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 pointsWhen the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
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Question 2 of 20
2. Question
1 pointsThe 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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Question 3 of 20
3. Question
1 pointsFor a given wirewound core, an increase in current through the coil
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Question 4 of 20
4. Question
1 pointsIf the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
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Question 5 of 20
5. Question
1 pointsWhen the current through the coil of an electromagnet reverses, the
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Question 6 of 20
6. Question
1 pointsWhat 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?
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Question 7 of 20
7. Question
1 pointsA 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
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Question 8 of 20
8. Question
1 pointsThe unit for reluctance is
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Question 9 of 20
9. Question
1 pointsIf the steel disk in a crankshaft position sensor has stopped with the tab in the magnet’s air gap, the induced voltage
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Question 10 of 20
10. Question
1 pointsA basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?
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Question 11 of 20
11. Question
1 pointsThe unit for permeability is
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Question 12 of 20
12. Question
1 pointsWhat is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?
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Question 13 of 20
13. Question
1 pointsThe direction of a magnetic field within a magnet is
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Question 14 of 20
14. Question
1 pointsWhen the north poles of two bar magnets are brought close together, there will be
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Question 15 of 20
15. Question
1 pointsThe ability of a material to remain magnetized after removal of the magnetizing force is known as
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Question 16 of 20
16. Question
1 pointsThe induced voltage across a stationary conductor in a stationary magnetic field is
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Question 17 of 20
17. Question
1 pointsAn electromagnetic field exists only when there is
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Question 18 of 20
18. Question
1 pointsWhen a solenoid is activated, the force that moves the plunger is
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Question 19 of 20
19. Question
1 pointsWhat is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
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Question 20 of 20
20. Question
1 pointsIf a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
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Magnetism and Electromagnetism MCQ 2
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Question 1 of 20
1. Question
1 pointsPermeability is the inverse equivalent of which electrical term?
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Question 2 of 20
2. Question
1 pointsWhich electromagnetic device uses brushes and a commutator?
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Question 3 of 20
3. Question
1 pointsWhat is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
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Question 4 of 20
4. Question
1 pointsHow much flux is there in a magnetic field when its flux density is 5000 mu.gifT and its cross-sectional area is 300 mm2?
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Question 5 of 20
5. Question
1 pointsWhat are the effects of moving a closed wire loop through a magnetic field?
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Question 6 of 20
6. Question
1 pointsThe Hall effect
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Question 7 of 20
7. Question
1 points“Series” and “parallel” as applied to dc motors refer to
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Question 8 of 20
8. Question
1 pointsThe component that produces power in an electromagnetic generator is called the
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Question 9 of 20
9. Question
1 pointsWhat is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it?
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Question 10 of 20
10. Question
1 pointsA Hall effect sensor
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Question 11 of 20
11. Question
1 pointsWhich electromagnetic device has a flexible cone?
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Question 12 of 20
12. Question
1 pointsWhat is the reluctance of a material that has a length of 0.045 m, a cross-sectional area of 0.015 m2 , and a permeability of 2500 µWb/At·m?
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Question 13 of 20
13. Question
1 pointsThe unit of flux density is known as
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Question 14 of 20
14. Question
1 pointsWhat 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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Question 15 of 20
15. Question
1 pointsWhich electromagnetic device has a movable iron core called a plunger?
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Question 16 of 20
16. Question
1 pointsWhich electromagnetic device contains an armature?
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Question 17 of 20
17. Question
1 pointsThe direction of induced current is given by?
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Question 18 of 20
18. Question
1 pointsThe energy resides in a current carrying conductor in the form of
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Question 19 of 20
19. Question
1 pointsIf 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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Question 20 of 20
20. Question
1 pointsThe motional e.m.f. induced in a coil is independent of
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Magnetism and Electromagnetism MCQ 3
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Question 1 of 20
1. Question
1 pointsTransformers are used in circuits containing
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Question 2 of 20
2. Question
1 pointsWhich of the following is magnetic material:
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Question 3 of 20
3. Question
1 pointsThe attractive power. of a bar magnet is maximum. at:
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Question 4 of 20
4. Question
1 pointsThree pieces of metals X, Y and Z are tested for magnetism. Y attracts Mil: X and G X and Z d, attract each other Which of the following is correct?
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Question 5 of 20
5. Question
1 pointsA Neutral point is found where:.
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Question 6 of 20
6. Question
1 pointsIt is learnt that all magnetic substances lose their magnetism when:
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Question 7 of 20
7. Question
1 pointsIf magnet is broken into two equal pieces the pole strength of each half will be:
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Question 8 of 20
8. Question
1 pointsPermanent magnet attracts:
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Question 9 of 20
9. Question
1 pointsA mariner’s compass is used:
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Question 10 of 20
10. Question
1 pointsA steel bar can be magnetized by which one of the following methods:
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Question 11 of 20
11. Question
1 pointsWho first advanced the molecular theory of magnetism?
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Question 12 of 20
12. Question
1 pointsThe process of imparting the properties of the natural magnets to the other bodies is known as:
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Question 13 of 20
13. Question
1 pointsSubstances, which are strongly attracted by a magnet and can also be magnetised, are called:
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Question 14 of 20
14. Question
1 pointsSubstances, which are repelled by a magnet, are known as: .
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Question 15 of 20
15. Question
1 pointsThe force of repulsion b/w two magnetic poles depends upon:
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Question 16 of 20
16. Question
1 pointsCopper is a:
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Question 17 of 20
17. Question
1 pointsWhen an iron piece is magnetised its length:
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Question 18 of 20
18. Question
1 pointsMagnetism at the centre of the bar magnet is:
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Question 19 of 20
19. Question
1 pointsWhich one of the following is considered to be the best method for making a magnet?
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Question 20 of 20
20. Question
1 pointsA substance, which is feebly attracted by a magnet, is known as:
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Magnetism and Electromagnetism MCQ 4
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Question 1 of 15
1. Question
1 pointsWhen the current through a coil reverses direction, the magnetic field around the coil _____.
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Question 2 of 15
2. Question
1 pointsThe flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2
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Question 3 of 15
3. Question
1 pointsAfter the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________
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Question 4 of 15
4. Question
1 pointsYou can determine the direction of the lines of force surrounding a conductor by using _____.
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Question 5 of 15
5. Question
1 pointsA group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.
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Question 6 of 15
6. Question
1 pointsThe induced voltage across a stationary conductor in a stationary magnetic field ___.
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Question 7 of 15
7. Question
1 pointsWhen the speed at which a conductor is moved through a magnetic field is increased, the induced voltage will _____.?
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Question 8 of 15
8. Question
1 points___ is the ability of a material to remain magnetized after removal of the magnetizing force.
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Question 9 of 15
9. Question
1 pointsFerromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.
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Question 10 of 15
10. Question
1 pointsThe ____________ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.
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Question 11 of 15
11. Question
1 points
The movable part in a relay is the _____.
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Question 12 of 15
12. Question
1 pointsThe unit of magnetic flux density is the weber.
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Question 13 of 15
13. Question
1 pointsThe ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity.
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Question 14 of 15
14. Question
1 pointsMagnetic flux flows from the north pole to the south pole within the magnet.
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Question 15 of 15
15. Question
1 pointsThe ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis.
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