Building Utilities By Alfred
Buildings are designed in different ways and mostly depend on how it will be used. The quiz below is designed to see how much you understand from the building utilities course on Mep-Mechanical, electrical, plumbing and acoustics. Try it out and see if you need more hours to study. All the best!
Questions and Answers
- 1.
The clarity of a sound, particularly a message conveyed by sound, such that it can be easily and completely understood. A slurred sound may be well heard but the message it carries may still not be well understood, it is inarticulate. Also, a clear and distinct sound may be drowned out by a nearby louder noise, rendering the message not understandable, inarticulate. Echoes also cause articulation problems. Articulation is most often measured in some form of a desired signal to unwanted noise ratio. (Sound Acoustics Terminology)
- A.
A. Intelligibility
- B.
B. Lively
- C.
C. Articulation
Correct Answer
C. C. ArticulationExplanation
Articulation refers to the clarity and distinctness of a sound, particularly in conveying a message. It means that the sound can be easily understood and comprehended. A slurred sound may be audible but the message it carries may not be well understood, making it inarticulate. Similarly, a clear sound may be overshadowed by a louder noise, making the message unintelligible. Articulation is often measured by the desired signal to unwanted noise ratio. Therefore, the correct answer is c. Articulation.Rate this question:
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- 2.
. An apparent shift in the frequency occurring when an acoustic source and listener are in motion relative to each other, the frequency increasing when the source and the listener approach each other and decreasing when they move apart. (LA 010)
- A.
A. wave front
- B.
b.droppler effect
- C.
C. logarithm effect
Correct Answer
B. b.droppler effectExplanation
The phenomenon described in the question is known as the Doppler effect. It refers to the change in frequency of a wave when the source of the wave and the observer are in relative motion. When the source and the listener approach each other, the frequency appears to increase, resulting in a higher pitch. Conversely, when they move apart, the frequency appears to decrease, resulting in a lower pitch. This effect is commonly observed in everyday situations, such as the change in pitch of a siren as a vehicle passes by.Rate this question:
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- 3.
The process of defining the desirable condition of sound in an acoustic space. It integrates the direct, early and late reflections with the reverberation, including a sense of timing and direction for each into an appropriate and desirable acoustic condition for the listener. It combines both the art and science of sound. It requires an understanding of the purpose to be served by each acoustic space. As an art form, it recognizes the aesthetic side of sound, the impression that most people prefer to have of each particular type of sound that exists in some particular place. As a science, it is based on psychoacoustics. (Sound Acoustics Terminology)
- A.
A. voicing
- B.
B. waving
- C.
C. articulating
Correct Answer
A. A. voicingExplanation
The process of defining the desirable condition of sound in an acoustic space is referred to as voicing. This involves integrating the direct, early, and late reflections with reverberation, as well as considering timing and direction for each sound. Voicing combines both the art and science of sound, recognizing the aesthetic side and the impression that people prefer in different spaces. It is based on psychoacoustics, making it a scientific approach to achieving the desired acoustic condition for the listener.Rate this question:
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- 4.
Sound that exists within a limited frequency range, between a lower set frequency and a set upper frequency. The difference between the lower and upper frequency is specified to be equal to the lower frequency. The octave sequence for the note "C" starts at 31 Hz and continues thru 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1k Hz, 2k Hz, 4k Hz, 8k Hz and ends at 16k Hz. (k = thousand). (LA 010) (Sound Acoustics Terminology)
- A.
A. pitch
- B.
B. octave
- C.
C. band
Correct Answer
B. B. octaveExplanation
An octave is a musical interval between two frequencies where the higher frequency is exactly double the lower frequency. In this question, the given sound exists within a limited frequency range, and the difference between the lower and upper frequency is specified to be equal to the lower frequency. This is characteristic of an octave. Therefore, the correct answer is b. octave.Rate this question:
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- 5.
A single number rating of the performance of a building material or construction assembly in preventing the transmission of airborne sound, derived by comparing the laboratory TL test curve for the material or assembly to a standard frequency curve. (LA 014)
- A.
A. impact insulation class
- B.
