Questions and Answers of Mechanical And Electrical Systems In Architecture Engineering And Construction

From tables provided in this chapter, approximate the full load rating for a 100 hp, 460 V, three-phase electric motor, in amperes. TABLE 18.24 APPROXIMATE FULL LOAD RATING FOR SELECTED MOTORS, IN
From tables provided in this chapter, approximate the full load rating for a 11⁄2 hp, 120 V, single-phase electric motor, in amperes. TABLE 18.24 APPROXIMATE FULL LOAD RATING FOR SELECTED MOTORS,
From tables provided in this chapter, approximate the full load rating for a 10 hp, 208 V, three-phase electric motor, in amperes.
Nonmetallic (NM-B) cable is commonly used in single family residential installations. From tables provided in this chapter, identify the ampacity of the following conductors:a. NM-B cable with three
From tables provided in this chapter, identify the ampacity of the following conductors:a. No. 500 kcmil aluminum conductor with XHHW-2 insulation and a temperature rating of 60°C/140°Fb. No. 500
From tables provided in this chapter, identify the ampacity of the following conductors:a. No. 4/0 AWG aluminum conductor with THHN insulation and a temperature rating of 60°C/140°Fb. No. 4/0 AWG
From tables provided in this chapter, identify the ampacity of the following conductors:a. No. 8 AWG copper conductor with THHN insulation and a temperature rating of 60°C/140°Fb. No. 8 AWG copper
From tables provided in this chapter, identify the NEMA designation for the following grounding-type devices requiring a 20 A, 250 V four-pole, four-wire, three-phase rating:a. Receptacleb. Plug
From tables provided in this chapter, identify the NEMA designation for the following grounding-type devices used for copy machines and air conditioners requiring a 50 A, 125 V rating:a. Receptacleb.
From tables provided in this chapter, identify the NEMA designation for the following grounding-type devices used for a kitchen range requiring a 50 A, 125/250 V rating:a. Receptacleb. Plug TABLE
From tables provided in this chapter, identify the NEMA designation for the following grounding-type devices used for clothes dryers:a. Receptacleb. Plug TABLE 18.5 CONFIGURATION FOR NONLOCKING
From tables provided in this chapter, identify the NEMA designation for the following heavy-duty grounding-type devices that are rated at 20 A, 125 V, and serve as a connection method for a two-pole,
From tables provided in this chapter, identify the NEMA designation for the following wall-mounted, grounding-type devices used in a residence that are rated at 15 A, 125 V, and serve as a connection
A three-phase, four-wire panelboard must feed 42 circuits. From tables provided in this chapter, identify the frame sizes available to meet this requirement. Three-Phase, Four-Wire Panelboards Frame
A three-phase, four-wire panelboard must feed 42 circuits. From tables provided in this chapter, identify the minimum frame size required. Three-Phase, Four-Wire Panelboards Frame Disconnect Size
A single-phase, three-wire panelboard must feed 36 circuits. From tables provided in this chapter, identify the minimum frame size required. TABLE 18.4 COMMON PANELBOARD AND LOAD CENTER RATINGS AND
A single-phase, three-wire panelboard must feed 30 circuits. From tables provided in this chapter, identify the minimum frame size required. TABLE 18.4 COMMON PANELBOARD AND LOAD CENTER RATINGS AND
Identify materials that can serve as a nonpermeable VDR.
What is zoning?
Describe the types of HVAC distribution system classifications.
Describe the types of HVAC air distribution system arrangements.
Describe the types of pipe arrangements used in allwater and air-water HVAC distribution systems.
Explain the components and operation of a water-loop heat pump (WLHP) system.
Explain the operation of a conventional mixed-air ventilation system.
Explain the operation of a displacement ventilation system.
Explain the operation of a demand controlled ventilation (DCV) system.
Explain the components and operation of an air-side economizer.
Describe the operation of night ventilation precooling (night flush ventilation).
How does a higher altitude affect performance of a HVAC system? What is affected?
