#### The Following Section consists of Multiple Choice Questions on Magnetism and Electromagnetism.

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Magnetism and Electromagnetism MCQ

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- Question 1 of 20
##### 1. Question

1 points#### When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

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##### 2. Question

1 points#### The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

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##### 3. Question

1 points#### For a given wirewound core, an increase in current through the coil

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##### 4. Question

1 points#### If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### When the current through the coil of an electromagnet reverses, the

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### The unit for reluctance is

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##### 9. Question

1 points#### If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet’s air gap, the induced voltage

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### The unit for permeability is

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##### 12. Question

1 points#### What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

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##### 13. Question

1 points#### The direction of a magnetic field within a magnet is

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### When the north poles of two bar magnets are brought close together, there will be

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##### 15. Question

1 points#### The ability of a material to remain magnetized after removal of the magnetizing force is known as

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##### 16. Question

1 points#### The induced voltage across a stationary conductor in a stationary magnetic field is

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##### 17. Question

1 points#### An electromagnetic field exists only when there is

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##### 18. Question

1 points#### When a solenoid is activated, the force that moves the plunger is

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##### 19. Question

1 points#### What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

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##### 20. Question

1 points#### If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

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#### Information

Magnetism and Electromagnetism MCQ 2

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- Question 1 of 20
##### 1. Question

1 points#### Permeability is the inverse equivalent of which electrical term?

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### Which electromagnetic device uses brushes and a commutator?

CorrectIncorrect - Question 3 of 20
##### 3. Question

1 points#### What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m

^{2}?CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### How much flux is there in a magnetic field when its flux density is 5000 mu.gifT and its cross-sectional area is 300 mm

^{2}?CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### What are the effects of moving a closed wire loop through a magnetic field?

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##### 6. Question

1 points#### The Hall effect

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##### 7. Question

1 points#### “Series” and “parallel” as applied to dc motors refer to

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##### 8. Question

1 points#### The component that produces power in an electromagnetic generator is called the

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##### 9. Question

1 points#### What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?

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##### 10. Question

1 points#### A Hall effect sensor

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##### 11. Question

1 points#### Which electromagnetic device has a flexible cone?

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##### 12. Question

1 points#### What is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m

^{2}, and a permeability of 2500 µWb/At·m?CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### The unit of flux density is known as

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### What do you call the characteristic of a magnetic material whereby a change in magnetization lags the application of a magnetizing force?

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##### 15. Question

1 points#### Which electromagnetic device has a movable iron core called a plunger?

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##### 16. Question

1 points#### Which electromagnetic device contains an armature?

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### The direction of induced current is given by?

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##### 18. Question

1 points#### The energy resides in a current carrying conductor in the form of

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##### 19. Question

1 points#### If positively charged particles enter with high velocity from the sky towards the earth, then the earths magnetic field will deflect them towards

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##### 20. Question

1 points#### The motional e.m.f. induced in a coil is independent of

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