B. airborne sound transmission
- C.
C. sound transmission class
Correct Answer
A. A. impact insulation classExplanation
The correct answer is "a. impact insulation class". Impact insulation class is a single number rating that measures the performance of a building material or construction assembly in preventing the transmission of airborne sound. It is derived by comparing the laboratory TL (transmission loss) test curve for the material or assembly to a standard frequency curve. This rating specifically focuses on the material's ability to reduce the impact noise caused by footsteps, dropped objects, or other physical impacts.Rate this question:
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- 6.
The higher the impact insulation class rating, the less effective is the construction in isolating impact noise. The IIC rating replaces the previously used Impact Noise Rating and is approximately greater to the INR rating + 51 db for a given construction. (LA 014)
- A.
A. true
- B.
B. false
- C.
C. maybe
Correct Answer
B. B. falseExplanation
The explanation for the given correct answer is that the statement is false. The higher the impact insulation class rating, the more effective is the construction in isolating impact noise, not less effective. The IIC rating is a replacement for the previously used Impact Noise Rating and is approximately greater than the INR rating + 51 db for a given construction.Rate this question:
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- 7.
A unit for measuring the apparent loudness of a sound, judge by a group of listeners to be equal to the loudness of a 1000 hertz reference sound judge by a group of listeners to be equal in loudness to the given sound. (LA 011)
- A.
A. metric sabin
- B.
B. resonance
- C.
C. sone
Correct Answer
C. C. soneExplanation
The correct answer is c. sone. A sone is a unit for measuring the apparent loudness of a sound. It is determined by a group of listeners who judge the loudness of the given sound to be equal to the loudness of a 1000 hertz reference sound. The sone scale is based on the subjective perception of loudness by humans.Rate this question:
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- 8.
A measure of the clarity of sound based on the comprehension of the message being conveyed by sound. A "cat, bat, tat, rat... type of recognition test. The conversational version of Articulation. (Sound Acoustics Terminology)
- A.
A. Intelligibility
- B.
B. Lively
- C.
C. Articulation
Correct Answer
A. A. IntelligibilityExplanation
Intelligibility refers to the measure of the clarity of sound based on the comprehension of the message being conveyed by sound. It can be determined through tests like the "cat, bat, tat, rat..." type of recognition test. Intelligibility is different from articulation, which is the clear and precise pronunciation of words. Lively, on the other hand, does not relate to the clarity of sound or the comprehension of the message being conveyed.Rate this question:
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- 9.
An empirically determined index, which combines into a single value the effect of temperature, humidity and air movement on the sensation of warmth or cold felt by the human body. The numerical value is that of the temperature of still saturated air which could induce an identical sensation. (ME 030)
- A.
A. Design Work Pressure
- B.
B. Effective Pressure
- C.
C. Effective Temperature
Correct Answer
C. C. Effective TemperatureExplanation
The correct answer is c. Effective Temperature. The explanation for this is that the given description is talking about an index that combines temperature, humidity, and air movement to determine the sensation of warmth or cold felt by the human body. The index is based on the temperature of still saturated air that would induce the same sensation. Therefore, the term "Effective Temperature" best describes this concept.Rate this question:
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- 10.
The toothed portion of the threshold plate at both ends of an escalator or moving walk, designed to mesh with the groove surface of the moving steps or tradeway. (ME 013)
- A.
A. combplate
- B.
B. track
- C.
C. newel
Correct Answer
A. A. combplateExplanation
The toothed portion of the threshold plate at both ends of an escalator or moving walk is called a combplate. It is designed to mesh with the groove surface of the moving steps or tradeway, ensuring a smooth transition for passengers getting on or off the escalator. The combplate helps prevent tripping hazards by preventing gaps between the steps and the floor. It also helps guide passengers in the correct direction and prevents objects from getting caught in the moving parts of the escalator.Rate this question:
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- 11.
Classification for A fire assembly having a 1-hour or 1/12-hour fire-resistance rating for protecting openings in 1-hour or 2-hour fire separation, exit stairway and vertical shafts. (ME 065)
- A.
A. Class A
- B.