A fan in a residential furnace is needed to move 1700 standard cfm (ft3/min) of warm air at a temperature of 120°F. The fan will be installed in a building at an elevation of 6000 ft above sea
A fan in an AHU is needed to move 20 000 standard cfm (ft3/min) of warm air at a temperature of 130°F. The fan will be installed in a building at an elevation of 5000 ft above sea level. Approximate
For the conditions in the previous exercise, describe a good strategy for use of a vapor diffusion retarder.Data from in previous exerciseA building has indoor air conditions of 70°F dry bulb
The heating load of a building at winter design conditions is 1 510 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial gas-fired hot water boilers provided in
The heating load of a building at winter design conditions is 3 210 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial oil-fired hot water boilers provided in
The heating load of a building at winter design conditions is 3 600 000 Btu/hr (with pick-up allowance). From the performance specifications for commercial dual fuel (gas- and oil-fired) hot water
A 10 ft long copper baseboard unit is designed to output 550 Btu/hr per ft at standard design conditions. Estimate its output at 5000 ft above sea level.
Make a visit to a residence. Examine the HVAC system. Make a sketch of the system and identify chief components of the system. Write out control strategies used.
Make a visit to a commercial building. Examine the HVAC system. Identify chief components of the system. Describe control and energy management strategies used.
Review a set of construction drawings of a residence. Examine drawings of the HVAC system. Make a sketch of the system and identify chief components of the system.
Review a set of construction drawings of a commercial building. Examine drawings of the HVAC system. Make a sketch of the system and identify chief components of the system.
What are the advantages of a forced-air system as compared to a hot water system?
What types of materials are most commonly used for forced-air ducts?
What can be done to ensure that the system will be as quiet as possible?
What is the purpose of putting dampers in the ductwork?
What is the purpose of putting turning vanes in the ductwork and where are they used?
When is insulation around the ductwork recommended?
When heating is the predominant function of the forced-air system, what are the recommended locations for the supply and return?
Describe the layout of an extended plenum ductwork arrangement.
Describe the layout of a reducing plenum ductwork arrangement.
Describe the layout of an individual supply ductwork arrangement.
Describe the layout of a perimeter loop ductwork arrangement.
Describe the single-zone and multizone constant air volume systems. Explain the differences between the systems.
How does the equivalent diameter of a duct relate to a rectangular duct section?
Which duct system is more common, the low-velocity or high-velocity system?
Why should air velocity in the ducts be kept below certain limits? Give two reasons.
Why must automatic dampers be designed to operate so they close gradually?
What term is commonly used to refer to the cooling capacity of a cooling unit, and how does it relate to Btu/hr?
What does the term SEER mean, and why is it important to check the SEER of the cooling unit?
What type of equipment may be used when both heating and air conditioning are required?
What factors determine where the supplies and returns are located?
Determine the perimeter length (in inches) and aspect ratio of the following ducts:a. 12 in × 12 inb. 18 in × 12 inc. 24 in × 12 ind. 36 in × 12 ine. 48 in × 12 in
For the duct sizes in the previous exercise, which duct section uses the least material?
Determine the perimeter length (in inches) and aspect ratio of the following ducts:a. 8 in × 8 inb. 16 in × 8 inc. 24 in × 8 ind. 32 in × 8 ine. 40 in × 8 in
For the duct sizes in the previous exercise, which duct section uses the least material?
Determine the perimeter length (in mm) and aspect ratio of the following ducts:a. 200 mm × 200 mmb. 400 mm × 200 mmc. 600 mm × 200 mmd. 800 mm × 200 mme. 1000 mm × 200 mm
For the duct sizes in the previous exercise, which duct section uses the least material?Data From Previous ExerciseDetermine the perimeter length (in mm) and aspect ratio of the following ducts:a.
Determine the equivalent diameter of the following ducts:a. 12 in × 12 inb. 18 in × 12 inc. 24 in × 12 ind. 30 in × 12 ine. 48 in × 12 in
Determine the equivalent diameter of the following ducts:a. 8 in × 8 inb. 16 in × 8 inc. 24 in × 8 ind. 32 in × 8 ine. 40 in × 8 in
The minimum required equivalent diameter of a duct is 16 in but is too deep for the ceiling clearance allowed by the architect’s design. The vertical clearance available for ductwork is 12 in.
The minimum required equivalent diameter of a duct is 30 in but is too deep for the ceiling clearance allowed by the architect’s design. The vertical clearance available for ductwork is 20 in.
