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Electricity SHOCK > A-D > Flashcards

A-D Flashcards

1
Q

Electrons and Protons:

flow in alternating directions.
attract each other.
are both transferred during current flow.
repel each other.

A

attract each other.

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2
Q

Copper is described as a conductor because it has:

less than three electrons in it’s outer shell.

more than five (5) electrons in it’s outer shell.

no electrons in it’s outer shell.

it’s outer shell full of electrons.

A

less than three electrons in it’s outer shell.

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3
Q

The best insulator has:

it’s outer shell full of electrons.

more than five (5) electrons in it’s outer shell.

less than three (3) electrons in it’s outer shell.

no outer shell.

A

more than five (5) electrons in it’s outer shell.

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4
Q

Ohms Law states that:

it takes 1 volt of pressure to cause 1 amp of current to flow through 1 ohm of resistance.

Ohms law strictly refers to resistance not voltage and amperage.

it takes 1 volt of current to cause 1 amp of pressure to flow through 1 ohm of resistance.

none of these options are correct

A

it takes 1 volt of pressure to cause 1 amp of current to flow through 1 ohm of resistance.

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5
Q

When transposing Ohms Law to solve for resistance, the formula is:

R = E / I

R = I / E

R = I x E

None of these options are correct.

A

R = E / I

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6
Q

Electricity can be generated by the following processes except:

chemical energy

static.

induction

reduction

A

reduction

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7
Q

I measured circuit amperage using my DMM between the fuse and the switch, between my two loads and also where my ground wire fastens to the frame. the reading that I measured was consistent at all three locations. I have a:

parallel circuit

short circuit

series circuit

series - parallel circuit

A

series circuit

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8
Q

When measuring in a circuit I saw three (3) different amperage readings and two different voltage readings. I did not take any resistance readings. This must be a:

series - parallel circuit

series circuit.

based on the information supplied it could either be a parallel or a series - parallel circuit, I can’t tell which.

parallel

A

series - parallel circuit

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9
Q

As the temperature of a copper conductor decreases and the voltage remains the same, the current will:

remain unchanged

increase

decrease

fluctuate

A

increase

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10
Q

To properly connect the ammeter into the circuit:

be sure to connect in line with the circuit closed.

connect in parallel provided that the current is flowing and the load is operating.

connect in series and be sure the current is flowing and the circuit is closed.

make a shunted connection to protect the circuit as you take the test.

A

connect in series and be sure the current is flowing and the circuit is closed.

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11
Q

To properly connect the voltmeter into the circuit:

don’t make a parallel connection, the extra branch in parallel will lower circuit resistance and damage the circuit.

make a series connection in an energized circuit.

Correct Answer
make a parallel connection in an energized circuit

make a parallel connection in a de-energized circuit.

A

make a parallel connection in an energized circuit

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12
Q

When current flowing in a coiled wire is stopped:

shared induction occurs.

the right hand rule for coils no longer applies.

The magnetic flux lines will invert.

the magnetic field will collapse due to loss of amperage.

A

the magnetic field will collapse due to loss of amperage.

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13
Q

Voltage is induced in a conductor when magnetic field:

has no movement relative to the conductor.

moves around a conductor.

moves through conductor.

is oriented in parallel with a conductor.

A

Correct Answer
moves through conductor.

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14
Q

The following listed material with the lowest permeability is:

Aluminum

nickel

cobalt

steel

A

Aluminum

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15
Q

A permanent magnet loses magnetic strength when:

all of these answers are possible.

exposed to shock.

exposed to a DC magnetic field.

cooled.

A

exposed to shock.

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16
Q

A good conductor offers___________________ resistance to a circuit and this in turn requires___________________ voltage to keep the current constant.

less, more.

more, more.

more, less.

less, less.

A

less, less.

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17
Q

When one lamp in an electrical lighting circuit burns dimly when compared to the other lamps in the same circuit the probable cause is:

an open.

a short.

high resistance.

a ground fault.