B. Class B
- C.
C. Class C
Correct Answer
B. B. Class BExplanation
A fire assembly with a 1-hour or 1/2-hour fire-resistance rating is classified as Class B. This classification is used for protecting openings in 1-hour or 2-hour fire separations, exit stairways, and vertical shafts. Class B fire assemblies have a higher level of fire resistance compared to Class A and Class C, making them suitable for these specific applications.Rate this question:
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- 12.
A fire involving flammable liquid , as gasoline, oil, and grease, which must be extinguished by excluding air and inhibiting the release of combustible vapors. (ME 066)
- A.
A. Class A fire
- B.
B. Class B fire
- C.
C. Class C fire
Correct Answer
B. B. Class B fireExplanation
The given description mentions a fire involving flammable liquids such as gasoline, oil, and grease. These types of fires are classified as Class B fires. Class B fires require a different approach for extinguishing as compared to other classes of fires. They must be extinguished by excluding air and inhibiting the release of combustible vapors. Therefore, the correct answer is Class B fire.Rate this question:
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- 13.
A dry-pipe sprinkler system through which after flow is controlled by a valve operated by fire detection devices more sensitive than those in the sprinkler heads. It is used when an accidental discharge would damage valuable materials. (ME 066)
- A.
A. preaction system
- B.
B. dry-pipe system
- C.
C. deludge system
Correct Answer
A. A. preaction systemExplanation
A preaction system is a type of sprinkler system that uses fire detection devices that are more sensitive than those in the sprinkler heads. This system is used when there is a risk of accidental discharge that could damage valuable materials. Unlike a dry-pipe system, which only releases water when a sprinkler head is activated, a preaction system requires two steps for water to be discharged. First, the fire detection devices must sense a fire, and then a valve is opened to allow water to flow through the sprinkler heads. This extra level of control helps prevent accidental water damage.Rate this question:
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- 14.
A unit of heat equal to the quantity of heat required to raise the temperature of one kilogram of water 1 degree Celsius at a pressure to one atmosphere, equivalent to 1000 small calories. (ME 038)
- A.
A. calorie
- B.
B. large calorie
- C.
C. therm
Correct Answer
A. A. calorieExplanation
The given definition describes a unit of heat that is required to raise the temperature of one kilogram of water by one degree Celsius. This unit is equivalent to 1000 small calories. Therefore, the correct answer is a. calorie.Rate this question:
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- 15.
It is expressed as the temperature difference required to cause heat flow through a unit area of material of given thickness at the rate of one heat per unit time. (ME 039)
- A.
A. thermal transmittance
- B.
B. U-value
- C.
C. thermal resistance
Correct Answer
C. C. thermal resistanceExplanation
The given statement describes thermal resistance, which is a measure of a material's ability to resist the flow of heat. It is expressed as the temperature difference required to cause heat flow through a unit area of material of given thickness at the rate of one heat per unit time. Therefore, the correct answer is c. thermal resistance.Rate this question:
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- 16.
The transfer of heat by the circulatory motion of the heated parts of a liquid or gas owing to a variation in density and the action of gravity. (ME 039)
- A.
A. conduction
- B.
B. transmittance
- C.
C. convection
Correct Answer
C. C. convectionExplanation
Convection is the correct answer because it involves the transfer of heat through the movement of a liquid or gas. In this process, the heated parts of the fluid rise due to a decrease in density, creating a circulation or convection current. This movement is facilitated by the force of gravity. Convection is different from conduction, which involves the transfer of heat through direct contact between objects, and transmittance, which refers to the ability of a material to allow the passage of heat or light.Rate this question:
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- 17.
A preformed, non-structural insulating board of foamed plastic or cellular glass. Its insulation having closed-cell structures, as extruded polystyrene and cellular glass, are moisture resistant and may be used with contact with the earth. (ME 040)
- A.
A. batt insulation
- B.
B. loose-fill insulation
- C.
