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BU EXAM > Building Utilities 2 - First Exam > Flashcards

Building Utilities 2 - First Exam Flashcards

1
Q

What is a “form of energy” generated by friction, induction or chemical change, having magnetic, chemical and radiant effect?

A

Electricity

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2
Q

It is the “motion of free electrons” through a solid conductor.

A

Electricity

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3
Q

It is the “invisible force” that provides light, heat, sound, and motion.

A

Electricity

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4
Q

What is the “simplest form of matter”?

A

Elements

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5
Q

What is the “smallest piece of an element” containing all of the properties of that element?

A

Atoms

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6
Q

It is the “center portion of an atom” containing the protons and neutrons

A

Nucleus

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7
Q

What is the “positively charged” atomic particles?

A

Protons

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8
Q

It is the “uncharged” atomic particles

A

Neutrons

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9
Q

(TRUE or FALSE) The atomic number is “equal” to the number of protons in the nucleus of an atom.

A

TRUE

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10
Q

What “identifies” the element?

A

Atomic number

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11
Q

What is the “negatively charged” particles?

A

Electrons

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12
Q

It is the orbits in which electrons “move around the nucleus” of an atom

A

Electron Orbitals

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13
Q

What is the “outermost ring” of electrons in an atom?

A

Valence electrons

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14
Q

What “unit of quantity” comprises approximately “6.25 x 10^18 electrons”?

A

Coulomb

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15
Q

It represents a “rate of flow of one(1) coulomb” or 6.25 x 10^18 electrons/second through a given cross section.

A

Ampere

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16
Q

It is the “unit of electric potential”. What is the “electromotive force” or “potential difference” between two points in an electric field which will move a charge of one(1) coulomb between these points?

A

Volt or Voltage

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17
Q

It is the “unit of resistance” in which will “allow one(1) ampere of current to flow” when one(1) volt is impressed upon it.

A

Ohm

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18
Q

It is the “unit of electric power”. What is the rate or measure of power used or consumed?

A

Watt

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19
Q

It is the “unit of electric power” or the “rate of doing electrical work”.

A

Watt

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20
Q

It is the “unit of energy” or the “capacity for doing work”.

A

Watt-hours

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21
Q

What is the “flow or rate” of electric force in a conductor?

A

Electric current

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22
Q

(TRUE or FALSE) A Current will NOT flow if a circuit is formed comprising a complete loop.

A

FALSE. A Current “will only flow” if a circuit is formed comprising a complete loop.

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23
Q

It is the “source of voltage”, “a closed loop of wiring”, “an electric load”, and a means of “opening and closing” the circuit.

A

Electric current

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24
Q

What are used to “supply emergency lighting circuits” for hallways, stairways, exits, and to energize police and fire alarm systems and certain types of signal systems.

