THE DESIGN, OPERATION AND
MAINTENANCE OF BUI SYSTEMS,
PART II QUESTIONS & ACCURATE
COMPLETE SOLUTIONS
electricity - Correct Answer ✔✔ a convenient form of energy because it readily moves
from one location to another
conductor - Correct Answer ✔✔ is a medium (usually a wire or cable) through which
electrons flow
current - Correct Answer ✔✔ the flow of electrons
electromagnet - Correct Answer ✔✔ A megnent that is made by passing on electric
current through a coil of wire rapped around an iron core
transformer - Correct Answer ✔✔ A device that increases or decreases the voltage of
alternating current
Straight-line meter rate - Correct Answer ✔✔ A single rate per kilowatt-hour regardless
of the quantity of electricity used
Step-meter rate - Correct Answer ✔✔ A price per kilowatt-hour for all usage based on
the range or step into which the total usage falls. This rate form is seldom used.
Block-meter rate - Correct Answer ✔✔ he price per kilowatt-hour charges for each of
several blocks of use. Usually, the price per kilowatt-hour decreases as the number of
kilowatt-hours increases. The block-meter rate is popular because it does not include
any demand charge.
Flat-demand rate - Correct Answer ✔✔ This rate does not use a meter, but it is based
on a price per kilowatt of connected load. Connected load is the total of the rated watts
for all of the equipment on the premises
three-part rate - Correct Answer ✔✔ contains all three separate charges: customer
charge, energy charge, and demand charge.
Alternating Current (AC) - Correct Answer ✔✔ A flow of electric charge that regularly
reverses its direction.
Direct Current (DC) - Correct Answer ✔✔ Electric current that flows in only one direction
,single phase - Correct Answer ✔✔ Of or relating to a circuit energized by a single
alternating electromotive force. General office lighting and receptacles operate use this
leads - Correct Answer ✔✔ the external wiring connections to an electrical system
grounding - Correct Answer ✔✔ safely connecting electrical equipment and devices to
the earth
short circuit - Correct Answer ✔✔ unintended connection between two conductors in an
electrical circuit that offers less resistance than the intended circuit device
volt (v) - Correct Answer ✔✔ the pressure of electric current in an electrical circuit
ampere (A) - Correct Answer ✔✔ a measure of the flow of electric current in an
electrical circuit
ohm - Correct Answer ✔✔ measure for resistance to the flow of electricity in a
conductor
watt - Correct Answer ✔✔ power of electricity. when one volt causes a current of one
ampere to flow in a circuit Power (W) = Voltage (V) x Current A
wire - Correct Answer ✔✔ a single conductor and may be solid or stranded
cable - Correct Answer ✔✔ multiple conductor with each component conductor
insulated from the others
electrical circuit - Correct Answer ✔✔ A complete path through which electric current
can flow
feeder - Correct Answer ✔✔ heavy-gauge conductors that transfer electricity from the
entry of the electric service (switch-gear or switchboard) into the building to the local
distribution points (panels)
branch circuit - Correct Answer ✔✔ lighter-gauge conductors that run from local
distribution points (panels) to the electrical equipment that will use the electricity. Used
with HVAC equipment, elevators, lighting, and receptacles
dedicated branch circuit - Correct Answer ✔✔ an electrical circuit or telephone line
reserved exclusively for one appliance or occupant.
Relay - Correct Answer ✔✔ an electrically operated switch
fuse - Correct Answer ✔✔ is a device that protects an electrical circuit from excessive
current
, circuit breaker - Correct Answer ✔✔ protects an electrical circuit from excessive current
Ground Fault Circuit Interrupter (GFCI) - Correct Answer ✔✔ A device that interrupts
and de-energizes an electrical circuit to protect a person from electrocution.
switchgear - Correct Answer ✔✔ the main service equipment for the electrical
distribution system in a building
variable frequency drive (VFD) - Correct Answer ✔✔ senses the load on an electric
motor and adjusts its speed accordingly
motor - Correct Answer ✔✔ an electrically driven motors converts electric energy into
mechanical energy
motor starter - Correct Answer ✔✔ are devices for initiating the flow of electrical power
and providing electrical overload protection to the motor
Across the line Starter - Correct Answer ✔✔ permits the motor to achieve full load as
quick as possible, cheap
Reduced-Voltage Starter - Correct Answer ✔✔ used to protect equipment or to limit the
inrush of current during motor start up
Reversing Starter - Correct Answer ✔✔ reverse the rotation on the motor, goes in two
directions
Two-Speed Starter - Correct Answer ✔✔ the motor runs at full speed or half speed
single service - Correct Answer ✔✔ one line from the electric utility company terminates
in one or more unit substations or switchboards.It is the least expensive in initial
installation cost and the least reliable
dual Service - Correct Answer ✔✔ consists of two full-capacity lines from the utility
company, originating from different distribution source; each line from the utility
company connects to ;that can transfer the load from one service to the other through a
tie circuit breaker that is normally open; if one service fails, the load on the failed service
is automatically transferred to the other
normal reserve service - Correct Answer ✔✔ modification of the dual service; except
the entire load receives its power from one line
lockout/tagout - Correct Answer ✔✔ A formal procedure for taking equipment out of
service and ensuring that it cannot be operated until a qualified person has removed the
lockout or tagout device (such as a lock or warning tag).