C. rigid board insulation
Correct Answer
C. C. rigid board insulationExplanation
The correct answer is c. rigid board insulation. This is because the description provided matches the characteristics of rigid board insulation, which is a preformed, non-structural insulating board made of foamed plastic or cellular glass. Rigid board insulation typically has closed-cell structures, such as extruded polystyrene and cellular glass, which make it moisture resistant and suitable for use in contact with the earth.Rate this question:
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- 18.
An air-conditioning assembly containing the fans, filters, and other components necessary to treat and distribute conditioned air to an entire building or to specific zones within the building. (ME 046)
- A.
A. damper
- B.
B. chiller water plant
- C.
C. air-handling unit
Correct Answer
C. C. air-handling unitExplanation
An air-handling unit is a correct answer because it is a system that contains fans, filters, and other components necessary to treat and distribute conditioned air. It is responsible for circulating air throughout a building and maintaining a comfortable indoor environment. A damper is a device used to control airflow, while a chiller water plant is a system that cools water for air conditioning purposes. Therefore, the air-handling unit is the most appropriate choice in this context.Rate this question:
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- 19.
A system of mechanical ventilation in which fresh air is forced into the space to be ventilated from a chamber at a pressure slightly higher than atmospheric pressure, so as to expel stale air. (ME 048)
- A.
A. cross-ventilation
- B.
B. centrifugal ventilation
- C.
D. plenum ventilation
Correct Answer
C. D. plenum ventilationExplanation
Plenum ventilation is a system of mechanical ventilation that works by forcing fresh air into a space at a slightly higher pressure than the surrounding atmosphere. This higher pressure helps to expel stale air from the space, effectively ventilating it. Cross-ventilation refers to the natural flow of air through a space due to openings on opposite sides, while centrifugal ventilation involves the use of a fan or blower to create airflow. Therefore, plenum ventilation is the correct answer based on the given explanation.Rate this question:
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- 20.
An air-conditioning system in which high velocity ducts supply conditioned air from a central plant to each zone where it mixes with room air and is further heated or cooled in an induction or fan-coil unit. (ME 047)
- A.
A. dual-duct system
- B.
B. all-water system
- C.
C. air-water system
Correct Answer
C. C. air-water systemExplanation
The given description states that the air-conditioning system uses high velocity ducts to supply conditioned air from a central plant to each zone. In this system, the conditioned air mixes with room air and is further heated or cooled in an induction or fan-coil unit. This indicates that both air and water are involved in the process of heating or cooling the air. Therefore, the correct answer is c. air-water system.Rate this question:
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- 21.
What is the color coding for piping of Pneumatic Division? (CDEP IV-13)
- A.
A. yellow
- B.
B. white
- C.
C. gray
Correct Answer
C. C. grayExplanation
The color coding for piping in the Pneumatic Division is gray.Rate this question:
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- 22.
What is the color coding for piping of Steam division? (CDEP IV-53)
- A.
A. yellow
- B.
B. white
- C.
C. blue
Correct Answer
B. B. whiteExplanation
The correct answer is b. white. In industrial settings, white color coding is commonly used for piping in the steam division. This color coding helps to differentiate steam pipes from other types of pipes and ensures safety by indicating the presence of high-temperature steam.Rate this question:
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- 23.
. A new air-conditioning system which answers the need to respond to changes in room cooling capacities of controlling air flow. (CDEP IV-46)
- A.
A. VAV
- B.
B. VRV
- C.
C. Split type
Correct Answer
B. B. VRVExplanation
The correct answer is VRV. VRV stands for Variable Refrigerant Volume, which is a type of air-conditioning system that allows for individual control of air flow and temperature in different rooms or zones. This system is designed to respond to changes in room cooling capacities, making it an ideal choice for spaces with varying cooling needs. Split type air-conditioning systems and VAV (Variable Air Volume) systems may also offer some level of control, but VRV systems are specifically designed to address the need for flexibility and responsiveness in room cooling capacities.Rate this question:
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- 24.
A safety device of a passenger elevator which reduces the collision shock of a car or counterweight due to over travel beyond the lowest stop. This device stops the car or counterweight safely. (CDEP IV-57)
- A.
A. fascia plate
- B.
B. limit switch
- C.
