A-D Flashcards
Electrons and Protons:
flow in alternating directions.
attract each other.
are both transferred during current flow.
repel each other.
attract each other.
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.
less than three electrons in it’s outer shell.
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.
more than five (5) electrons in it’s outer shell.
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
it takes 1 volt of pressure to cause 1 amp of current to flow through 1 ohm of resistance.
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.
R = E / I
Electricity can be generated by the following processes except:
chemical energy
static.
induction
reduction
reduction
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
series circuit
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
series - parallel circuit
As the temperature of a copper conductor decreases and the voltage remains the same, the current will:
remain unchanged
increase
decrease
fluctuate
increase
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.
connect in series and be sure the current is flowing and the circuit is closed.
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.
make a parallel connection in an energized circuit
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.
the magnetic field will collapse due to loss of amperage.
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.
Correct Answer
moves through conductor.
The following listed material with the lowest permeability is:
Aluminum
nickel
cobalt
steel
Aluminum
A permanent magnet loses magnetic strength when:
all of these answers are possible.
exposed to shock.
exposed to a DC magnetic field.
cooled.
exposed to shock.
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.
less, less.
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.
Correct Answer
high resistance.
An incandescent light bulb in a circuit may:
all the supplied options are possible.
produce light.
limit current flow in the circuit.
produce heat.
all the supplied options are possible.
A 12 gauge wire will be able to safely conduct less current than a 16 gauge wire.
True False
Correct Answer
True
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.
It has 3 cells connected in series.
What usually causes a fuse to “blow”?
Too much resistance.
Too little resistance.
Too much voltage.
Too little voltage.
Too little resistance.
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
Correct Answer
none of these options is correct.
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
2 400 000 ohms
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
excessive amperage in the circuit.
An ammeter reading of 0.025 amps could be expressed as:
250 mA
25 mA
0.25 mA
2.5 mA
25 mA
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.
corroded ground terminal on the battery.
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
will increase as voltage increases
A material which has more than four electrons in its outer valence ring would be:
Wood
Aluminum
Copper
Silver
Wood
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
Correct Answer
Voltage has increased or resistance has dropped
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
Higher than normal
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
shorted
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
V1 highest and V3 lowest
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
V1 - 12v, V2 - 12v, V3 - 0v
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
V1 - 12v, V2 - 0v, V3 - 12v
How many amps run through a 12Volt parallel circuit with 14 Ω total resistance?
1.2A
14mA
857mA
85.7mA
857mA
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
speed of intersection, intersecting angle, magnetic field strength, number of conductors
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
Correct Answer
would have a primary winding with sixty six (66) turns and a secondary winding with three hundred and ninety six (396) turns
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
voltmeter in parallel, ammeter in series, ohmmeter separated from the circuit, amp clamp with the arrow pointing to the batteries negative terminal
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
Correct Answer
the measured value is 108 A
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?
technician A
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 short
The coil in a relay is used to open and close a
circuit breaker
fuse
switch
conduit
switch
R1=10ohms, R2=10ohms, R3=20ohms
What is the total resistance of the circuit?
4ohms
40ohms
0.025ohms
0.25ohms
4ohms
As the AWG number gets larger the wire diameter increases
True False
False
Acid core wire is not used in electrical wiring
True False
True
A “OL “ reading on a ohm meter when testing a fuse indicates a good fuse
True False
False
Special tools are needed to repair weatherproof connectors
True False
True
Replace fuses with higher rated fuses to prevent circuit failures
True False
False
Non cycling circuit breakers are used in head light circuits
True False
False
A 12 volt drop over a fusible link would indicate a faulty link
True False
True
A switch with a high resistance in the closed position would indicate
a good switch
True False
False
When 2 or more circuits are operating abnormally the probable cause is a open
True False
False
An unwanted high resistance would increase current flow
True False
False
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
O.L
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
0ohms
