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Perguntas do quiz (125)
1According to Kirchhoff's voltage law, adding up all of the voltage drops around any DC-circuit closed loop will give you the value of the applied voltage.
- AVerdadeiro
- BFalso
2An open resistor will have zero resistance.
- AVerdadeiro
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3According to Kirchhoff's current law, the amount of current leaving a junction is always less than the amount of current entering the junction.
- AVerdadeiro
- BFalso
4Kirchhoff's current law states:
- Aa. that the sum of the current that flows through each of the loads in a series circuit equals the total current.
- Bb. that the current flow in a circuit is directly proportional to the resistance and inversely proportional to the voltage.
- Cc. that the current entering any point in a circuit is equal to the current leaving that point.
- Dd. that the current is the same in all parts of a parallel circuit
5Kirchhoff's voltage law states:
- Aa. that around any closed loop in an electrical circuit, the sum of the voltage drops is equal to the applied voltage.
- B. that the voltage in a circuit varies directly as the resistance varies.
- C. that the voltage in a circuit is directly proportional to the resistance and inversely proportional to the current.
- D. that the product of all the voltages in a circuit is equal to zero.
6A shorted resistor will have infinite resistance.
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7The flow of electrons in a circuit is called an electric ___________.
- Acurrent
- Bsurge
- Crating
- Dcharge
8An electric toaster is rated for 120 V and 10 A. Its power rating would be :
- A1200W
- B1200Wh
9The ohmmeter is an instrument used to measure:
- Acurrent
- Bresistance
- Cvoltage
- Denergy
10Electrical conductors:
- Aa. all of these
- Bb. use most of the energy available from the source.
- Cc. complete the electron path from the source to the load.
- Dd. have high resistance
11The faster a lamp converts electrical energy to light, the brighter the lamp and the lower the wattage rating.
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12Energy measurements are used in calculating the cost of electrical energy.
- AVerdadeiro
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13The Greek symbol Ω (omega) is often used to represent ____________.
- Aohms
- Bresistance
- Ccurrent
- Dvolts
14Resistance is the opposition to the flow of electrons.
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15Conventional current flow is opposite in direction to electron flow.
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16Power is equal to voltage multiplied by resistance
- AVerdadeiro
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17An electric dryer rated for 3000 W is operated for 5 hours. The amount of energy used or converted is:
- A. 15,000 Wh.
- B5kwh
- C5wh
- D15000000 kwh
18Resistance is electrical pressure that causes electron flow in a circuit.
- AVerdadeiro
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19Which of the following is an example of a load?
- Aan electrical wall outlet
- Ba pushbutton
- Cextension cord
- Da hair dryer
20Technician A says that when taking measurements with a voltmeter and an ammeter, the meters are both connected into the circuit in the same way. Technician B says the voltmeter is connected in series and the ammeter is connected in parallel. Who is correct?
- Atech. A only
- Btech. B only
- Cneither
- Dboth
21An ampere is equivalent to:
- Aone joule per second
- Bone joule per minute
- Cone coloumb per second
- Done ohm per second
22An ohmmeter is the instrument used to measure current flow.
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23A switch would be classified as:
- Acontrol device
- Bvoltage source
- Cprotection device
- Dload device
24Electron flow indicates the flow of current from negative to positive.
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25An ammeter is connected in ____________ and a voltmeter is connected in _____________.
- Aparallel,parallel
- Bseries, parallel
- Cparallel,series
- Dseries,series
26If the resistance of a circuit is higher than normal and the voltage is normal, the current will be lower than normal.
- AVerdadeiro
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27If 10 V is applied, in turn, to a 50-Ω resistor and a 100-Ω resistor, the current flow will be:
- Aa. directly proportional to the resistance.
- Bb. the same through both resistors.
- Cc. greater through the 50-Ω resistor.
- Dd. greater through the 100-Ω resistor.
28According to Ohm's law, the current flowing in a circuit is directly proportional to the applied _____________ and inversely proportional to the ______________.
- Aa. amperage, resistance
- Bb. resitance, voltage
- Cc. voltage, resistance
- Dd. resistance, amperage
29Electric energy can be measured in:
- Akillowatt hours
- Bjoules
- Cwatthours
- Dall of these
30In a basic electrical circuit, the part that stores electric energy or changes it into other forms is:
- Athe switch
- Bthe source
- Cthe conductors
- Dthe load
31Which of the following is an example of a voltage source?