C. buffer
Correct Answer
C. C. bufferExplanation
A buffer is a safety device in a passenger elevator that helps reduce the collision shock when the car or counterweight over travels beyond the lowest stop. It is designed to stop the car or counterweight safely, preventing any damage or injury that could occur from the impact. The buffer absorbs the excess energy and cushions the impact, ensuring a smooth and controlled stop. This safety feature is crucial in preventing accidents and protecting the passengers and the elevator system.Rate this question:
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- 25.
An engine or motor operated by steam, gas, air, electricity, liquid or gaseous fuels, liquids in motion or other forms of energy whose main function is to drive or operate, either directly of indirectly, other mechanical equipment. (CDEP IV -51
- A.
A. prime mover
- B.
B. unfired pressure vessel
- C.
C. process machine
Correct Answer
A. A. prime moverExplanation
A prime mover refers to an engine or motor that is powered by various sources of energy such as steam, gas, air, electricity, or liquid or gaseous fuels. Its primary function is to drive or operate other mechanical equipment, either directly or indirectly. In this context, a prime mover is the correct answer as it aligns with the definition provided in the question.Rate this question:
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- 26.
Mid frequency unit used in acoustical design of theaters. (MIT Notes)
- A.
A. 130 Hz
- B.
B. 60 Hz
- C.
C. 500 Hz
Correct Answer
C. C. 500 HzExplanation
The mid frequency unit used in the acoustical design of theaters is 500 Hz. This frequency range is important for creating balanced sound and ensuring clear dialogue and music reproduction in a theater setting. It falls within the mid-range frequencies where most human speech and musical instruments are centered, making it a crucial frequency to consider in theater acoustics.Rate this question:
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- 27.
In refrigerating systems containing more than _____________, stop valves shall be installed in inlets and outlets of compressors, outlets of liquid receivers, and in liquid and suction branch headers. (NBC 220)
- A.
A. 7 kilograms
- B.
B. 8 kilograms
- C.
D. 9 kilograms
Correct Answer
C. D. 9 kilogramsExplanation
In refrigerating systems containing more than 9 kilograms, stop valves shall be installed in inlets and outlets of compressors, outlets of liquid receivers, and in liquid and suction branch headers. This is stated in NBC 220.Rate this question:
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- 28.
What is the minimum width between balustrades of an escalator according to the mechanical provision of the National Building Code of the Philippines? (NBC 218)
- A.
A. 560mm
- B.
B. 550mm
- C.
C. 720mm
Correct Answer
A. A. 560mmExplanation
According to the mechanical provision of the National Building Code of the Philippines (NBC 218), the minimum width between balustrades of an escalator is 560mm.Rate this question:
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- 29.
Where a machine room or penthouse is provided at the top of a hoist way, it shall be constructed with sufficient room for repair and inspection. Access shall be by means of an iron ladder or stairs when the room is more than _______ millimeters above the adjacent floor or roof surface. (NBC 218)
- A.
A. 500 mm
- B.
B. 600 mm
- C.
C. 700 mm
Correct Answer
A. A. 500 mmExplanation
The correct answer is a. 500 mm. According to NBC 218, if a machine room or penthouse is located at the top of a hoist way and is more than 500 mm above the adjacent floor or roof surface, it should be constructed with sufficient room for repair and inspection. Access to the room should be provided by means of an iron ladder or stairs.Rate this question:
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- 30.
What is the minimum height above floor level if the window type air conditioners shall be provided with exhaust ducts if the exhaust is discharged into corridors/ hallways/ arcades/ sidewalks, etc…? (NBC 220)
- A.
A. 2.10 m
- B.
B. 2.20 m
- C.
C. 2.30 m
Correct Answer
A. A. 2.10 mExplanation
The minimum height above floor level for window type air conditioners with exhaust ducts, if the exhaust is discharged into corridors/hallways/arcades/sidewalks, etc., is 2.10 m.Rate this question:
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- 31.
What mechanical equipment, coupled with a central air-conditioning system is used to dehumidify and cool the air stream injected into the conditioned space?
- A.
A. chiller unit
- B.
B. air handling unit
- C.
