Building Services Final Exam with 100%
correct answers
What is a conductor? (glossary) - correct answer ✔✔Material that has very little resistance and permits
electrons to move through it easily
What is a transformer and how is it used? (glossary) - correct answer ✔✔Electric device that uses
electromagnetism to change (step-up or step-down) AC voltage from one level to another
What is a service panel? (glossary) - correct answer ✔✔Electrical device containing fuses or circuit
breakers for protecting the individual circuits of a residence; serves as a means for disconnecting the
entire residence from the distribution system
Define circuit (glossary) - correct answer ✔✔Complete path (when ON) for current to take that includes
electrical control devices, circuit protection, conductors, and loads
What is grounding? - correct answer ✔✔Protects occupants by providing a safe pathway for unwanted
electricity that might otherwise create a hazard
System ground (glossary) - correct answer ✔✔Special circuit designed to protect the entire distribution
system of a residence
Equipment ground (glossary) - correct answer ✔✔Circuit designed to protect individual components
connected to an electrical system
What is the NEC? - correct answer ✔✔National Electric Code. sets the foundation for electrical safety in
residential, commercial, and industrial occupancies. Fire safety
List several different types of PPE - correct answer ✔✔pg. 449
Protective clothing
Safety glasses and goggles
, Rubber work shoes
Safety helmet
Rubber gloves
List the common classes of fires and why they occur - correct answer ✔✔Chapter 20, pg 450
Ordinary combustibles
Flammable liquids
Electrical equipment
Combustible metals
Commercial cooking grease
DC voltage (glossary) - correct answer ✔✔Voltage that flows only in one direction
AC voltage (glossary) - correct answer ✔✔Voltage that reverses its direction of flow at regular intervals
Explain the difference between DC voltage and AC voltage - correct answer ✔✔Chpt 21, pg 456
DC can only flow one way. AC can reverse its flow
Define power (glossary) - correct answer ✔✔Rate of doing work or using energy
Define power factor (glossary) - correct answer ✔✔Ratio of true power used in an AC circuit to apparent
power delivered to the circuit
What is a Btu? (glossary) - correct answer ✔✔British Thermal Unit. Amount of heat required to raise the
temperature of 1 lb of water 1 degree F
Lumen (glossary) - correct answer ✔✔Unit used to measure the total amount of light produced by a light
source
correct answers
What is a conductor? (glossary) - correct answer ✔✔Material that has very little resistance and permits
electrons to move through it easily
What is a transformer and how is it used? (glossary) - correct answer ✔✔Electric device that uses
electromagnetism to change (step-up or step-down) AC voltage from one level to another
What is a service panel? (glossary) - correct answer ✔✔Electrical device containing fuses or circuit
breakers for protecting the individual circuits of a residence; serves as a means for disconnecting the
entire residence from the distribution system
Define circuit (glossary) - correct answer ✔✔Complete path (when ON) for current to take that includes
electrical control devices, circuit protection, conductors, and loads
What is grounding? - correct answer ✔✔Protects occupants by providing a safe pathway for unwanted
electricity that might otherwise create a hazard
System ground (glossary) - correct answer ✔✔Special circuit designed to protect the entire distribution
system of a residence
Equipment ground (glossary) - correct answer ✔✔Circuit designed to protect individual components
connected to an electrical system
What is the NEC? - correct answer ✔✔National Electric Code. sets the foundation for electrical safety in
residential, commercial, and industrial occupancies. Fire safety
List several different types of PPE - correct answer ✔✔pg. 449
Protective clothing
Safety glasses and goggles
, Rubber work shoes
Safety helmet
Rubber gloves
List the common classes of fires and why they occur - correct answer ✔✔Chapter 20, pg 450
Ordinary combustibles
Flammable liquids
Electrical equipment
Combustible metals
Commercial cooking grease
DC voltage (glossary) - correct answer ✔✔Voltage that flows only in one direction
AC voltage (glossary) - correct answer ✔✔Voltage that reverses its direction of flow at regular intervals
Explain the difference between DC voltage and AC voltage - correct answer ✔✔Chpt 21, pg 456
DC can only flow one way. AC can reverse its flow
Define power (glossary) - correct answer ✔✔Rate of doing work or using energy
Define power factor (glossary) - correct answer ✔✔Ratio of true power used in an AC circuit to apparent
power delivered to the circuit
What is a Btu? (glossary) - correct answer ✔✔British Thermal Unit. Amount of heat required to raise the
temperature of 1 lb of water 1 degree F
Lumen (glossary) - correct answer ✔✔Unit used to measure the total amount of light produced by a light
source