- Aswitch
- Blight bulb
- Cbattery
- Dcopper wire conductors
32The coulomb is a unit of electrical charge.
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33The unit of measurement for the difference of potential between two point is:
- Athe PD
- Bthe ohm
- Cthe volt
- Dthe amp
34If the source voltage is too low, the current will be low.
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35A ciruit is said to be open when there is a complete electric path from one side of the voltage source to the other.
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36The symbol used to represent current is:
- AP
- BV
- CI
- DR
37Other factors remaining constant, what would the effect on current flow be in a given circuit if the applied voltage were doubled?
- A. it would remain the same
- Bit would double
- Cbe divided by 4
- Dbe divided by 2
38Electric energy used in homes is measured using:
- Aohmmeter
- Bammeter
- Cvoltmeter
- Dkilowatthour meter
39The force that causes the flow of electrons through a conductor is known as:
- Avoltage
- Bcurrent
- Cpower
- Dresistance
40Which of the following is classified as a protective device?
- Acircuit breaker
- Bpushbutton
- Cfuse
- Dboth fuse and circuit breaker
41In a series circuit, the ____________ voltage is equal to the ____________ of the voltage drops across all the loads in the circuit.
- Asource,highest
- Bsource,sum
- Clowest,lowest
- Dhighest,lowest
42There is the same amount of ___________ in all parts of a series.
- Apolarity
- Bvoltage
- Cresistance
- Dcurrent
43Two voltage sources are connected in series-opposing. Technician A says the two voltages are added to obtain the total eqivalent voltage. Technician B says the equivalent voltage is given the polarity of the greater voltage. Who is correct?
- Atechnician a only
- Btechnician b only
- Cneither
- Dboth
44In a series circuit, the amount of voltage each load recieves is:
- A. determined by its position in the series string.
- B. directly proportional to the resistance value of each load.
- Cinversely proportional to the resistance value of each load.
- Dthe same as the applied voltage.
45The voltage across an open component in a series circuit is always equal to:
- Athe lowest circuit voltage
- Bsource voltage
- Cdropped voltage
- Dzero
46A series circuit has:
- A. three pathways for current flow.
- B. two pathways for current flow.
- Cas many pathways for current flow as there are loads connected in series.
- Done pathway for current flow.
47If one of the resistors in a series circuit becomes shorted, the voltage across all other series resistors:
- Aincreases
- Bdecreases
- Cremains the same
- Ddrops to zero
48The total power dissipation in a series circuit is equal to the source voltage multiplied by the ______________.
- Acurrent
- Bnumber of loads
- Cnumber of resistors
- Dresistance
49Three resistors with values of 1 kΩ, 5 kΩ, and 3 kΩ, respectively, are connected in series with a fourth resistor of unknown value. The applied voltage is 120 V and the current flow is 5 mA. What is the resistance value of the unknown resistor?
- A15kohms
- B3kohms
- C7kohms
- D1.75kohms
50What is the total current of a series circuit that has a source voltage of 24 V and the following resistors: 1 kΩ, 5 kΩ, and 2 kΩ?
- A3mA
- B4mA
- C12mA
- D6.2mA
51The total resistance of a series circuit is equal to the ______________ of all the resistances in the circuit.
- Asum
- Bmajority
- Chighest
- Dlowest
52A string of 12 holiday lamps is designed to be connected in series to a 120-V source. The voltage rating of each lamp should be:
- A10v
- B60v
- C120v
- D15v
53The total resistance of a series circuit:
- Aa. is the sum of all the individual load resistances
- B. increases as more loads are connected in series and is the sum of all the individual load resistances.
- C. decreases as more loads are connected in series.
- Dincreases as more loads are connected in series.
54Technician A says that in a series network of resistors, when a short occurs, the power that must be dissipated by all other resistors increases. Technician B says when a short occurs, current flow in the circuit increases. Who is correct?
- Aboth
- Bneither
- Ca
- Db
55The total resistance of an open series string is:
- Alower than normal
- Binfinate
- Czero
- Dnormal
56Which resistor of a series circuit recieves the largest voltage drop?
- Athe last resistor in the string
- B. the first resistor in the string
- Cc. the one with the least resistance
- D. the one with the most resistance
57How much resistance R1 must be added in series with a 400-Ω R2 to limit the current to 0.25 A with 120 V applied?
