Building System Corell Exam Review

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Questions and Answers

What is the total power dissipated in a circuit with a line resistance of 4.60 ohms and an ampere rating of 52.17A?

  • 12kW
  • 13kW
  • 13.5kW
  • 12.5kW (correct)

The biggest drawback of this centralized AC system type is the difficulty in providing adequate indoor air quality. What is this type of centralized AC system?

  • All-air system (correct)
  • Air and water system
  • All water hydronic system
  • Refrigirant system

What form of electricity exists when there is a build up of oppposite charges on objects separated by an insulator?

  • current electricity
  • direct electricity
  • static electricity (correct)
  • alternating electricity

How many lumens does one candela emit in a steradian?

<p>1 lumen (D)</p> Signup and view all the answers

The power of the original sound source along with distance of measurement from the sound source combine to form the ____ of sound.

<p>Intensity (A)</p> Signup and view all the answers

What is the primary function of a governor in an elevator system?

<p>to prevent the elevator car from over-speeding (B)</p> Signup and view all the answers

What heat exchange process occurs when a fan blows air across the hot coils of an AC unit releasing heat to the outside air?

<p>condensation (D)</p> Signup and view all the answers

It is the ratio of the sound energy that passes through a material to the amount of sound energy that hits the material.

<p>sound transmission loss (C)</p> Signup and view all the answers

Which HVAC system is best suited for a high-rise building in a temperate climate?

<p>Air-water system (C)</p> Signup and view all the answers

What geometric shape of a hall provides a low degree of laterality of sound?

<p>reverse fan-shaped hall (D)</p> Signup and view all the answers

Which of the following technologies has significantly contributed to the increased speed and efficiency of modern elevators?

<p>Gearless traction machines (B)</p> Signup and view all the answers

If the resistance of a circuit increases while the voltage remains constant, the current will:

<p>decrease (B)</p> Signup and view all the answers

A resistor with a resistance of 10 ohms is connected to a 24-volt battery. What is the power dissipated by the resistor?

<p>57.6 W (C)</p> Signup and view all the answers

What factor should be considered when sizingan HVAC system for a building?

<p>All the above (D)</p> Signup and view all the answers

Which elevator door type will you recommend to permit simultaneous loading and unloading to reduce passenger transfer time and avoid discomfort?

<p>double-opening door (B)</p> Signup and view all the answers

Which type of fire detector is most sensitive to smoldering fires?

<p>photoelectric smoke detector (B)</p> Signup and view all the answers

What is the primary components of DX system that directly interacts with the refrigerant?

<p>evaporator coil (C)</p> Signup and view all the answers

Which type of fire extinguisher is suitable for Class B fires involving flammable liquids?

<p>dry chemical extinguisher (C)</p> Signup and view all the answers

Which of the following is a critical factor to consider when selecting a fire suppression system for a museum with a large collection of artwork on canvas?

<p>the system's potential to damage the artwork with water or chemical residue (A)</p> Signup and view all the answers

What is a potential disadvantage of escalators in crisscross arrangement?

<p>view obstruction (A)</p> Signup and view all the answers

What is the primary disadvantage of fluorescent lighting?

<p>short lifespan (C)</p> Signup and view all the answers

Which escalator arrangement is best for creating a dramatic vertical connection between floors?

<p>crisscross (B)</p> Signup and view all the answers

What is the ideal speed for an escalator in a shopping mall?

<p>0.5 m/s (A)</p> Signup and view all the answers

What is the primary concern associated with elevator bi-parting doors in high-traffic areas?

<p>potential for pinching injuries (C)</p> Signup and view all the answers

The coefficient of performance (COP) of a refrigeration system is defined as:

<p>the ratio of heat removed to work input (A)</p> Signup and view all the answers

What is the term for the ratio of reflected light to incident light?

<p>reflectance (A)</p> Signup and view all the answers

What is the key advantage of pre-action sprinkler systems?

<p>they release water only when a fire is detected (D)</p> Signup and view all the answers

In a direct-espansion HVAC system, how is heat transferred from the indoor space to the refrigerant?

<p>evaporation (D)</p> Signup and view all the answers

It is a type of fire alarm system when each fire detection or signaling device is assigned a unique coded frequency.

<p>coder system (A)</p> Signup and view all the answers

Convenience outlets, though counted as part of the general lighting load, shall be limited to___ outlets on a 20-ampere circuit.

<p>10 outlets (A)</p> Signup and view all the answers

What is a potential drawback of using a water mist system in a museum with high ceilings and large open spaces?

<p>the water droplets may not reach the fire source effectively (A)</p> Signup and view all the answers

What is the principle of layering light?

<p>using layers of light to create different moods and functions (B)</p> Signup and view all the answers

Which of the following components is used to reduce the pressure of the refrigerant in a vapor compression system?

<p>thermostatic expansion valve (C)</p> Signup and view all the answers

What is the primary advantage of using an elevator center-opening door in a commercial building?

<p>faster operation speed (A)</p> Signup and view all the answers

Which of the following is NOT a common type of water treatment process?