A

Correct Answer
high resistance.

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18
Q

An incandescent light bulb in a circuit may:

all the supplied options are possible.

produce light.

limit current flow in the circuit.

produce heat.

A

all the supplied options are possible.

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19
Q

A 12 gauge wire will be able to safely conduct less current than a 16 gauge wire.

True
False
A

Correct Answer
True

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20
Q

Which of these statements is true of a 6 volt automotive battery?

It has 3 cells connected in parallel.

It has 3 cells connected in series.

it has 6 cells connected in parallel.

It has 6 cells connected in series.

A

It has 3 cells connected in series.

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21
Q

What usually causes a fuse to “blow”?

Too much resistance.

Too little resistance.

Too much voltage.

Too little voltage.

A

Too little resistance.

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22
Q

An ammeter with an inductive clamp is connected in ______________ with an energized circuit when measuring current flow.

none of these options is correct.

Series-parallel

Parallel

Series

A

Correct Answer
none of these options is correct.

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23
Q

An ohm meter reading of 2.4 MΩ would be expressed as:

0.000 0024 ohms

0.0024 ohms

2 400 000 ohms

2 400 ohms

A

2 400 000 ohms

24
Q

An unintended ground in a circuit may cause the fuse to “blow”. The cause might be:

excessive amperage in the circuit.

excessive voltage flowing in the circuit

the circuit is fine, the fuse is rated to handle this occurrence

excessive resistance in the circuit

A

excessive amperage in the circuit.

25
Q

An ammeter reading of 0.025 amps could be expressed as:

250 mA

25 mA

0.25 mA

2.5 mA

A

25 mA

26
Q

Reduced current flow in a circuit can be caused by:

the solenoid coil being shorted.

a clean break in a conductor.

operator error.

corroded ground terminal on the battery.

A

corroded ground terminal on the battery.

27
Q

A fundamental law of electricity is that current in a circuit:

will increase as voltage increases

will increase as resistance increases

will equal voltage in the circuit

will decrease as voltage increases

A

will increase as voltage increases

28
Q

A material which has more than four electrons in its outer valence ring would be:

Wood

Aluminum

Copper

Silver

A

Wood

29
Q

When current in a circuit shows a sudden increase, this means that:

Voltage cannot change so resistance must have increased

Current took another path

voltage has dropped or resistance has increased

Voltage has increased or resistance has dropped

A

Correct Answer
Voltage has increased or resistance has dropped

30
Q

A series circuit with four (4) loads in it has a resistor that is in a shorted condition. The measurable current flow in the circuit will be:

unchanged

lower than normal

no current flow will be present

Higher than normal

A

Higher than normal

31
Q

A solenoid coil has a specification of 24Ω to 27Ω based on the manufacturers supplied information. You measure its value and find a reading of 10Ω. The coil is:

normal considering that the coil is not flowing current

grounded through the case

open

shorted

A

shorted

32
Q

Which voltmeter will read the highest and which will read the lowest?

It depends on how much current is flowing in the circuit

V3 highest and V1 lowest

V1 highest and V2 lowest

V1 highest and V3 lowest

A

V1 highest and V3 lowest

33
Q

What will the voltmeters read in the above diagram?

V1 - 0v, V2 - 10.2v, V3 - 0.8v

V1 - 0v, V2 - 6v, V3 - 6v

V1 - 12v, V2 - 12v, V3 - 0v

V1 - 0v, V2 - 0v, V3 - 12v

A

V1 - 12v, V2 - 12v, V3 - 0v

34
Q

What will the voltmeters in the above diagram read?

V1 - 0v, V2 - 0v, V3 - 0v

v1 - 12v, V2 - 0v, V3 - 0v

V1 - 12v, V2 - 12v, V3 - 0v

V1 - 12v, V2 - 0v, V3 - 12v

A

V1 - 12v, V2 - 0v, V3 - 12v

35
Q

How many amps run through a 12Volt parallel circuit with 14 Ω total resistance?

