Deck 7: Series-Parallel Circuits

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سؤال
A DC generator produces a smooth DC voltage output.
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سؤال
Permeability is ________.

A)the shielding effect of a material
B)the opposition to being magnetized
C)the ease of a material to be magnetized
D)the ability of a magnetic material to conduct a current
سؤال
Magnetic flux is another name for a magnetic field.
سؤال
The opposition to being magnetized is called permeability.
سؤال
If two north magnetic poles are brought close to each other, ________.

A)a force of repulsion pushes them apart
B)an electromagnet is created
C)a force of attraction pulls them together
D)a current is induced
سؤال
Unlike magnetic poles repulse one another.
سؤال
How does the magnetic field change around a conducting wire if the current increases?

A)The field grows stronger.
B)The field grows weaker.
C)It is impossible to predict.
D)There is no magnetic field around a conducting wire.
سؤال
A magnetic field around a conductor is a good indication that current is flowing.
سؤال
A conductor with no current through it will still have a magnetic field around it.
سؤال
The speed of movement of the coil of a generator affects the direction of current produced.
سؤال
A coil of wire with current flowing through it is called a(n) ________.

A)north pole
B)south pole
C)capacitor
D)electromagnet
سؤال
Soft iron, copper, and silver make good magnets.
سؤال
Aluminum, brass, and iron make good magnets.
سؤال
A strong magnetic field around a conductor indicates a small current flowing through the
conductor.
سؤال
Two north magnetic poles attract one another.
سؤال
A solenoid consists of ________.

A)a coil of wire wound around a core
B)a permanent magnet
C)a burglar alarm relay
D)two plates separated by an insulator
سؤال
The left-hand rule can be used to determine the amount of magnetomotive force.
سؤال
Flux lines are concentrated at the center of a magnet.
سؤال
A permanent magnet will retain its magnetism for a long period of time.
سؤال
A solenoid converts electrical energy into mechanical energy.
سؤال
The magnetic field around an electromagnet is produced by ________.

A)a current flowing through the winding
B)the conductorʹs permeability
C)a permanent magnet
D)the laminated iron core
سؤال
If a basic one-loop, dc generator rotates at 60 revolutions each second, how many times each second does its dc output voltage reach a peak value?

A)240
B)0
C)60
D)120
سؤال
Unlike magnetic poles ________ and like poles ________.

A)attract, attract
B)repel, repel
C)attract, repel
D)repel, attract
سؤال
The term reluctance in magnetic circuits is like the term ________ in electrical circuits.

A)voltage
B)resistance
C)capacitance
D)current
سؤال
The voltage produced by a magnetic field cutting through a conductor depends on the ________.

A)direction of motion
B)length of the conductor
C)speed of motion
D)all of the above
سؤال
Which one of the statements below does NOT apply to the voltage induced into a wire when it is moved through a magnetic field?

A)It depends on the length of moving wire in the field.
B)It depends on the strength of the magnetic field.
C)It depends on the speed of wire motion.
D)It depends on the current flowing in the wire.
سؤال
The magnetic term that is equivalent to voltage is ________.

A)magnetomotive force
B)flux density
C)reluctance
D)current
سؤال
If a relay picks up and makes a contact but does not stay picked up, whatʹs the trouble?

A)The relay coil is open.
B)The magnetic field is too strong.
C)The magnetic field is too weak.
D)There is no trouble. The relay is operating normally.
سؤال
A weber is a unit of ________.

A)reluctance
B)permeability
C)magnetic flux
D)magnetomotive force
سؤال
If a tape recorderʹs output voltage increases and decreases when you shake the recorder, a possible problem might be ________.

A)too high a source voltage
B)an open circuit in the speaker
C)a loose circular magnet around the speakerʹs voice coil
D)an open capacitor
سؤال
If the contacts fail to open when a relay is de-energized, what is the trouble?

A)Dirt is causing the relay armature to stick.
B)There is too little current in the relay coil.
C)The return spring tension is too large.
D)There is no trouble. The relay is operating normally.
سؤال
The permeability of air is ________.