<p>aeration (A)</p> Signup and view all the answers

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What is the primary factor influencing the design of a fire sprinkler system?

<p>building occupancy (A)</p> Signup and view all the answers

What is the significance of the spectral locus on the CIE chromacity diagram?

<p>it represents the range of colors produced by a single wavelength of light (A)</p> Signup and view all the answers

What is the primary advantage of a decentralized water heating system?

<p>higher energy efficiency (B)</p> Signup and view all the answers

What is the maximum slope allowed for an escalator?

<p>30 degrees (C)</p> Signup and view all the answers

what is the purpose of a fuse or a circuit breaker in an electrical distribution system?

<p>to protect the system from excessive current (D)</p> Signup and view all the answers

What is a potential disadvantage of gas-based fire suppression systems?

<p>they can be detrimental to the environment (A)</p> Signup and view all the answers

Which of the following is NOT a common technique for reducing noise transmission through a floor-ceiling assembly?

<p>using hard, reflective ceiling materials (D)</p> Signup and view all the answers

What type of fittings should be used to connect the drain pipe of a lavatory to the stack pipe?

<p>sanitary tee (C)</p> Signup and view all the answers

A type of elevator machine consisting of a dc or ac motor, the shaft of which is directly connected to a brake wheel and drivbing sheave; more efficient, and has longer life.

<p>gearless traction machine (C)</p> Signup and view all the answers

Reverberation time is primarily influenced by which of the following factors?

<p>room volume and surface absorption (A)</p> Signup and view all the answers

This vent provides circulation of air between drainage and vent system; serves to ease pressures of a specific area of a system.

<p>relief vent (B)</p> Signup and view all the answers

What is the primary function of a building envelope?

<p>to protect the occupants from the elements (D)</p> Signup and view all the answers

Which escalator arrangement is often used in department stores and shopping centers?

<p>crisscross (B)</p> Signup and view all the answers

A type of standpipe that is filled with water at all times, is connected to a permanent water supply that is capable of meeting flow and pressure requirements.

<p>automatic-wet standpipe (B)</p> Signup and view all the answers

It is recommended that the surfaces of the front part of an auditorium must be highly____ to reinforce direct sound and thow it to the rear of the room.

<p>reflective (A)</p> Signup and view all the answers

What is the minimum size of a hose connection for a Class I standpipe system?

<p>64 mm (B)</p> Signup and view all the answers

Which sound reflections help us understand speech?

<p>early lateral reflections (A)</p> Signup and view all the answers

What treatment will you recommend for a room to produce a more natural sound and contribute to enhance ambience in a room?

<p>diffusion (D)</p> Signup and view all the answers

In this automatic sprinkler system type, the compressed air rushes out, allowing water to enter the pipe through a dry-pipe valve as soon as the sprinkler heads open.

<p>dry-pipe system (A)</p> Signup and view all the answers

The lobby width between two banks of service elevators should not be less than ____ meters.

<p>5.00 m (D)</p> Signup and view all the answers

What is the primary purpose of a SIamese connection on a standpipe system?

<p>to provide a connection point for the fire department (C)</p> Signup and view all the answers

How does the human eye accommodate to focus on objects at different distances?

<p>by changing the shape of the lens (C)</p> Signup and view all the answers

The process by which the human eye adjusts its sensitivity to different light levels is known as:

<p>adaptation (B)</p> Signup and view all the answers

The minimum sizes of a hose connection for a Class III standpipe is:

<p>38 and 64 mm (D)</p> Signup and view all the answers

What is the primary function of a siphon jet water closet?

<p>to use vacuum to flush waste (B)</p> Signup and view all the answers

What is the critical distance in room acoustics?

<p>the distance at which the direct sound level equals the reverberant sound level (C)</p> Signup and view all the answers

Which type of circuit breaker is commonly used in residential and commercial applications?

<p>molded case circuit breaker (MCCB) (A)</p> Signup and view all the answers

What parts comprise the indoor unit of the split-type air conditioning systems?

<p>cooling coil, air filter, blower, drain pipe, fins (B)</p> Signup and view all the answers

A school classroom measuring 24' x 30' is lightd with 10-40w flurescent lmp. Calculate the initial and maintained illumination in foot candle with the following variables: UF-0.35, MF-0.70, 80 lumens/watt/lamp

<p>35 fc (C)</p> Signup and view all the answers

This lamp technology produces light by passing an electric current through a gas that ends emits light when ionized by the current

<p>Discharge lamp technology (D)</p> Signup and view all the answers

Circuit breakers and fuses are typically classified based on their:

<p>All the above (D)</p> Signup and view all the answers

A basic element of an incandescent bulb is the filament which is usually made of _____.

<p>tungsten wire (C)</p> Signup and view all the answers

They are sounds that arrive within 50 milliseconds (0.05S) of the direct sound; they are integrated with the direct sound, thus, increasing intelligibility.

<p>early reflections (B)</p> Signup and view all the answers

What is the primary factor that determines the type of roping arrangement in an elevato system?

