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Pass the AEE Certified Energy Manager (CEM) CEM Questions and answers with ValidTests

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Questions # 1:

Insulation has a thermal conductivity of 0.04 Watt/(m-°C). What is the R-value for this insulation when it is 5-cm thick?

Options:

A.

0.8 (m²-°C)/Watt

B.

1.25 (m²-°C)/Watt

C.

2.20 Watt/m²

D.

20 Watt/(m²-°C)

E.

20 (m²-°C)/Watt

Expert Solution
Questions # 2:

A facility uses 250,000 kWh in a 31-day billing period. The peak demand in the billing period is 1,200 kW. What is the facility partial load factor?

Options:

A.

28%

B.

33%

C.

45%

D.

66%

E.

77%

Expert Solution
Questions # 3:

What type of passive heat exchanger can wrap around an evaporator coil to precool entering air and reheat the air after the cooling coil without adding more moisture to the supply air stream?

Options:

A.

Desiccant heat wheel

B.

Plate and frame

C.

Heat pump

D.

Heat pipe

E.

Run-around coil

Expert Solution
Questions # 4:

You are using a performance contract to finance the added cost of using more-efficient equipment in the construction of a new building. Which of the following International Performance Measurement and Verification Protocol (IPMVP) options would you use to verify annual energy savings?

Options:

A.

Option A - Retrofit isolation: key parameter measurement

B.

Option B - Retrofit isolation: all parameter measurement

C.

Option C - Whole facility measurement

D.

Option D - Calibrated simulation

E.

Option E - Stipulated savings

Expert Solution
Questions # 5:

A 25-kW motor, at full load, drives a centrifugal fan that produces 160,000 liters per second (l/s) of ventilation air. If the fan speed is reduced to a flow rate of 150,000 l/s, what is the new load on the motor?

Options:

A.

15.2 kW

B.

20.6 kW

C.

24.2 kW

D.

25.0 kW

E.

30.3 kW

Expert Solution
Questions # 6:

Periodic commissioning of a building automation system (BAS) might include which of the following?

Options:

A.

Removing temperature set point overrides

B.

Retraining staff on the BAS functions and programming

C.

Verify controls are still responsive to the BAS

D.

All of the above

E.

Answers A and C

Expert Solution
Questions # 7:

What is the best type of heat exchanger to recover and transfer latent heat energy from one air stream to another?

Options:

A.

Heat pipe

B.

Shell and tube

C.

Ceramic recuperator

D.

Desiccant heat wheel

E.

Run-around system

Expert Solution
Questions # 8:

A 1OO-kW packaged engine-generate combined heat and power (CHP) system has the specifications listed below. The CHP equipment operates fully loaded for 8.000 h/yr. What isthe annual fuel cost for the ChP equipment?

CMP equipment specifications: Electrical output 100kw Electrical efficiency: 25% Thermal recovery efficiency: 50*6 Total CMP efficiency: 75%

Additional information: Fuel cost: S3.S0/GJ Electricity cost S0.06/kWh Previous water heating efficiency: 8046 Mot water usage: 75,700 liters/day (21 *C temperature rise)

[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]

Options:

A.

$28,900/yr

B.

$32,668/yr

C.

$43,776/yr

D.

$52,222/yr

E.

$58,300/yr

Expert Solution
Questions # 9:

Thermal scans of electrical equipment are useful for:

Options:

A.

Locating areas of high power factor

B.

Reading current carrying capacity of installed conductors

C.

Locating a loose electrical connection

D.

Measuring the load on a refrigerant system

Expert Solution
Questions # 10:

What is the definition of lamp life for a fluorescent lamp?

Options:

A.

The time at which lamps begin to fail

B.

The time at which 50% of a large sample of lamps have failed

C.

The time at which 70% of a large sample of lamps have failed

D.

The time at which lumen output has reduced by 50%

E.

The time at which lumen output has reduced to 70% of the initial light output

Expert Solution
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