A)19.2
B)1
C)7
D)22
سؤال
A ________ is a type of electromagnetic device that has a movable iron core called a plunger.

A)analog meter
B)solenoid
C)relay
D)speaker
سؤال
How will two permanent bar magnets react if they are brought close to each other?

A)They will repel if the north and south poles are together.
B)They will attract if their south poles are together.
C)They will attract if the north and south poles are together.
D)They will attract if their north poles are together.
سؤال
According to the left-hand rule for the magnetic field around a conductor, what points in the direction of current flow?

A)meter
B)index finger
C)thumb
D)fingers
سؤال
The quantity of lines of force per unit of area is known as ________.

A)permeability
B)ampere-turns
C)flux density
D)magnetic flux
سؤال
If the cross-sectional area of a magnetic field decreases, the flux density ________.

A)remains the same
B)decreases
C)increases
سؤال
In which one of the following applications is electromagnetism used?

A)loudspeakers
B)tape recorders
C)relays
D)all of these
سؤال
A tesla is a unit of ________.

A)magnetomotive force
B)magnetic flux density
C)permeability
D)reluctance
سؤال
The polarity of an induced voltage depends on the ________.

A)length of a conductor in a magnetic field
B)time that the conductor remains stationary in a magnetic field
C)direction of motion of a conductor in a magnetic field
D)amount of current flowing
سؤال
A simple electric doorbell probably uses ________ to ring the bell.

A) <strong>A simple electric doorbell probably uses ________ to ring the bell.</strong> A)   switch B)an electromagnet C)transistor D)a permanent magnet <div style=padding-top: 35px> switch
B)an electromagnet
C)transistor
D)a permanent magnet
سؤال
An iron core electromagnet has a higher ________ than an air core electromagnet.

A)current
B)permeability
C)resistance
D)reactance
سؤال
The principal difference between a solenoid and a relay is that:

A)solenoids do electrical work, relays do mechanical work.
B)solenoids do mechanical work, relays do electrical work.
C)relays use magnets, solenoids do not.
D)relays relay electricity, solenoids do not.
سؤال
Soft iron has a high ________.

A)reactance
B)resistance
C)permeability
D)mmf
سؤال
Magnetic lines that are close to each other are said to have a high ________.

A)current
B)reluctance
C)flux density
D)inductance
سؤال
A relay is a device that ________.

A)isolates the actuating signal from the control signal
B)has a coil to actuate some contacts that control other circuits
C)uses an electromagnet to open and close contacts
D)all of these
سؤال
Applying an ac voltage to an electromagnetʹs coil will produce a ________.

A)south magnetic field
B)north magnetic field
C)steady magnet field
D)changing magnetic field
سؤال
The movable part of the solenoid is the:

A)the plunger.
B)magnetic field.
C)electromagnetic coil.
D)all of these.
سؤال
If some turns of wire are removed from an electromagnet, the magnetic field will ________.

A)be more than the original electromagnet
B)be the same as the original electromagnet
C)be less than the original electromagnet
سؤال
If more turns of wire are added to a coil and then that coil is moved through a magnetic field, the voltage produced will ________.

A)be the same as the original coil
B)be more than the original coil
C)be less than the original coil
سؤال
Like magnetic poles ________.

A)have the same current through them
B)attract each other
C)have no effect on each other
D)repel each other
سؤال
Electromagnetic induction is best defined as the process by which a voltage is produced in a conductor when there is:

A)energy produced by the rotating coils.
B)motion around the magnetic fields.
C)motion between the conductor and the magnetic field.
D)motion between the magnetic poles.
سؤال
The ________ electromagnet cannot be further magnetized.

A)open
B)shorted
C)saturated
D)capacitive
سؤال
The amount of voltage that is induced in a conductor depends on the ________.

A)direction of the current flowing
B)length of time a conductor remains stationary in the magnetic field
C)length of the conductor in the magnetic field
D)direction of motion of the conductor in the magnetic field
سؤال
Increasing the speed at which a magnet moves through a coil of wire causes the induced voltage to ________.

A)decrease
B)increase
C)remain the same
سؤال
Reversing the current through an electromagnet ________ the magnetic field.

