BC Ch. 7 Terms

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Questions and Answers

What is the primary function of a boiler in a building?

To pump water for irrigation
To provide electrical power
To circulate refrigerant
To create steam by heating water (correct)

What is the purpose of a cable tray in large commercial and industrial buildings?

To support the ceiling
Elevated platforms used to cover long distances for routing electrical cables (correct)
To provide a path for water pipes
To support HVAC ductwork

What role does a condenser play in a refrigeration system?

It mixes refrigerant with ammonia
It releases heat to the surrounding area by condensing refrigerant under high pressure and temperature (correct)
It generates heat
It circulates cold water

What is a conductor in the context of building electrical systems?

The metal (such as copper or aluminum) that distributes electricity throughout the building (B) Signup and view all the answers

What is the function of a conduit in electrical installations?

Durable tubing or an enclosure that protects exposed wiring from physical damage (A) Signup and view all the answers

How does a diffusion system function in industrial settings?

It helps distribute air or gas evenly in a workspace (A) Signup and view all the answers

What is NOT a typical use for a cable tray?

To provide structural framework for heavy equipment (A) Signup and view all the answers

What distinguishes a conduit from a cable tray in electrical installations?

Conduits protect wiring from damage while cable trays support and organize the wiring (A) Signup and view all the answers

What is the main purpose of mixing ammonia and water in a sanitation system?

To dilute the ammonia concentration and discharge it safely (A) Signup and view all the answers

What does the electrical service panel primarily do in a building?

Control the overall electrical system's circuit conductors and power supply (C) Signup and view all the answers

During a power outage, what is the primary function of emergency power in a building?

To supply power for essential safety systems such as alarms and fire pumps (D) Signup and view all the answers

What is the main function of an evaporator in a refrigeration system?

To absorb heat from refrigerant and cool the surrounding area (C) Signup and view all the answers

What services do HVAC systems provide in a structured environment?

Heating, ventilation, and air conditioning (A) Signup and view all the answers

What are occupant evacuation elevators specifically designed for?

Enabled self-evacuation during emergencies in tall buildings (D) Signup and view all the answers

What characterizes Phase I operation of elevators during an emergency?

Elevators are recalled to the ground level for firefighters only (C) Signup and view all the answers

In a fire emergency, what happens during Phase II operation of elevators?

Firefighters control the elevators using a special key to reach upper floors (A) Signup and view all the answers

What is the goal of Phase III operation for elevators?

To allow occupants to evacuate before fire services arrive (D) Signup and view all the answers

What role does a refrigerant play in HVAC systems?

To absorb and release heat, facilitating cooling and heating (A) Signup and view all the answers

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Study Notes

Boiler

Primary function: creates steam by heating water for various processes in a building.

Cable Tray

Purpose: serves as elevated platforms for routing electrical cables over long distances in large commercial and industrial buildings.

Condenser

Role in refrigeration: releases heat to the surroundings by condensing refrigerant under high pressure and temperature, crucial for cooling systems.

Conductor

Definition: metal (copper or aluminum) used to distribute electricity throughout a building's electrical system.

Conduit

Function: durable tubing or enclosure designed to protect exposed wiring from physical damage in electrical installations.

Diffusion System

Purpose in industrial settings: mixes ammonia and water to dilute ammonia concentration, then discharges it safely to a sanitary sewer system.

Electrical Service Panel

Purpose: integrates circuit conductors and the power supply to provide control over the building's entire electrical system.

Emergency Power

Usage: supplies power for critical life-safety features, such as fire pumps and alarm systems, during power outages.

Evaporator

Function in refrigeration: absorbs heat from refrigerant, cooling the surrounding area and contributing to the refrigeration cycle.

HVAC Systems

Provide: a combination of heating, ventilation, and air conditioning, essential for maintaining indoor climate control.

Occupant Evacuation Elevators

Design: specifically for the safe self-evacuation of occupants in office buildings over 420 feet tall during emergencies.

Phase I Operation

Elevator response in emergencies: elevators are recalled to the first-floor lobby to remain there for firefighter use.

Phase II Operation

Action during fire emergencies: enables firefighters to control selected elevators to access upper floors using special keys and procedures.

Phase III Operation

Purpose: facilitates occupant evacuation from a building prior to the arrival of firefighters, ensuring safety during emergencies.

Refrigerant

Role in HVAC systems: essential for absorbing and releasing heat, aiding in both cooling and heating processes.

Standby Power

Usage: provides energy for less critical building functions during power outages, ensuring operational continuity for non-essential systems.

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