Summer Sale Limited Time 65% Discount Offer - Ends in 0d 00h 00m 00s - Coupon code: ecus65

AEE CEM - Certified Energy Manager (CEM)

AEE CEM Premium Access     Download Demo    
Page: 4 / 4
Total 130 questions

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?

A.

15.2 kW

B.

20.6 kW

C.

24.2 kW

D.

25.0 kW

E.

30.3 kW

An energy project implemented today saves $10,000 per year for the next 20 years. Using the 5% interest table, determine the total value of savings at the end of the 20th year?

A.

$124,620

B.

$146,907

C.

$200,000

D.

$330,660

E.

$496,991

A cooling tower is delivering water to a chilled-water plant. The cooling tower outlet temperature has a 6°C approach temperature to the ambient air, wet-bulb temperature. The outside air conditions are 20°C dry bulb, 60% relative humidity. Using the psychrometric chart, at what temperature can the cooling tower deliver water to the chilled-water plant?

A.

13°C

B.

17°C

C.

21°C

D.

25°C

Which of the following is NOT a typical benefit of performance contracting from the building owner's perspective?

A.

Performance contracting is a simple and quick process

B.

Net cash flow can be neutral or positive for the owner

C.

The energy-service company can have a financial incentive to achieve projected savings

D.

Maintenance services provided by the performance contractor can add value to the overall savings achieved

E.

Performance contracting can provide access to external financing when the owner may not have sufficient equity for in-house financing for large projects

Calculate the monthly electric bill for a customer that used 400 kW and 75,000 kwh during one month. Use the following declining block structure for a monthly bill:

SELECT THE CORRECT ANSWER

A.

$3,280

B.

$4, 580

C.

$7,850

D.

$9,660

E.

$12,500

In a PID control system, what is the purpose of the Proportional Gain?

A.

Reacts to change

B.

Reduces/eliminates offset

C.

Senses high load rate

D.

Control point

What is a common method to reduce the impact of voltage imbalance?

A.

Rebalance single-phase loads

B.

Install harmonic filters

C.

Install capacitors to improve power factor on three-phase loads

D.

Reverse phase connections on three-phase motors

What is the purpose of monitoring energy consumption?

SELECT THE CORRECT ANSWER

A.

To establish a basis of management control

B.

To establish when and why there is a deviation in energy consumption patterns

C.

To support analysis of energy information

D.

All of the above

A 3 MW rated wind-powered turbine has a rotor diameter of 113 meters. What is the efficiency of the wind turbine at rated power if it is operating in wind power calculated at 8.6 MW? Assume an air density of 1.225 kg/m³.

A.

28.4%

B.

34.9%

C.

42.7%

D.

59.3%