as a percentage of historical fuel consumption.

Options:

A.  

1.2%

B.  

3.1%

C.  

5.8%

D.  

7.1%

E.  

9.3%

Discussion 0
Question # 20

Which of the following steam turbines will likely not provide steam output at a useable temperature for industrial processes?

Options:

A.  

Extraction turbine

B.  

Back-pressure turbine

C.  

Condensing turbine

D.  

Answers A and B

Discussion 0

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