無料2025年最新のCEM問題集で100%合格保証には最新の サンプル
準備CEM問題解答無料更新には100%試験合格保証 [2025]
質問 # 15
Which motor parameter is the most difficult to measure with precision?
- A. Operating (rotating) speed
- B. Output power capacity
- C. Alternating current (AC) frequency
- D. Input power
- E. Operating load factor
正解：E
質問 # 16
In a performance contract, which group has the greatest investment risk?
- A. The company installing the energy project
- B. The energy-service company
- C. The equipment manufacturer
- D. Risk is shared by the terms in the performance contract
正解：B
質問 # 17
An energy-saving project costs $540,000. The project will have maintenance costs of $25,000 per year. The energy savings from the project are $160,000 per year. The project has a life of 10 years with no salvage value. The minimum attractive rate of return (MARR) is 10%. Using end-of-year cash flows, calculate the net- present value (NPV) of the project.
- A. $311,556
- B. $456,254
- C. $289,575
- D. $154,657
正解：C
解説：
A screenshot of a math formula AI-generated content may be incorrect.
質問 # 18
If the initial design process includes group relamping, how can this reduce the number of lamps required to illuminate a space?
- A. Group relamping reduces the overall amount of lamp breakages, which means fewer lamps are required to illuminate a space.
- B. Group relamping reduces factors that contribute to light loss, which means fewer lamps are required to illuminate a space
- C. Group relamping cannot reduce the number of lamps required to illuminate a space
- D. Group relamping improves the room cavity ratio, which means fewer lamps are required to illuminate a space
- E. Group relamping requires using larger Wattage lamps, which means fewer lamps are required to illuminate a space
正解：B
質問 # 19
A compressed air system has a total volume of 247,500 liters. During a 30-minute break in production (air compressor system turned off and no production demand for compressed air), the system pressure drops from
7 bar, gauge (700 kPa, gauge) to 5 bar, gauge (500 kPa, gauge). Calculate the leakage rate in the compressed air system.
- A. 48,250 liters/minute
- B. 22,750 liters/minute
- C. 8,250 liters/minute
- D. 32,000 liters/minute
- E. 16,500 liters/minute
正解：E
質問 # 20
What instrument is NOT used to measure temperature?
- A. Hot-wire anemometer
- B. Thermometer
- C. Thermistor
- D. Optical pyrometer
- E. Bimetallic thermometer
正解：A
解説：
Step 1: Purpose of Each Instrument
* Hot-wire anemometer# Measures air velocity, NOT temperature.
* Bimetallic thermometer# Measures temperature using metal expansion.
* Thermistor# Measures temperature using resistance change.
* Thermometer# Directly measures temperature.
* Optical pyrometer# Measures high temperatures using infrared radiation.
Since ahot-wire anemometer measures airspeed, not temperature, the correct answer isA. Hot-wire anemometer.
質問 # 21
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. $0.38
- C. $1.25
- D. $0.25
- E. $1.44
正解：A
解説：
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.
質問 # 22
Which of the following is a closed-loop controller?
- A. Manual dimmer for a light switch
- B. Thermostat for an air conditioning unit
- C. Accelerator pedal in an automobile
- D. Time clock schedule controller
正解：B
質問 # 23
Why do electric utility companies transmit power at high voltages?
SELECT THE CORRECT ANSWER
- A. Electrical frequency is more stable
- B. Transmission power losses (12R) are less
- C. Higher voltages are safer
- D. Higher voltages are more stable
正解：B
解説：
Electric utility companies transmit power at high voltages primarily to reduce transmission power losses, which are proportional to the square of the current (I²) multiplied by the resistance (R) of the transmission lines. This relationship is expressed by the formula for power loss: P_loss = I²R.
Key Points:
* Power Loss and Current Relationship:Power losses in transmission lines are directly proportional to the square of the current flowing through them. Reducing the current decreases these losses significantly.
* High Voltage Transmission:By increasing the transmission voltage, the current required to deliver the same amount of power decreases. This is because power (P) is the product of voltage (V) and current (I): P = VI. For a given power level, increasing voltage allows for a corresponding decrease in current.
* Reduced I²R Losses:Lower current results in reduced I²R losses, enhancing the efficiency of power transmission over long distances.
Conclusion:
Transmitting power at high voltages minimizes transmission losses, making it the most efficient method for long-distance electrical power delivery. Therefore, the correct answer is C. Transmission power losses (I²R) are less.
質問 # 24
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. $12,500
- B. $3,280
- C. $7,850
- D. $9,660
- E. $4, 580
正解：D
解説：
We need to calculate the monthly electric bill based on the given pricing structure.
Step 1: Identify Charges from the Table
* Customer charge:$50/month
* Peak demand charge:$10/kW-month
* Electric consumption charges:
* First25,000 kWh@$0.06/kWh
* Excess(75,000 - 25,000) = 50,000 kWh@$0.05/kWh
* Tax:20% of total
A screenshot of a calculator AI-generated content may be incorrect.
質問 # 25
If outside air has a temperature of 30°C dry bulb and 20°C wet bulb, what is the dew point temperature?
- A. 15°C
- B. 30°C
- C. 20°C
- D. 25°C
正解：C
質問 # 26
What is the uniform series present worth factor (P/A, i%, n) for an annual interest rate of 15% and a lifetime of 20 years?
- A. 4.676
- B. 0.214
- C. 6.259
- D. 0.160
正解：C
質問 # 27
An air-conditioning system at full load is rated at 70-kW (thermal cooling) and has a coefficient of performance (COP) of 4.1. What is the electrical load at full load?
- A. 17.1 kW
- B. 46.7 kW
- C. 23.3 kW
- D. 35.0 kW
- E. 70.0 kW
正解：C
質問 # 28
A facility has the thermal cooling load profile shown in the table below. The utility rate tariff has an on-peak time-of-use billing period that begins at 10:00 a.m. and ends at 7:00p.m. Calculate the storage capacity required for a load-shifting operating strategy, to make sure that no thermal cooling Is generated by the chiller during the on-peak utility rate period.
[Question from the previous image, which was about storage capacity for load shifting, but the table was missing]
- A. 66 GJ
- B. 48 GJ
- C. 84 GJ
- D. 72 GJ
正解：A
質問 # 29
An energy-saving project saves $30,000 per year. The project life is 10 years and the company minimum annual rate of return (MARR) is 15%. How much can the project cost and still be cost effective?
- A. $201,123
- B. $150,570
- C. $198,992
- D. $165,903
- E. $188,343
正解：D
質問 # 30
If a boiler cycles on and off too frequently, what control can you adjust to reduce the number of times a boiler cycles on and off?
- A. Reduce the controller differential
- B. Increase the controller set point
- C. Increase the controller differential
正解：C
質問 # 31
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
正解：D
質問 # 32
A facility owner is considering installing a new chiller. The installed project cost will be $300,000. The annual savings from the energy-saving project will be $45,000 for the 20-year life of the chiller. If an energy- service company requires a minimum 20% return on investment (pre-tax), will the energy-service company agree to finance this project?
- A. No
- B. Yes
正解：A
質問 # 33
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