<p>building's height (A)</p> Signup and view all the answers

A vent located on the highest branch interval; typically does not require a relief vent, and connects to the stack vent and not to the vent stack.

<p>loop vent (C)</p> Signup and view all the answers

What is the primary purpose of sound difusers in a room?

<p>to scatter sound waves evenly (B)</p> Signup and view all the answers

What is the primary purpose of a trouble signal in a fire alarm and detection system (FDAS)?

<p>to indicate a system malfunction (C)</p> Signup and view all the answers

What is the primary function of an electrical receptacle?

<p>to provide a connection point for electrical devices (C)</p> Signup and view all the answers

What is the potential drawback of using fan-coil units (FCUS) in a large building?

<p>High maintenance requirements (B)</p> Signup and view all the answers

This type of water closet is designed for the low pressure and water velocity of close-coupled tank; the water enters the bowl off-center extremely quiet making it ideal for toilets adjoining sleeping areas.

<p>siphon vortex (B)</p> Signup and view all the answers

In a residential setting, what color is typically used for the hot wire connected to a light switch?

<p>black (A)</p> Signup and view all the answers

This class of standpipe system is used as first aid fire appliances by building occupants and firefighters for fire suppression and during mop-up operations; designed for 100gpm and 65psi outlet pressure.

<p>Class II standpipe (C)</p> Signup and view all the answers

A method where water is distributed through normal water pressure from public water main for use in low rise buildings.

<p>up-feed method (A)</p> Signup and view all the answers

Which type of photoreceptor cell in the human eye is primarily responsible for color vision and fine detail?

<p>cones (B)</p> Signup and view all the answers

In a commercial building, what color is often used for the neutral conductor in a 240V circuit?

<p>white (C)</p> Signup and view all the answers

The primary function of the evaporator in a vapor compression refrigeration cycle is to:

<p>remove heat from the refrigerated space (B)</p> Signup and view all the answers

What is the primary factor that influences the perceived brightness of a light source?

<p>all the above (D)</p> Signup and view all the answers

What is the Sabine formula used to calculate?

<p>reverberation time (C)</p> Signup and view all the answers

What is the minimum number of steps required in the landing platform of an escalator system?

<p>2 steps (B)</p> Signup and view all the answers

What is the purpose of busbars in a switchboard?

<p>to distribute power to diferent circuits (A)</p> Signup and view all the answers

Which of the following components is used to reduce the pressure of the refrigerant in a vapor compression system?

<p>thermostatic expansion valve (D)</p> Signup and view all the answers

What is the relationship between sound transmission loss and sound insulation?

<p>directly proportional (B)</p> Signup and view all the answers

What is the role of a fire alarm control panel in an addressable fire alarm system?

<p>to monitor and control the entire fire alarm system (C)</p> Signup and view all the answers

Which type of roping arrangement is most commonly used in high-rise buildings?

<p>1:1 roping (A)</p> Signup and view all the answers

Which of the following is NOT a primary factor afecting sound transmission loss through a wall assembly?

<p>ambient temperature (D)</p> Signup and view all the answers

In a facility, where would you typically find a switchgear assembly?

<p>in a power plant or substation (C)</p> Signup and view all the answers

The primary purpose of the condenser in a vapor compression refrigeration system is to:

<p>condense the refrigerant vapor into liquid (C)</p> Signup and view all the answers

Which of the following factors can affect the sound transmission loss of a window?

<p>all the above (D)</p> Signup and view all the answers

How does a coded fire alarm system differ from a conventional system?

<p>it uses digital signals instead of analog signals (A)</p> Signup and view all the answers

What is the diference between a point-type smoke detector and a line- type smoke detector?

<p>Point-type detectors monitor a specific point in a room (C)</p> Signup and view all the answers

Which type of water closet is most commonly found in commercial and institutional settings?

<p>wall-hung water closet (D)</p> Signup and view all the answers

Flashcards

Power Dissipation

The total electrical power dissipated in a circuit due to line resistance.

All-air System

A centralized AC system where air is the only medium used for heating and cooling.

Static Electricity

An electrical charge imbalance between objects separated by an insulator.

Lumen

The amount of light emitted by a candela within a unit solid angle (steradian).

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Intensity of Sound

A measure of the sound power per unit area.

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Governor (Elevator)

A mechanical safety device in an elevator system to prevent over-speeding.

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Condensation (HVAC)

The change of state from a gas to a liquid, releasing heat.

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Sound Transmission Loss

The ratio of sound energy passing through a material to the sound energy hitting it.

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Air-water System

An HVAC system that uses both air and water to condition the air.

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Reverse Fan-Shaped Hall

A hall shape that minimizes sound reflections from the side walls, leading to poor sound distribution.

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Gearless Traction Machines

Elevators propelled by a motor directly connected to the hoisting cables without gears.

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Effect of Increased Resistance on Current

The current will decrease, as described by Ohm's Law (I = V/R).

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Power Dissipated by Resistor

The rate at which electrical energy is converted into another form of energy, such as heat.

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HVAC System Sizing Factors

Factors such as building size, climate, occupancy, and insulation should be considered.

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