- A80ohms
- B200ohms
- C50ohms
- D100ohms
58A string of twelve holiday lamps is designed to be connected in series to a 120-V source. If one of the lamps burned out and was shorted from the circuit, the operating voltage across each of the other eleven lamps would be:
- A10.9v
- B14
- C20
- D45
59Resistors R1 - 8 kΩ, R2 - 4 kΩ, R3 - 6 kΩ, and R4 - 2 kΩ are connected in series to a voltage source. Which resistor will dissipate the most power?
- AR1
- BR2
- CR4
- DR3
60If a resistor is operated above its rated wattage, it will overheat and burn out.
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61The polarity of the voltage drop across a resistor depends on:
- Athe direction of current flow through it.
- B. its position in the circuit
- Cits resistance
- Dall of these
62Three resistors (R1, R2, and R3) are connected in series to a 120-V source. The values of V1 and V3 are measured and found to be 42 V and 8 V, respectively. The value of V2 would then be:
- A70v
- B24v
- C10v
- D100v
63If the common-ground refernce point is connected to the negative terminal of the source voltage, all voltages in the circuit with respect to the ground are:
- Aneutral
- Bpositive
- Cnegative
- Deither positive or negative
64Series-aiding voltage sources are connected so that the positive terminal of one voltage source is connected to:
- A. the common negative-ground reference point
- Bthe common positive-ground refernce point
- C. the negative terminal of the other voltage source
- Dthe positive terminal of the other voltage source.
65Which of the following electrical diagrams is the easiest to read?
- Aschematic
- Bperspective
- Cpictoral
- Dblock
66Three identical lamps are connected in parallel to a 6-V source. The voltage across each lamp would be:
- A2v
- B6v
- C3v
- D8v
67A fuse is used to:
- Aprotect circuit wiring and equipment
- Bautomatically open the circuit when a higher current flows
- C. allow only currents within safe limits to flow.
- Dall of these
68A control device is usually included in the circuit to all you to easily _______________, ________________, or _________________ the electron flow.
- Astart,stop,vary
- B. start, increase, double
- Cstart,stop,lock out
- Dstop,impeded,ruduced
69The higher the resistance of the load connected in series, the more voltage is received.
- AVerdadeiro
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70Technician A says each block of a block diagram shows the individual components of the circuit. Technician B says the arrows connecting the blocks of a diagram indicate the general direction of current paths. Who is correct?
- Ab
- Ba
- Cboth
- Dneither
71Normally the current flow into a lamp is the same as the current flow out of the lamp.
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72The amount of current each load in parallel passes is ______________ proportional to its resistance value.
- Ainversely
- Bdirectly
- Cnot
- Dreltativly
73Breadboarding refers to
- Abuilding a temporary version of a circuit
- Bbuilding a permanent version of a circuit
- Crepairing
- Dtroubleshooting
74There is the same amount of ______________ in all parts of a series circuit.
- Acurrent
- Bpolarity
- Cload
- Dresistance
75Which of the following electrical diagrams is impractical for complex circuits?
- Apictoral
- Bperspective
- Cschematic
- Dwiring
76All loads in a parallel circuit receive the same amount of voltage.
- AVerdadeiro
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77A single_______________ is usually used to measure voltage, current, and resistance.
- Amultimeter
- Bammeter
- Cvoltmeter
- Dohmmeter
78The lower the body resistance, the greater the potential electric shock hazard.
- AVerdadeiro
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79When replacing a hacksaw blade you must:
- A. Mount the blade with its teeth slanting away from the handle
- B. Mount the blade with its teeth slanting toward the handle.
- Cwear eye wear
- Dwear hand wear
80never use water to put out electrical fires.
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81A continuity tester is used for checking the continuity of dead circuits.
- AVerdadeiro
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82Exposed parts or pulleys:
- Aorange
- Bblue
- Cyellow
- Dwhite
83designed with jaws that can be locked onto the object:
- Avise grip
- Bside cutting
- Cdiagonal cutting
- Dneedle nose
84If your car hits a power line pole and dislodges wires, it is safe to exit the car immediately.
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85designed specifically for cutting wire:
- Adiagonal cutting
- Bside cutting
- Cneedle nose
- Dvise grip
86Replacing a fuse with one of a higher current rating can cause:
- Alights to flicker
- Bwires to overheat
- Call of these
- Dshort circuit
87As a general rule, higher-quality tools put less stress on the tool and the operator.