C. fan coil unit
Correct Answer
B. B. air handling unitExplanation
An air handling unit is a mechanical equipment that is used in conjunction with a central air-conditioning system to dehumidify and cool the air stream that is injected into the conditioned space. It is responsible for circulating and filtering the air, removing moisture, and controlling the temperature. The air handling unit typically consists of components such as a blower, filters, heating and cooling coils, and dampers to regulate the airflow. It plays a crucial role in maintaining comfortable indoor conditions by controlling humidity levels and providing conditioned air to the space.Rate this question:
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- 32.
The fire-resistance rating of a hoistway opening protective assemblies other than elevator entrances shall be not less than _____________ as determined with test conducted in the accordance with ANSI/ASME E152 Methods of fire tests of door Assemblies. (ME 008)
- A.
A. 2 hours
- B.
B. 1 ½ hours
- C.
C. 1 hour
Correct Answer
B. B. 1 ½ hoursExplanation
The fire-resistance rating of a hoistway opening protective assembly, other than elevator entrances, should be at least 1 ½ hours. This rating is determined through tests conducted in accordance with ANSI/ASME E152 Methods of fire tests of door Assemblies.Rate this question:
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- 33.
A safety device for preventing the operation of an elevator car unless its door or gate is fully closed. (ME 013)
- A.
A. door interlock
- B.
B. gate lock
- C.
C. door contact
Correct Answer
C. C. door contactExplanation
A door contact is a safety device that prevents the operation of an elevator car unless its door or gate is fully closed. It is designed to detect whether the door is closed properly and if not, it will prevent the elevator from moving. This ensures the safety of passengers and prevents any accidents or injuries that could occur if the elevator were to operate with an open door.Rate this question:
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- 34.
A terminal unit which primarily air draws in room air through a filter and the mixture passes over coils that are either heated or chilled by secondary water from a boiler or chilled water plant. (ME 047)
- A.
A. conduction unit
- B.
B. filter unit
- C.
C. induction unit
Correct Answer
C. C. induction unitExplanation
An induction unit is a terminal unit that draws in room air through a filter and passes it over coils that are either heated or chilled by secondary water from a boiler or chilled water plant. This process helps to regulate the temperature of the air in the room. Therefore, the correct answer is c. induction unit.Rate this question:
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- 35.
A system of mechanical ventilation in which fresh air is forced into the space to be ventilated from a chamber at a pressure slightly higher than atmospheric pressure, so as to expel stale air. (ME 048)
- A.
A. plenum ventilation
- B.
B. chamber ventilation
- C.
. mechanical ventilation
Correct Answer
A. A. plenum ventilationExplanation
Plenum ventilation is a system of mechanical ventilation where fresh air is pushed into a space at a slightly higher pressure than the surrounding atmosphere. This higher pressure helps to expel stale air from the space. The term "plenum" refers to a chamber or space that is used for air distribution. Therefore, plenum ventilation accurately describes the process of using a chamber to force fresh air into a space and expel stale air.Rate this question:
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- 36.
It is a type of reciprocating pump that has a steam cylinder with no lap on valves, a water cylinder and a common piston rod. As there is no lap, the steam is admitted throughout the length of the stoke, hence the pressure volume diagram of the steam end is rectangle. (ME 075)
- A.
A. Power driven pump
- B.
B. Crank Reciprocating Pump
- C.
D. Direct Acting Steam Pump
Correct Answer
C. D. Direct Acting Steam PumpExplanation
The correct answer is d. Direct Acting Steam Pump. This type of pump has a steam cylinder with no lap on valves, a water cylinder, and a common piston rod. The absence of a lap allows steam to be admitted throughout the length of the stroke, resulting in a pressure volume diagram that is rectangular in shape. This design allows for direct action of the steam on the water, making it a direct acting steam pump.Rate this question:
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- 37.
What is the color for of oil-mineral vegetable or animal, flammable or combustible. (ME 084)
- A.
A. Yellow
- B.
B. Brown
- C.