The minimum required equivalent diameter of a duct is 34 in but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork is 24 in.
The minimum required equivalent diameter of a duct is 500 mm but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork in the space
The minimum required equivalent diameter of a duct is 900 mm but is too deep for the ceiling clearance allowed by the architect's design. The vertical clearance available for ductwork is 400 mm.
A 12 in diameter galvanized steel (smooth) straight duct section conveys air at 1000 ft3/min. It is 100 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
A 24 in diameter galvanized steel (smooth) straight duct section conveys air at 5000 ft3/min. It is 50 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
A 20 in diameter galvanized steel (smooth) straight duct section conveys air at 3000 ft3/min. It is 45 ft long.a. Determine the pressure loss, in inches of w.c.b. Determine the average velocity of
A 34 in diameter galvanized steel (smooth) straight duct section conveys air at 10 000 ft3/min. It is 42 ft long.a. Determine the pressure loss, in inches of w. c.b. Determine the average velocity of
A 500 mm diameter galvanized steel (smooth) straight duct section conveys air at 2000 L/s. It is 21 m long.a. Determine the pressure loss, in Pa/m.b. Determine the average velocity of air flowing
A 250 mm diameter galvanized steel (smooth) straight duct section conveys air at 500 L/s. It is 21 m long.a. Determine the pressure loss, in Pa/m.b. Determine the average velocity of air flowing
A branch duct will convey air at a volumetric flow rate of 500 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
A branch duct will convey air at a volumetric flow rate of 5000 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
A branch duct will convey air at a volumetric flow rate of 8000 ft3/min. The pressure loss available for this duct is 0.1 in w.c./100 ft. The duct is not lined.a. Identify the minimum diameter of a
Design a forced hot air system for the residence in Appendix D based on the heat loss calculations for the geographic location where you reside.Appendix D SHINGLES
A branch duct will convey air at a volumetric flow rate of 8000 L/s. The pressure loss available for this duct is 10 Pa/m. The duct is not lined.a. Identify the minimum diameter of a round duct.b.
Design a forced-air heating and cooling system for the residence in Appendix D based on the geographic location where you reside.Appendix D SHINGLES (DARK) SHEATHING FASCIA SCREENED VENT 3/8" PLYWOOD
A branch duct will convey air at a volumetric flow rate of 1000 L/s. The pressure loss available for this duct is 10 Pa/m. The duct is not lined.a. Identify the minimum diameter of a round duct.b.
Design a forced-air heating and cooling system for one of the top-floor apartments and one of the lower-floor apartments in Appendix A based on the geographic location where you reside.Appendix A
What are the four different hot water piping arrangements commonly used in residential and light commercial installations? Describe each.
What are the differences between series loop and onepipe hot water systems? What are the advantages of each?
Discuss the two-pipe system, how it works, and its advantages and disadvantages.
Why are multiple heating circuits (zones) often used?
How does a radiant hot water heating panel work?
Describe the following components of a boiler configuration in a hydronic system:a. Expansion tankb. Circulating pumpc. Flow control valved. Safety relief valvee. Air elimination device
What is the one variable that affects the amount of heat given out by a finned tube convector?
Describe the following heat distribution device or terminal unit available to distribute heat to a space:a. Convector unitb. Fan coil unitc. Radiatord. Radiant floor unite. Radiant wall unit
What type of system is most commonly used in a residence?
A 21⁄4 in × 5 in × 0.011-1-in copper-aluminum fin tube baseboard convector has an output of 840 Btu/hr per foot of tube at a fluid temperature of 180°F. A room in a residence has a heating load
A 23⁄4 in × 5 in × 0.020-11⁄4-in copper-aluminum fin tube baseboard convector has an output of 850 Btu/hr per foot of tube at a fluid temperature of 180°F. A classroom in an elementary school
Design a series loop system, two zones, for the residence in Appendix D, based on the heat loss calculations for the geographic location where you reside.Appendix D SHINGLES
A 23⁄4 in × 5 in × 24 gauge-11⁄4-in steel tube convector has an output of 710 Btu/hr per foot of tube at a fluid temperature of 180°F. A classroom in an elementary school has a heating load of

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