1.2A

14mA

857mA

85.7mA

A

857mA

36
Q

The factors that contribute to the amount of voltage induced in a system are:

speed of intersection, intersecting angle, magnetic field strength, polarity

intersecting angle, speed of intersection, polarity, permeability

permeability, number of conductors, intersecting angle, magnetic field strength

speed of intersection, intersecting angle, magnetic field strength, number of conductors

A

speed of intersection, intersecting angle, magnetic field strength, number of conductors

37
Q

A turns ratio of 6:1 :

would have a primary winding with seventy two (72) turns and a secondary winding with twelve (12) turns

would have a primary winding with six (6)turns and a secondary winding with one (1) turn

The ability to increase voltage generated by six (6%) percent

would have a primary winding with sixty six (66) turns and a secondary winding with three hundred and ninety six (396) turns

A

Correct Answer
would have a primary winding with sixty six (66) turns and a secondary winding with three hundred and ninety six (396) turns

38
Q

The correct method for connecting the following test equipment is:

voltmeter in series, ohmmeter in parallel, ammeter in series, amp clamp on the ground side wiring

voltmeter in series, ammeter in parallel, ohmmeter separated from the circuit, amp clamp around the wiring harness

voltmeter in parallel, ohmmeter in series in the circuit, ammeter in series, amp clamp on the supply side wiring

voltmeter in parallel, ammeter in series, ohmmeter separated from the circuit, amp clamp with the arrow pointing to the batteries negative terminal

A

voltmeter in parallel, ammeter in series, ohmmeter separated from the circuit, amp clamp with the arrow pointing to the batteries negative terminal

39
Q

In the image shown with engine cranking and inductive clamp connected to meter:

the measured value is 108 volts

the measured value is 108 Ω

the measured value is 108 A

the measured value is 108 mA

A

Correct Answer
the measured value is 108 A

40
Q

With reference to the diagram below with a source voltage of 12.6V:

The lamp in the circuit above glows dimly. A circuit tester as shown indicates 12.6v just before the lamp. Technician “A” says that a bad ground at the lamp could be the cause. Technician “B” says that high resistance in the circuit from the battery to the lamp could be the cause. Who is correct?

A

technician A

41
Q

When two or more electrical circuits operate abnormally at the same time the probable cause is

a short

an open

an unwanted high resistance

a ground fault

A

a short

42
Q

The coil in a relay is used to open and close a

circuit breaker

fuse

switch

conduit

A

switch

43
Q

R1=10ohms, R2=10ohms, R3=20ohms

What is the total resistance of the circuit?

4ohms

40ohms

0.025ohms

0.25ohms

A

4ohms

44
Q

As the AWG number gets larger the wire diameter increases

True
False
A

False

45
Q

Acid core wire is not used in electrical wiring

True
False
A

True

46
Q

A “OL “ reading on a ohm meter when testing a fuse indicates a good fuse

True
False
A

False

47
Q

Special tools are needed to repair weatherproof connectors

True
False
A

True

48
Q

Replace fuses with higher rated fuses to prevent circuit failures

True
False
A

False

49
Q

Non cycling circuit breakers are used in head light circuits

True
False
A

False

50
Q

A 12 volt drop over a fusible link would indicate a faulty link

True
False
A

True

51
Q

A switch with a high resistance in the closed position would indicate

a good switch

True
False
A

False

52
Q

When 2 or more circuits are operating abnormally the probable cause is a open

True
False
A

False

53
Q

An unwanted high resistance would increase current flow

True
False
A

False

54
Q

Voltage is applied to the coil. What should the resistance be between terminal 30 and 87a ________Ω

O.L.

0 ohms

30 ohms

85 ohms

A

O.L

55
Q

Voltage is applied to the coil. What should the resistance be between terminal 30 and 87 ________Ω

O.L.

0 ohms

30 ohms

87 ohms

A

0ohms

Electricity SHOCK (2 decks)

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