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88It is wise to turn off the main electric switch:
- Aduring a storm
- Bwhen changing light bulbs
- CWhen replacing switches and outlets
- Dall of these
89The amount of current flowing through a body is equal to:
- Avoltage x resistance
- Bvoltage/resistance
- Cpower/resistance
- Dpower x resistance
90Carbon dioxide or dry chemical types of fire extinguishers should be used to put out electrical fires.
- AVerdadeiro
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91A clip-on ammeter can measure current without any direct electric contact with the circuit.
- AVerdadeiro
- BFalso
92Location of first-aid equipment:
- Ayellow
- Bblue
- Cred
- Dgreen
93Screw anchors are used when fastening to wooden surfaces.
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94Energized electrical equipment is classified as a Class ___________________fire.
- Aa
- Bb
- Cc
- Dd
95The three electrical factors involved in an electric shock are:voltage, current, resistance
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96Whenever maximum compression between two metal surfaces is required a ____________ thread nut and bolt is used.
- Acoarse
- Bfine
- Clong
- Dshort
97Radiation hazards:
- Ablack
- Borange
- Cgreen
- Dpurple
98Acceptable grounded power tools with two-pronged plugs use single insulation to provide ground protection.
- AVerdadeiro
- BFalso
99Fire-protection equipment:
- Ablue
- Byellow
- Cred
- Dwhite
100A voltage tester is ideally suited for reading accurate voltage measurements.
- AVerdadeiro
- BFalso
101The current flow in a house branch circuit is to be checked to determine if it is within the rated capacity of the circuit. The instrument best suited for this test would be:
- Akilowatthour meter
- Bneon light meter
- Cvoltmeter
- Dclip on ammeter
102Caution against starting, using, or moving equipment under repair:
- Ayellow
- Bred
- Cblue
- Dpurple
103Which of the following can be used to provide information about the shape of a voltage waveform?
- Aoscilloscope
- Bvoltmeter
- Cammeter
- Dmultimeter
104Generally, any voltage above ______V is considered dangerous.
- A30
- B10
- C5
105If a fuse blows often, replace it with one of a higher ampere rating
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106what AWG would be used for a 30A- dryer
- A10
- B20
- C14
- D00
107no 12 AWG copper would be rated for ________ current than 12 AWG aluminum wire?
- Amore
- Bless
108motor winding conductors often use
- Aneoprene
- Bbaked on enamel
- CTWH insulation
- DTw insulation
109neoprene insulation is most often used for
- Aheat producing appliances
- Bextension cords
- Cmotors
- Dlamps
110as the AWG number of wire increases, the diameter of wire
- Aincreases
- Bdecreases
111the type of conductor form used for permanent house building is;
- Acord
- Bhook-up wire
- Ccable
- Dprinted circuit
112high voltage drops are more likely to occur when the load is located some distance from the voltage source
- AVerdadeiro
- BFalso
113what AWG wire would be used for a 40A range recepticle
- A8
- B10
- C000
114the circular mil area of a round wire is found by _______ the diameter of wire expressed in mils.
- Asquaring
- Btrippling
- Chalving
115by using ohms law we can predict what is going to happen in the circuit before we wire it.
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116power is the amount of work performed by an electric circuit
- AVerdadeiro
- BFalso
117a 470 000 ohm resistor is
- A47kohm
- B470kohm
- C47Mohm
- D4.7Mohm
118ohms law states that current is directly proportional to the voltage, and inversely proportional to the resistance.
- AVerdadeiro
- BFalso
119what is larger
- Aohm
- Bkilohm
120in a parallel circuit with an open branch, the total current decreases
- AVerdadeiro
- BFalso
121adding parallel branches to the circuit always
- Adecreases total conductance
- Bincreases total resistance
- Cdecreases total resistance
- Ddecreases total current
122with 24v applied across 6 5ohm resistors the total current is
- A20A
- B5A
- C17A
123with resistances of 50ohms, 100ohms, 1.4kohms, and 1Mohm RT is
- Aless than 50 ohms
- Bmore than 1Mohm
124the total current in a parallel circuit is equal to the sum of the individual currents
- AVerdadeiro
- BFalso
125the total resistance of a parallel circuit is always lower than the branch with the lowest resistance
- AVerdadeiro
- BFalso
Informações
- Descrição
- Quiz sobre Sem título, criado por brandon vautour em 03-03-2015.
- Autor
- brandon vautour
- Idioma
- English
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