A)collapses
B)reverses
C)increases
D)decreases
سؤال
If the number of turns of wire on an electromagnet increases, the magnetomotive force mmf ________.

A)remains the same
B)decreases
C)increases
سؤال
An <strong>An   is a unit of ________.</strong> A)magnetomotive force (mmf) B)permeability C)reactance D)resistance <div style=padding-top: 35px> is a unit of ________.

A)magnetomotive force (mmf)
B)permeability
C)reactance
D)resistance
سؤال
The movable part of the relay is the:

A)electromagnetic coil.
B)the armature.
C)magnetic field.
D)all of these.
سؤال
Hysteresis is a characteristic of magnetic materials wherein a change in magnetization:

A)occurs after the application of a magnetic force.
B)varies according to the current flow.
C)occurs exactly with the application of a magnetic force.
D)occurs before the application of a magnetizing force.
سؤال
Faradayʹs law states that the voltage induced across a coil of wire is proportional to these two factors.

A)the diameter of the conductor and the rate of change of the magnetic flux
B)the size of the coil and the rate of change of the magnetic flux
C)the number of turns in the coil and the rate of change of the magnetic flux
D)the size of the magnets and the rate of change of the magnetic flux
سؤال
For a high current switching application where it is not practical to route heavy wiring to the switch location which device would be used?

A)electromagnet
B)solenoid
C)relay
D)generator
سؤال
Induced voltage resulting from electromagnetic induction is proportional to:

A)the rate at which the conductor and magnetic fields move relative to each other.
B)the angle at which the conductor cuts the magnetic field.
C)the number of turns of wire in the coil.
D)all of these.
سؤال
The purpose of a commutator in a dc generator is to:

A)concentrate flux density.
B)provide filtration.
C)keep current flowing in one direction.
D)maximize the current generated.
سؤال
Faradayʹs law and Lenzʹs law are related in that they deal with:

A)an induced voltage.
B)a resulting current flow.
C)varying magnetic field.
D)all of these.
سؤال
If a higher voltage is needed from a generator, what must be done?

A)Increase the distance between the coil and magnetic field.
B)Turn the coil faster.
C)Decrease the number of coils.
D)both B and C.
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ملء الشاشة (f)
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Deck 7: Series-Parallel Circuits
1
A DC generator produces a smooth DC voltage output.
False
2
Permeability is ________.

A)the shielding effect of a material
B)the opposition to being magnetized
C)the ease of a material to be magnetized
D)the ability of a magnetic material to conduct a current
the ease of a material to be magnetized
3
Magnetic flux is another name for a magnetic field.
True
4
The opposition to being magnetized is called permeability.
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5
If two north magnetic poles are brought close to each other, ________.

A)a force of repulsion pushes them apart
B)an electromagnet is created
C)a force of attraction pulls them together
D)a current is induced
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6
Unlike magnetic poles repulse one another.
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7
How does the magnetic field change around a conducting wire if the current increases?

A)The field grows stronger.
B)The field grows weaker.
C)It is impossible to predict.
D)There is no magnetic field around a conducting wire.
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8
A magnetic field around a conductor is a good indication that current is flowing.
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9
A conductor with no current through it will still have a magnetic field around it.
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10
The speed of movement of the coil of a generator affects the direction of current produced.
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11
A coil of wire with current flowing through it is called a(n) ________.

A)north pole
B)south pole
C)capacitor
D)electromagnet
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12
Soft iron, copper, and silver make good magnets.
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13
Aluminum, brass, and iron make good magnets.
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14
A strong magnetic field around a conductor indicates a small current flowing through the
conductor.
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15
Two north magnetic poles attract one another.
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16
A solenoid consists of ________.

A)a coil of wire wound around a core
B)a permanent magnet
C)a burglar alarm relay
D)two plates separated by an insulator
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17
The left-hand rule can be used to determine the amount of magnetomotive force.
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18
Flux lines are concentrated at the center of a magnet.
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19
A permanent magnet will retain its magnetism for a long period of time.
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20
A solenoid converts electrical energy into mechanical energy.
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21
The magnetic field around an electromagnet is produced by ________.

