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AEE CEM - Certified Energy Manager (CEM)

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Total 130 questions

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 off-peak and on-peak time-of-use electricity rates

D.

Great differential between high season and low season electricity rates

E.

Great differential between high season and low season demand rates

Which of the following is/are benefits of commissioning?

A.

Ensures a system is designed to operate as intended

B.

Ensures a system is installed to operate as intended

C.

Ensures staff know how to operate a system as intended

D.

Ensures staff know how to maintain a system as intended

E.

All of the above

What is the Energy Use index (EUl) for a 4,000 m2 building that uses the following amountsof energy each year?

A.

403,311 kJ/m²-yr

B.

625,600 kJ/m²-yr

C.

855,250 kJ/m²-yr

D.

1,612,000 kJ/m²-yr

E.

3,220,800 kg/m²-yr

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]

A.

$5,000/yr

B.

$10,000/yr

C.

$20,000/yr

D.

$30,000/yr

E.

$40,000/yr

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?

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

If installed without ancillary equipment, photovoltaic power cells generate what type of power?

A.

Sinusoidal alternating current

B.

Square-wave alternating current

C.

Direct current

What is the main cause of low power factor?

A.

Harmonics

B.

Fluorescent lighting

C.

Solar flares

D.

Computers and electronic equipment

E.

Low-load induction motors

A hot-water boiler has a cut-in set point of 65°C on the hot water supply temperature and a differential set point of 10°C. What is the hot-water supply temperature that causes the boiler to turn off?

A.

55°C

B.

65°C

C.

75°C

D.

It depends on the return water temperature

What instrument determines flow rate by measuring pressure differential?

A.

Psychrometer

B.

Infrared camera

C.

Hot-wire anemometer

D.

Pitot tube

E.

Ultrasonic flow meter

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

A.

A range around a set point with no change in state even though there is a change in sensor input

B.

A system which changes the output of a controller based on how fast a variable is moving from or to a set point

C.

The delay in response of a system to a controlled change

D.

A value that has been assigned to a controlled variable

E.

The difference between a sensor variable and its set point