Training CEM For Exam, CEM Latest Training

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AEE Certified Energy Manager (CEM) Sample Questions (Q23-Q28):

NEW QUESTION # 23
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.)

A. $52.20/year
B. $44.88/year
C. $64.66/year
D. $88.29/year
E. $70.97/year

Answer: C

NEW QUESTION # 24
Which is the best application for variable-speed drives?

A. Centrifugal fan motor in a multi-zone air conditioning system
B. Waste-water sewer lift pump
C. Centrifugal fan motor in a variable-air volume air-conditioning system
D. Reciprocating air compressor

Answer: C

NEW QUESTION # 25
Natural gas costs $4.80/GJ. How much does it cost to heat 500 liters of water from 18°C to 50°C using a natural gas water heater with an efficiency of 85%? [The efficiency and fuel price are both based on HHV.
The specific heat of water (C) is 4.2 kJ/kg-°C.]

A. $0.76
B. $1.44
C. $1.25
D. $0.25
E. $0.38

Answer: A

Explanation:
To calculate the cost of heating water using natural gas:
Step 1: Compute Energy Required to Heat the Water
Given:
* Mass of water= 500 L = 500 kg
* Temperature rise (#T)= 50°C - 18°C = 32°C
* Specific heat of water (Cp)= 4.2 kJ/kg-°C
Energy Required (Q)=m×Cp×#T
=500×4.2×32
=67,200 kJ=67.2 MJ
A white paper with black text and numbers AI-generated content may be incorrect.

NEW QUESTION # 26
Which of the following instruments is most useful for tracking long-term boiler performance?

A. The pressure gauge
B. The exhaust stack temperature sensor
C. The feedwater temperature sensor
D. The drum water level gauge
E. The boiler room ambient temperature sensor

Answer: B

NEW QUESTION # 27
What instrument determines flow rate by measuring pressure differential?

A. Psychrometer
B. Pitot tube
C. Infrared camera
D. Ultrasonic flow meter
E. Hot-wire anemometer

Answer: B

Explanation:
APitot tubemeasuresflow rateby determining thepressure differentialin a fluid.
Why is a Pitot Tube the Correct Answer?
* It measuresdynamic pressureandstatic pressurein a moving fluid.
* Using Bernoulli's equation, it calculatesvelocityandflow rate.
Analysis of Other Options:
* Psychrometer (A):Measures humidity, not flow rate.
* Infrared camera (B):Detects temperature differences, not pressure.
* Hot-wire anemometer (C):Measures air velocity using heat dissipation, but not pressure differential.
* Ultrasonic flow meter (E):Measures flow using sound waves, not pressure.
Thus, the correct answer isD. Pitot tube.

NEW QUESTION # 28
......

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