C. Safety Red
Correct Answer
B. B. BrownExplanation
The correct answer is b. Brown. Oil, whether it is mineral, vegetable, or animal-based, typically has a brown color. This is due to the presence of impurities and contaminants that give it a darker hue. The brown color is a result of oxidation and degradation of the oil over time. Additionally, the brown color can also be an indication of the oil's age and quality.Rate this question:
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- 38.
A rise in temperature occurring without the addition or removal of heat, as when excess water vapor in the air condenses and the latent heat of vaporization of water vapor is converted to sensible heat in the air. (ME 041)
- A.
A. radiant heating
- B.
B. adiabatic heating
- C.
C. enthalpy
Correct Answer
B. B. adiabatic heatingExplanation
Adiabatic heating refers to a rise in temperature that occurs without the addition or removal of heat. In this scenario, excess water vapor in the air condenses, and the latent heat of vaporization of water vapor is converted to sensible heat in the air. This process does not involve any heat transfer with the surroundings, hence it is considered adiabatic heating.Rate this question:
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- 39.
A pie or duct fitting having several outlets for making multiple connections. (ME 043)
- A.
A. bonet
- B.
B. manifold
- C.
C. gathering
Correct Answer
A. A. bonet -
- 40.
A measure of the efficiency of a material in absorbing sound at a specified frequency, equal to the fractional part of the incident sound energy at that frequency absorbed by the material. (LA 013)
- A.
A. Absorption coefficient
- B.
B. noise criteria curve
- C.
C. noise reduction coefficient
Correct Answer
A. A. Absorption coefficientExplanation
The given definition describes the absorption coefficient, which is a measure of how efficiently a material absorbs sound at a specific frequency. It quantifies the fraction of incident sound energy at that frequency that is absorbed by the material. This coefficient is used to evaluate the sound absorption properties of materials and is an important factor in designing spaces with good acoustics. Noise criteria curve and noise reduction coefficient are not directly related to the efficiency of sound absorption, so they are not the correct answers.Rate this question:
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- 41.
Service drop conductors of 300 volts or less which do not pass over other than a maximum of 1.20 meters of the overhang portion of the roof for the purpose of terminating at a through-the-roof service raceway or approved support may be maintained at a minimum of ____________ from ay portion of the roof over which they pass. (NBC p.212)
- A.
A. 500 mm
- B.
B. 600 mm
- C.
C. 1000 mm
Correct Answer
A. A. 500 mmExplanation
Service drop conductors of 300 volts or less are allowed to pass over a maximum of 1.20 meters of the overhang portion of the roof if they are terminating at a through-the-roof service raceway or approved support. In this case, they must be maintained at a minimum distance of 500 mm from any portion of the roof over which they pass.Rate this question:
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- 42.
No parts of the swimming and wading pools shall be placed under existing service drop conductors or any other overhead wiring; nor shall such wiring be installed above the following except: (NBC p.212)
- A.
A. none of the above
- B.
B. diving structures
- C.
C. balconies and area readily accessible
Correct Answer
C. C. balconies and area readily accessibleExplanation
The correct answer is c. balconies and area readily accessible. This means that the swimming and wading pools can have overhead wiring installed above balconies and areas that are easily accessible. However, the wiring cannot be placed under existing service drop conductors or any other overhead wiring, and it cannot be installed above diving structures.Rate this question:
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- 43.
Clearance of electric service drop from above ground at its point of attachment to the building or pedestal shall be not less than: (NBC p. 212)
- A.
A. 2.50 m
- B.
B. 2.80 m.
- C.
D. 3.00 m.
Correct Answer
C. D. 3.00 m.Explanation
The clearance of electric service drop from above ground at its point of attachment to the building or pedestal should be at least 3.00 m. This is stated in the National Building Code (NBC) on page 212.Rate this question:
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- 44.
What is the vertical clearance of an open supply conductors, over 750 V to 22 kV over or under roofs or projections not readily accessible to pedestrians. (NBC p. 213)
- A.
A. 3800 mm
- B.
B. 3900 mm
- C.
C. 4000 mm
Correct Answer
A. A. 3800 mmExplanation
The vertical clearance of an open supply conductor, over 750 V to 22 kV, over or under roofs or projections not readily accessible to pedestrians is 3800 mm.Rate this question:
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- 45.
