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PSAEIV-ABE BRM > AREA III - Farm Electrification > Flashcards

AREA III - Farm Electrification Flashcards

1
Q

One of the most versatile and widely used forms of energy.

a. Wind
b. Electricity
c. Water
d. Geothermal

A

b. Electricity

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2
Q

Clouds driven by strong winds can gather huge electrostatic charges which are released to the earth in the form of lightning.

a. Chemical Action
b. Adiabatic reaction
c. Friction between moving objects
d. Cyclonic motion of objects

A

c. Friction between moving objects

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3
Q

Certain types of crystals produce a voltage when subjected to pressure.

a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity

A

d. Piezoelectricity

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4
Q

Voltage is produced when the junction of two unlike metals is heated.

a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity

A

b. Thermoelectricity

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5
Q

A material that uses the principle of thermoelectricity.

a. Thermal Conductors
b. Heat Insulator
c. Thermolinks
d. Thermocouples

A

d. Thermocouples

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6
Q

Solar or photo cells convert radiant energy to electrical energy.

a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity

A

c. Photoelectricity

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7
Q

Produces a voltage by operating on the principle of electromagnetic induction.

a. Magnetism
b. Thermoelectricity
c. Photoelectricity
d. Piezoelectricity

A

a. Magnetism

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8
Q

Smallest portion into which an element can be subdivided without losing its physical and chemical properties

a. Molecules
b. Atom
c. Carbon
d. Particle

A

b. Atom

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9
Q

Outermost electrons

a. Negatively-charged Electrons
b. Protons
c. Positively- charged Electrons
d. Valence Electrons

A

d. Valence electrons

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10
Q

if an object contains more number of total electrons than the total protons

A

Negatively charged

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11
Q

if an atom contains fewer number of total electrons than the total protons

A

Positively charged

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12
Q

the amount of electrical charge on a single electron

A

Elementary charge unit (ECU)

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13
Q

used to measure quantity of electric charge; approximately equal to 6.24 x 10^18 ECU.

A

Coulomb (C)

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14
Q

Defined as the rate at which electrical charge flows

a.
b.
c.
d.

A

Current

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15
Q

Causes electric charge to flow in an electrical system having potential difference

A

Electromotive force (emf)

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16
Q

Ability of a material to resist the flow of electrical charge when subjected to a given potential difference

A

Electrical Resistance

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17
Q

property of a material to oppose the flow of electric current

A

Resistivity

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18
Q

materials having an intermediate resistance to electron flow

A

Semiconductors

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19
Q

materials which has low resistance to electron flow

A

Conductors

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20
Q

materials which has high resistance to electron flow

A

Insulators

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21
Q

States that the current flowing in a circuit varies directly with the electrical pressure and inversely with the opposition

A

Ohm’s law

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22
Q

States that the sum of the current in a node must be equal to zero

A

Kirchhoff’s current law

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23
Q

The net voltage around a close circuit is zero

A

Kirchhoff’s voltage law

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24
Q

The common unit of electric power

A

Watt

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25
Q

The common unit of electric resistance

A

Ohm

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26
Q

Power factor for electric motors

A

between 0.6 to 0.8

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27
Q

Power factor for heaters, electric ranges and incandescent lamps.

A

1

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28
Q

The common unit of electric energy consumption

A

watt-hour (Wh)

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29
Q

the voltage across each resistor is directly proportional to the ratio of its resistance to the total series resistance of the circuit

A

Voltage divider

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30
Q

the current divides in inverse proportion to the resistances of the individual parallel elements

A

Current divider

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31
Q

TRUE or FALSE. it is impossible to view a very complicated circuit in terms of much simpler equivalent source and load circuits

A

FALSE

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32
Q

States that any network composed of ideal voltage and current sources, and of linear resistors, may be represented by an equivalent circuit consisting of an ideal voltage source in series with an equivalent resistance.

A

Thevinin’s theorem

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33
Q

States that any network composed of ideal voltage and current sources, and of linear resistors, may be represented by an equivalent circuit consisting of an ideal current source in parallel with an equivalent resistance.

A

Norton’s theorem

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34
Q

Characterized by non-variant current flow in one direction at all times

A

Direct Current (DC)

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35
Q

Characterized by an alternating flow of in two directions

A

Alternating Current (AC)

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36
Q

When voltage and current are in phase, all the power is __________

A

Positive

37
Q

It is “watt-less” and does no useful work.

A

Reactive power

38
Q

property to oppose current change

A

Inductance

39
Q

The amount of electric charge that a capacitor receives for each volt of applied potential

A

Capacitance

40
Q

Power factor improvement can be accomplished on what way?

A

addition of series or
parallel-connected capacitors.