A)a current flowing through the winding
B)the conductorʹs permeability
C)a permanent magnet
D)the laminated iron core
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22
If a basic one-loop, dc generator rotates at 60 revolutions each second, how many times each second does its dc output voltage reach a peak value?

A)240
B)0
C)60
D)120
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23
Unlike magnetic poles ________ and like poles ________.

A)attract, attract
B)repel, repel
C)attract, repel
D)repel, attract
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24
The term reluctance in magnetic circuits is like the term ________ in electrical circuits.

A)voltage
B)resistance
C)capacitance
D)current
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25
The voltage produced by a magnetic field cutting through a conductor depends on the ________.

A)direction of motion
B)length of the conductor
C)speed of motion
D)all of the above
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26
Which one of the statements below does NOT apply to the voltage induced into a wire when it is moved through a magnetic field?

A)It depends on the length of moving wire in the field.
B)It depends on the strength of the magnetic field.
C)It depends on the speed of wire motion.
D)It depends on the current flowing in the wire.
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27
The magnetic term that is equivalent to voltage is ________.

A)magnetomotive force
B)flux density
C)reluctance
D)current
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28
If a relay picks up and makes a contact but does not stay picked up, whatʹs the trouble?

A)The relay coil is open.
B)The magnetic field is too strong.
C)The magnetic field is too weak.
D)There is no trouble. The relay is operating normally.
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29
A weber is a unit of ________.

A)reluctance
B)permeability
C)magnetic flux
D)magnetomotive force
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30
If a tape recorderʹs output voltage increases and decreases when you shake the recorder, a possible problem might be ________.

A)too high a source voltage
B)an open circuit in the speaker
C)a loose circular magnet around the speakerʹs voice coil
D)an open capacitor
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31
If the contacts fail to open when a relay is de-energized, what is the trouble?

A)Dirt is causing the relay armature to stick.
B)There is too little current in the relay coil.
C)The return spring tension is too large.
D)There is no trouble. The relay is operating normally.
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32
The permeability of air is ________.

A)19.2
B)1
C)7
D)22
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33
A ________ is a type of electromagnetic device that has a movable iron core called a plunger.

A)analog meter
B)solenoid
C)relay
D)speaker
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34
How will two permanent bar magnets react if they are brought close to each other?

A)They will repel if the north and south poles are together.
B)They will attract if their south poles are together.
C)They will attract if the north and south poles are together.
D)They will attract if their north poles are together.
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35
According to the left-hand rule for the magnetic field around a conductor, what points in the direction of current flow?

A)meter
B)index finger
C)thumb
D)fingers
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36
The quantity of lines of force per unit of area is known as ________.

A)permeability
B)ampere-turns
C)flux density
D)magnetic flux
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37
If the cross-sectional area of a magnetic field decreases, the flux density ________.

A)remains the same
B)decreases
C)increases
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38
In which one of the following applications is electromagnetism used?

A)loudspeakers
B)tape recorders
C)relays
D)all of these
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39
A tesla is a unit of ________.

A)magnetomotive force
B)magnetic flux density
C)permeability
D)reluctance
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40
The polarity of an induced voltage depends on the ________.

A)length of a conductor in a magnetic field
B)time that the conductor remains stationary in a magnetic field
C)direction of motion of a conductor in a magnetic field
D)amount of current flowing
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41
A simple electric doorbell probably uses ________ to ring the bell.

A) <strong>A simple electric doorbell probably uses ________ to ring the bell.</strong> A)   switch B)an electromagnet C)transistor D)a permanent magnet switch
B)an electromagnet
C)transistor
D)a permanent magnet
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42
An iron core electromagnet has a higher ________ than an air core electromagnet.

A)current
B)permeability
C)resistance
D)reactance
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43
The principal difference between a solenoid and a relay is that:

A)solenoids do electrical work, relays do mechanical work.
B)solenoids do mechanical work, relays do electrical work.
C)relays use magnets, solenoids do not.
D)relays relay electricity, solenoids do not.
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44
Soft iron has a high ________.

