Free Certified Energy Auditor Certification MCQ Questions and Answers — Questions and Answers
Question 1: Which of the subsequent systems would be ideal for measurements using a Bourdon gauge?
- Boiler (Correct answer)
- Building envelop
- Lighting
- Electrical supply
Correct answer: Boiler
A Bourdon gauge is a type of mechanical pressure gauge commonly used to measure high pressures in various industrial applications. Boilers operate under high pressure to generate steam, making a Bourdon gauge an ideal instrument for monitoring and ensuring safe operating pressures within boiler systems. It is not typically used for building envelopes, lighting, or electrical supply.
Question 2: The power factor rises when a capacitor bank is added to an electrical system with a lagging current because
- total real power is increased
- total reactive power is increased
- total real power is decreased
- total reactive power is decreased (Correct answer)
Correct answer: total reactive power is decreased
A lagging power factor in an electrical system is typically caused by inductive loads, which draw reactive power. Adding a capacitor bank introduces capacitive reactive power, which counteracts the inductive reactive power. By reducing the net reactive power in the system, the power factor improves (moves closer to 1), making the system more efficient.
Question 3: What one of the following has no bearing on the lighting Coefficient of Utilization?
- The dimensions of the illuminated space
- The type of lamps used (Correct answer)
- The color of the walls, ceiling, and floor in an illuminated space
- The type of luminaire used
Correct answer: The type of lamps used
The Coefficient of Utilization (CU) is a measure of how efficiently a luminaire delivers light to a working plane, taking into account room geometry and surface reflectances. It depends on the dimensions of the space, the reflectance of walls, ceiling, and floor, and the type of luminaire. The *type of lamps used* (e.g., LED, fluorescent) primarily affects the lumen output and efficacy, but not the CU itself, which is about light distribution within the space.
Question 4: What is the most common kind of loss in an AC motor at full load?
- Stray load losses
- Friction and windage losses
- Resistive losses (Correct answer)
- Core losses
Correct answer: Resistive losses
At full load, the most significant losses in an AC motor are typically resistive losses, also known as copper losses (I²R losses). These occur in the stator and rotor windings due to the resistance of the conductors and the current flowing through them. While core losses, friction, windage, and stray load losses also contribute, resistive losses usually dominate at full load.
Question 5: Which of the following can be used during an energy audit to evaluate both HVAC systems and the building envelope?
- Draft gauge
- Chemical smoke (Correct answer)
- Anemometer
- Psychrometer
Correct answer: Chemical smoke
Chemical smoke, often generated by smoke pencils or theatrical smoke machines, is an excellent tool for visualizing air movement. It can be used to detect drafts and air leaks in the building envelope (e.g., around windows, doors, insulation gaps) and to trace airflow patterns within HVAC systems (e.g., checking duct leakage, verifying ventilation effectiveness). This makes it useful for both aspects.
Question 6: Which of the following summaries of the energy auditing procedure most closely resembles an ASHRAE Level 1 audit?
- A thorough inspection of the building, including an analysis of its energy usage and a calculation of the potential costs and savings from any potential energy conservation measures
- An analysis of historical utility bills and benchmarking of the Energy Use Index to other similar buildings
- To calculate the potential savings of energy conservation measures and determine their costs, systems are measured and tested in the field. It is possible to simulate the structure using a computer.
- In order to find low- and no-cost energy efficiency measures, an analysis of current energy use and cost is combined with a tour of the building. (Correct answer)
Correct answer: In order to find low- and no-cost energy efficiency measures, an analysis of current energy use and cost is combined with a tour of the building.
An ASHRAE Level 1 audit, also known as a 'walk-through audit,' is the most basic type of energy audit. It involves a preliminary analysis of historical utility bills and a visual inspection or tour of the building to identify obvious areas of energy waste and low-cost/no-cost energy efficiency measures. It provides a general understanding of energy use without detailed engineering analysis or measurements.
Question 7: Which of the following waste water sources, which can be recycled, is not regarded as greywater?
- Water from showers
- Water from washing machines
- Rain water (Correct answer)
- Water from sinks
Correct answer: Rain water
Greywater refers to wastewater generated from non-toilet plumbing fixtures such as showers, bathtubs, washing machines, and sinks. This water is typically suitable for reuse in applications like irrigation or toilet flushing after minimal treatment. Rainwater, while also a non-potable water source, is collected directly from precipitation and is not considered greywater, which originates from indoor household activities.
Free Certified Energy Auditor Certification MCQ Questions and Answers
Which of the subsequent systems would be ideal for measurements using a Bourdon gauge?