MAINTENANCE OF BUI SYSTEMS,
PART II QUESTIONS & ACCURATE
COMPLETE SOLUTIONS
electricity - Correct Answer ✔✔ a convenient form of energy because it readily moves
from one location to another
conductor - Correct Answer ✔✔ is a medium (usually a wire or cable) through which
electrons flow
current - Correct Answer ✔✔ the flow of electrons
electromagnet - Correct Answer ✔✔ A megnent that is made by passing on electric
current through a coil of wire rapped around an iron core
transformer - Correct Answer ✔✔ A device that increases or decreases the voltage of
alternating current
Straight-line meter rate - Correct Answer ✔✔ A single rate per kilowatt-hour regardless
of the quantity of electricity used
Step-meter rate - Correct Answer ✔✔ A price per kilowatt-hour for all usage based on
the range or step into which the total usage falls. This rate form is seldom used.
Block-meter rate - Correct Answer ✔✔ he price per kilowatt-hour charges for each of
several blocks of use. Usually, the price per kilowatt-hour decreases as the number of
kilowatt-hours increases. The block-meter rate is popular because it does not include
any demand charge.
Flat-demand rate - Correct Answer ✔✔ This rate does not use a meter, but it is based
on a price per kilowatt of connected load. Connected load is the total of the rated watts
for all of the equipment on the premises
three-part rate - Correct Answer ✔✔ contains all three separate charges: customer
charge, energy charge, and demand charge.
Alternating Current (AC) - Correct Answer ✔✔ A flow of electric charge that regularly
reverses its direction.
Direct Current (DC) - Correct Answer ✔✔ Electric current that flows in only one direction
,single phase - Correct Answer ✔✔ Of or relating to a circuit energized by a single
alternating electromotive force. General office lighting and receptacles operate use this
leads - Correct Answer ✔✔ the external wiring connections to an electrical system
grounding - Correct Answer ✔✔ safely connecting electrical equipment and devices to
the earth
short circuit - Correct Answer ✔✔ unintended connection between two conductors in an
electrical circuit that offers less resistance than the intended circuit device
volt (v) - Correct Answer ✔✔ the pressure of electric current in an electrical circuit
ampere (A) - Correct Answer ✔✔ a measure of the flow of electric current in an
electrical circuit
ohm - Correct Answer ✔✔ measure for resistance to the flow of electricity in a
conductor
watt - Correct Answer ✔✔ power of electricity. when one volt causes a current of one
ampere to flow in a circuit Power (W) = Voltage (V) x Current A
wire - Correct Answer ✔✔ a single conductor and may be solid or stranded
cable - Correct Answer ✔✔ multiple conductor with each component conductor
insulated from the others
electrical circuit - Correct Answer ✔✔ A complete path through which electric current
can flow
feeder - Correct Answer ✔✔ heavy-gauge conductors that transfer electricity from the
entry of the electric service (switch-gear or switchboard) into the building to the local
distribution points (panels)
branch circuit - Correct Answer ✔✔ lighter-gauge conductors that run from local
distribution points (panels) to the electrical equipment that will use the electricity. Used
with HVAC equipment, elevators, lighting, and receptacles
dedicated branch circuit - Correct Answer ✔✔ an electrical circuit or telephone line
reserved exclusively for one appliance or occupant.
Relay - Correct Answer ✔✔ an electrically operated switch
fuse - Correct Answer ✔✔ is a device that protects an electrical circuit from excessive
current
, circuit breaker - Correct Answer ✔✔ protects an electrical circuit from excessive current
Ground Fault Circuit Interrupter (GFCI) - Correct Answer ✔✔ A device that interrupts
and de-energizes an electrical circuit to protect a person from electrocution.
switchgear - Correct Answer ✔✔ the main service equipment for the electrical
distribution system in a building
variable frequency drive (VFD) - Correct Answer ✔✔ senses the load on an electric
motor and adjusts its speed accordingly
motor - Correct Answer ✔✔ an electrically driven motors converts electric energy into
mechanical energy
motor starter - Correct Answer ✔✔ are devices for initiating the flow of electrical power
and providing electrical overload protection to the motor
Across the line Starter - Correct Answer ✔✔ permits the motor to achieve full load as
quick as possible, cheap
Reduced-Voltage Starter - Correct Answer ✔✔ used to protect equipment or to limit the
inrush of current during motor start up
Reversing Starter - Correct Answer ✔✔ reverse the rotation on the motor, goes in two
directions
Two-Speed Starter - Correct Answer ✔✔ the motor runs at full speed or half speed
single service - Correct Answer ✔✔ one line from the electric utility company terminates
in one or more unit substations or switchboards.It is the least expensive in initial
installation cost and the least reliable
dual Service - Correct Answer ✔✔ consists of two full-capacity lines from the utility
company, originating from different distribution source; each line from the utility
company connects to ;that can transfer the load from one service to the other through a
tie circuit breaker that is normally open; if one service fails, the load on the failed service
is automatically transferred to the other
normal reserve service - Correct Answer ✔✔ modification of the dual service; except
the entire load receives its power from one line
lockout/tagout - Correct Answer ✔✔ A formal procedure for taking equipment out of
service and ensuring that it cannot be operated until a qualified person has removed the
lockout or tagout device (such as a lock or warning tag).