A)reactance
B)resistance
C)permeability
D)mmf
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45
Magnetic lines that are close to each other are said to have a high ________.

A)current
B)reluctance
C)flux density
D)inductance
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46
A relay is a device that ________.

A)isolates the actuating signal from the control signal
B)has a coil to actuate some contacts that control other circuits
C)uses an electromagnet to open and close contacts
D)all of these
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47
Applying an ac voltage to an electromagnetʹs coil will produce a ________.

A)south magnetic field
B)north magnetic field
C)steady magnet field
D)changing magnetic field
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48
The movable part of the solenoid is the:

A)the plunger.
B)magnetic field.
C)electromagnetic coil.
D)all of these.
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49
If some turns of wire are removed from an electromagnet, the magnetic field will ________.

A)be more than the original electromagnet
B)be the same as the original electromagnet
C)be less than the original electromagnet
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50
If more turns of wire are added to a coil and then that coil is moved through a magnetic field, the voltage produced will ________.

A)be the same as the original coil
B)be more than the original coil
C)be less than the original coil
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51
Like magnetic poles ________.

A)have the same current through them
B)attract each other
C)have no effect on each other
D)repel each other
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52
Electromagnetic induction is best defined as the process by which a voltage is produced in a conductor when there is:

A)energy produced by the rotating coils.
B)motion around the magnetic fields.
C)motion between the conductor and the magnetic field.
D)motion between the magnetic poles.
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53
The ________ electromagnet cannot be further magnetized.

A)open
B)shorted
C)saturated
D)capacitive
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54
The amount of voltage that is induced in a conductor depends on the ________.

A)direction of the current flowing
B)length of time a conductor remains stationary in the magnetic field
C)length of the conductor in the magnetic field
D)direction of motion of the conductor in the magnetic field
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55
Increasing the speed at which a magnet moves through a coil of wire causes the induced voltage to ________.

A)decrease
B)increase
C)remain the same
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56
Reversing the current through an electromagnet ________ the magnetic field.

A)collapses
B)reverses
C)increases
D)decreases
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57
If the number of turns of wire on an electromagnet increases, the magnetomotive force mmf ________.

A)remains the same
B)decreases
C)increases
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58
An <strong>An   is a unit of ________.</strong> A)magnetomotive force (mmf) B)permeability C)reactance D)resistance is a unit of ________.

A)magnetomotive force (mmf)
B)permeability
C)reactance
D)resistance
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59
The movable part of the relay is the:

A)electromagnetic coil.
B)the armature.
C)magnetic field.
D)all of these.
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60
Hysteresis is a characteristic of magnetic materials wherein a change in magnetization:

A)occurs after the application of a magnetic force.
B)varies according to the current flow.
C)occurs exactly with the application of a magnetic force.
D)occurs before the application of a magnetizing force.
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61
Faradayʹs law states that the voltage induced across a coil of wire is proportional to these two factors.

A)the diameter of the conductor and the rate of change of the magnetic flux
B)the size of the coil and the rate of change of the magnetic flux
C)the number of turns in the coil and the rate of change of the magnetic flux
D)the size of the magnets and the rate of change of the magnetic flux
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62
For a high current switching application where it is not practical to route heavy wiring to the switch location which device would be used?

A)electromagnet
B)solenoid
C)relay
D)generator
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63
Induced voltage resulting from electromagnetic induction is proportional to:

A)the rate at which the conductor and magnetic fields move relative to each other.
B)the angle at which the conductor cuts the magnetic field.
C)the number of turns of wire in the coil.
D)all of these.
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64
The purpose of a commutator in a dc generator is to:

A)concentrate flux density.
B)provide filtration.
C)keep current flowing in one direction.
D)maximize the current generated.
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65
Faradayʹs law and Lenzʹs law are related in that they deal with:

A)an induced voltage.
B)a resulting current flow.
C)varying magnetic field.
D)all of these.
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66
If a higher voltage is needed from a generator, what must be done?

A)Increase the distance between the coil and magnetic field.
B)Turn the coil faster.
C)Decrease the number of coils.
D)both B and C.
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