A

Storage batteries

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25
What cell of battery, when fresh, "generates an EMF of 1.5 volts". It is used for flashlights, smoke, fire alarm, and detectors?
Dry cell battery
26
What cell of battery "produces 2.1 volts each" and 6 cells connected in series (+ -) which allows them to produce the 12.6-(12) volts used by the "automobile(cars)".
Wet cell battery
27
What cell of battery contain a "liquid electrolyte solution" which consist of sulfuric acid and water. It is also known as "vented/flooded acid batteries".
Well cell battery
28
What cell of battery in which the electrolytes are in form of "moist paste". Its electrochemical cells convert stored "chemical energy into electrical energy".
Dry cell battery
29
What is used for "generating" electric current?
Generators
30
What type of generator is the "bulk of electrical energy" utilized today which is in the form of "alternating current", including energy for power and lighting?
Alternating Current Generator / Alternators
31
What type of generator "furnish electrical energy" for elevators, escalators, intercommunicating telephone systems, control of signal systems, and clock systems?
Direct Current Generators
32
It "generates its own EMF" when exposed to light and thus "convert light directly into electric current" because of its simplicity and relative accuracy, and "photovoltaic cells".
Photovoltaic cell
33
What is used for converting "electrical energy to mechanical energy"?
Motors
34
It is used for "converting one(1) voltage to another", from "lower to higher" or from higher to lower.
Transformers
35
What is used for changing "alternating current to direct current" and vice versa?
Rotary converters
36
It is a type of electrical machine which "acts as mechanical rectifier, inverter, or frequency converter".
Rotary converters
37
What "electrical device" which converts alternating current, which periodically reverses direction to direct current, which flows in only "one direction".
Rectifier
38
It is a process which "straightens" the direction of current.
Rectification
39
What are the two(2) types of current?
Alternating and Direct Current
40
What type of current which is periodically "varying in time rate and in direction". It rises from zero(0) to maximum, falls to zero(0), reverses its direction, and again returns to zero(0)?
Alternating Current
41
What type of current which flows at a "constant time rate and in the same direction"?
Direct Current
42
What is the derived "unit of frequency" in the International System of Units (SI) and is defined as "cycles per one second"?
Hertz (symbol: Hz)
43
Who is named after "hertz"? He is the first person to provide conclusive proof of the "existence of electromagnetic waves".
Heinrich Rudolf Hertz
44
One example of a "primary source of electric power" for the city's industries, being harnessed by the Agus IV Hydroelectric Plant.
Maria Cristina Falls
45
It is a "system of conductors and components" forming a complete path for current to travel.
Electric Circuit
46
What are the three(3) properties of electrical circuit?
> Voltage - Volts - (V) > Current - Amps - (A) > Resistance - Ohms - (Ω)
47
It is the flow of electrical charge, "measured in Amperes (A)".
Current
48
Two(2) types of current flow
-Conventional Current -Electron Flow
49
What current flow assumes that current "flows out of the positive side" of the battery, through the circuit, and back to the negative side of the battery?
Conventional Current
50
What current flow which electrons "flows out of the negative side" of the battery, through the circuit, and back to the positive side of the battery?
Electron Flow
51
What is the "force (pressure)" that causes current to flow? It is measured in Volts (V).
Voltage
52
How much is the "standard volts in the Philippines", alternating at 60 cycles per sec.?
220 volts
53
What is needed if you are a foreigner, traveling to Philippines with a device that does not accept 220 volts @ 60 Hertz?
Voltage converter
54
It is the "opposition of current flow", which is measured in Ohms (Ω)?
Resistance
55
What is the "electrical form of friction" in AC electricity?
Impedance
56
In a Direct Current circuit, the "Impedance" is called _______.
Resistance
57
What are the factors that influences the conductor resistance?
- Composition of the Conductor - Length of Wire - Cross sectional area of Wire - Temperature
58
What law states that Current in a "resistor varies in direct proportion to the voltage" applied to it and is inversely proportional to the resistor's value?
Ohm's Law
59
What is directly related to the "amount of current and voltage" within a system? It is measured in "watts".
Electrical Power / Power
60
It is the effective "utilization of available energy" by reducing peak loads and "lowering demand charge".
Electric Load Control
61
It is the installation’s electric loads are analyzed and scheduled to restrict demand by shifting large loads to off-peak hours and controlled to avoid coincident operation.
Load scheduling and Duty-cycle control
62
It is where "demand is continuously metered", and an alarm is set on when a predetermined demand level has exceeded.
Demand Metering Alarm
63
It also called “rate control”, it is an automated version of the demand metering alarm system, where it automatically disconnects or reconnects loads as required.
Automatic Instantaneous Demand Control
64
This controller operates by "comparing the actual rate of energy usage to the ideal rate", and controls KW demand by controlling the total energy used within a metering interval.
IDEAL CURVE CONTROL
65
These are computerized systems which continuously "forecast the amount of energy remaining in the demand interval", then examine the status and priority of each of the connected loads and decide on the proper course of action
Forecasting systems
66
What is used to measure energy, the factor of time is introduced, such that; energy = power x time?
KWH meters
67
It is where an electrical circuit may be defined as a "complete conducting path" carrying current from a source of electricity to and through some electrical device or load and back to the source.
Branch circuit
68
What type of branch circuit in which the components are "connected in tandem". All separate loads of the circuit carry the same equal current and the total resistance, R, is the sum of the resistances around the circuit?
Series Circuit
69
What type of branch circuit in which the components or loads are so arranged that the current divides between them. Each outlet has a live wire connected to the current carrying wire of the circuit and also a neutral wire or grounded wire connected to the return wire of the circuit?
Parallel Circuit
70
What law states that "The sum of all the voltage drops in a series circuit equals the total applied voltage"?
Kirchhoff’s Voltage Law (KVL)
71
What law states that "The total current in a parallel circuit equals the sum of the individual branch currents"?
Kirchhoff’s Current Law (KCL)
72
It is circuit that contains "only one path for current flow". If the path is open anywhere in the circuit, current stops flowing to all components.
Series Circuit
73
It is a circuit that contains "more than one path for current flow". If a component is removed, then it is possible for the current to take another path to reach other components.
Parallel Circuit
74
What is the technical term for the common word "work"? is the rate at which energy is used.
Power
75
What is the product of "Power and Time"?
Work
76
It is synonymous with Fuel. (expressed in BTU).
Energy

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