41
Q

This material had the ability to attract bits of
iron.

A

lodestones (Fe3O4)

42
Q

First magnets

A

magnetite or
“lodestones” (Fe3O4)

43
Q

lines of force surrounding a permanent magnet or a moving charged particle.

A

Magnetic fields

44
Q

Quantity of magnetic field force or “push”; also known as magnetic potential difference

A

Magnetomotive force (mmf)

45
Q

It is Analogous to electric voltage (emf).

A

Magnetomotive force (mmf)

46
Q

quantity of total field effect or “substance” of the field; analogous to electric current.

A

Magnetic flux

47
Q

amount of field force (mmf) distributed over the length of the electromagnet.

A

Magnetic field strength (intensity)

48
Q

amount of magnetic field flux concentrated in a given area

A

Magnetic flux density

49
Q

The opposition to magnetic field flux through a given volume of space or material

A

Reluctance

50
Q

Measure of a material’s acceptance of magnetic flux

A

Permeability

51
Q

Describes that the electric field due to electric charges can be derived by Coulomb’s Law.

A

Gauss’s law for electricity

52
Q

states that the net magnetic flux through any (real or imaginary) closed surface is zero.

A

Gauss’ law for magnetism

53
Q

Describes the production of magnetic fields not only by electric currents but by changing electric field as well

A

Ampere’s law

54
Q

Describes the production of electric fields as a result of
changing magnetic fields

A

Faraday’s law of induction

55
Q

Voltage induced by a changing magnetic flux

A

induced emf

56
Q

current produced during electromagnetic induction

A

induced current

57
Q

A generator that produces unidirectional current

A

DC generator

58
Q

also called alternator, produces alternating current

A

AC generator

59
Q

3-wire, 3-phase system will deliver how many times as much power as a 2-wire, single-phase system?

A

1.73 times

60
Q

A device that transfers energy from one electric circuit to another without change in frequency and usually (but not always) with a change in voltage.

A

Transformer

61
Q

The primary winding has more turns than the secondary.

A

Step-up transformer

62
Q

The primary winding has fewer turns than the secondary.

A

Step-down transformer

63
Q

States that the induced voltage in a coil is always in a direction so as to oppose the effect which is producing it.

A

Lenz’s law

64
Q

Refers to the portion of electric conductors that extends from the service entrance to an outlet or a certain group of outlets.

A

Branch circuit

65
Q

Type of branch circuit for table lamps, radios, television and other portable appliances.

A

Lighting and general-purpose circuits

66
Q

Type of branch circuit for portable appliances in the kitchen, dining area and laundry.

A

Small appliance circuits

67
Q

Type of branch circuit for ranges, air conditioners, water heaters, water pumps, furnaces, and dishwashers.

A

Special purpose circuits

68
Q

Electrical conductors which are 8 mm2 (AWG No. 8) or smaller in size.

A

Wires

69
Q

Electrical conductors which are larger than the wires.

A

Cables

70
Q

Meaning of AWG

A

American Wire Gauge

71
Q

1 mil is equal to how many inches?

A

0.001 in

72
Q

It is useless for many actual calculations involving true area.

A

circular mil

73
Q

Grounding of current-carrying portions of a system

A

System grounding

74
Q

Grounding of equipment not intended to be at a voltage potential different from the earth

A

Equipment grounding

75
Q

What is he resistance of the human body when dry?

A

about 500,000 Ω

76
Q

What is he resistance of the human body when wet?

A

about 300 Ω

77
Q

Amount of voltage can cause sufficient current to be fatal

A

30 V

78
Q

the use of colors of conductor covers in the wiring connections

A

Polarizing

79
Q

It is always the ‘neutral wire’

A

White wire

80
Q

‘hot’ conductors

A

Red or black wires

81
Q

Grounding wire

A

Green wire

82
Q

Overcurrent devices of which a portion is destroyed when interrupting the circuit

A

Fuses

83
Q

Device designed to open a circuit automatically on a
predetermined overload current without damage to itself

A

circuit breaker

84
Q

The best location for indoor type distribution center

A

Position closest to the
equipment having the largest wattage rating

85
Q

The best location for outdoor type distribution center

A

Nearest to the
electrical load center

86
Q

The best location for pole type distribution center

A

located at the electrical load center of the
farmstead

87
Q

Three criteria to consider for the selection of wires for feeder lines

A

(a) size to carry current.

(b) size of wire to prevent excessive
voltage drop (Allowable voltage drop = 2%).

(c) type and location adapted to
surroundings

88
Q

It constitutes only a small portion of the electromagnetic spectrum

A

Light

89
Q

It involves the procedure of dividing the room into zones.

A

zonal cavity method

PSAEIV-ABE BRM (9 decks)

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