Is the vertical clearance of unguarded rigid energized parts, over 750 V to 22 kV over roofs accessible to vehicles but not subject to truck traffic. (NBC p. 213)
- A.
A. 3800 mm
- B.
C. 4000 mm
- C.
B. 3900 mm
Correct Answer
B. C. 4000 mmExplanation
The correct answer is c. 4000 mm. According to the National Building Code (NBC) on page 213, the vertical clearance of unguarded rigid energized parts, over 750 V to 22 kV over roofs accessible to vehicles but not subject to truck traffic should be 4000 mm.Rate this question:
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- 46.
Where buildings exceed 15.00 meters in height, overhead lines shall be arranged where practicable so that clear space or zone at least _________ meters (horizontal will be left adjacent to the building or beginning no over _________ meters (horizontal from the building, to facilitate the raising of ladders where necessary for fire fighting. (NBC p. 211)
- A.
A. 1.85 m. / 2.40 m
- B.
B. 1.65 m. / 2.60 m
- C.
C. 1.80 m. / 2.45 m.
Correct Answer
C. C. 1.80 m. / 2.45 m.Explanation
The correct answer is c. 1.80 m. / 2.45 m. According to the National Building Code (NBC) on page 211, when buildings exceed 15.00 meters in height, overhead lines should be arranged so that a clear space or zone of at least 1.80 meters horizontally is left adjacent to the building. Additionally, the clear space or zone should begin no more than 2.45 meters horizontally from the building. This arrangement allows for the raising of ladders when necessary for fire fighting.Rate this question:
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- 47.
The minimum allowable clearance from the highest point of the roof to the service drop conductor as per National building code: (NBC p. 212)
- A.
A. 2.50 m.
- B.
B. 3.00 m.
- C.
C. 2.00 m
Correct Answer
A. A. 2.50 m.Explanation
According to the National building code, the minimum allowable clearance from the highest point of the roof to the service drop conductor is 2.50 m. This means that there must be a distance of at least 2.50 meters between the highest point of the roof and the service drop conductor to ensure safety and compliance with the building code regulations.Rate this question:
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- 48.
The minimum inside diameter for electrical wire conduits as per Philippine Electrical Code:
- A.
A. 3/8” dia.
- B.
B. ½” dia.
- C.
C. 1-1/4” dia
Correct Answer
B. B. ½” dia.Explanation
The minimum inside diameter for electrical wire conduits as per the Philippine Electrical Code is ½" dia. This means that the conduit must have a minimum diameter of half an inch to accommodate the electrical wires. This ensures that there is enough space for the wires to pass through the conduit without causing any damage or obstruction. A smaller diameter conduit may not be able to accommodate the wires properly, leading to potential safety hazards.Rate this question:
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- 49.
A device that is basically a double throw switch of generally 3-pole connection that will automatically transfer the power from the standby generator to the building circuitry during the electrical power failure. (C)
- A.
A. Brown-out Control Switch (BSS)
- B.
B. Automatic Transfer Switch (ATS)
- C.
C. Single Throw Switch (STS
Correct Answer
B. B. Automatic Transfer Switch (ATS) -
- 50.
Specification on the electric wire XHHW refers to: (EL 024 / CDEP VI-22)
- A.
A. Moisture and Heat Resistant Thermoplastic
- B.
B. Moisture and Heat Resistant Cross Linked Thermosetting Polyethylene
- C.
C. Moisture and Heat Resistant Rubber
Correct Answer
B. B. Moisture and Heat Resistant Cross Linked Thermosetting PolyethyleneExplanation
The specification XHHW refers to Moisture and Heat Resistant Cross Linked Thermosetting Polyethylene. This means that the electric wire with this specification is made of a type of polyethylene that has been cross-linked, making it more resistant to moisture and heat. This makes it suitable for use in environments where these factors are a concern, such as outdoor or high-temperature applications.Rate this question:
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Feb 13, 2023Quiz Edited by
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May 25, 2011Quiz Created by
Alfred_abadilla
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