Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
What is the primary function of an alternator?
to produce direct current (DC)
to store electrical energy
to transform kinetic energy into electrical energy
to convert electrical energy into kinetic energy
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What type of current do alternators generate?
both AC and DC
alternating current (AC)
direct current (DC)
neither AC nor DC
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What is the phenomenon responsible for generating electric current in an alternator?
electromagnetic induction
thermoelectric effect
piezoelectric effect
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When is the flux linkage in a rotating coil at its maximum?
when the normal of the coil is parallel to the magnetic field lines
when the normal of the coil is perpendicular to the magnetic field lines
the flux linkage remains constant throughout the rotation
when the normal of the coil is at a 45° angle to the magnetic field lines
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At what point during the coil's rotation is the induced e.m.f. at its maximum?
the induced e.m.f. remains constant throughout the rotation
when the rate of change of magnetic flux is greatest
when the flux linkage is greatest
when the flux linkage is zero
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When does the induced e.m.f. in a rotating coil reach zero?
when the coil is parallel to the magnetic field
when the coil is perpendicular to the magnetic field
the induced e.m.f. never reaches zero
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How does increasing the angular velocity of the coil affect the induced e.m.f.?
it decreases the induced e.m.f.
it has no effect on the induced e.m.f.
it causes the induced e.m.f. to remain constant
it increases the induced e.m.f.
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What is the effect of a stronger magnetic field on the flux linkage in a rotating coil?
it decreases the flux linkage
it causes the flux linkage to remain constant
it increases the flux linkage
it has no effect on the flux linkage
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Explain the process of generating alternating current in an alternator.
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Describe the relationship between the angle of the coil and the flux linkage during one rotation.
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List three factors that influence the peak induced e.m.f. in an alternator and explain how they affect it.
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A coil in an A.C. generator has 100 turns and rotates in a magnetic field of 0.3 Tesla with an angular velocity of 200 rad s-1. What is the maximum induced electromotive force (e.m.f.) if the coil area is 0.05 m²?
300 V
600 V
900 V
1,500 V
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If the angular velocity of a coil in an A.C. generator is doubled from 100 rad s-1 to 200 rad s-1, how does the maximum induced e.m.f. change, assuming all other factors remain constant?
it triples.
it remains the same.
it doubles.
it quadruples.
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A generator's coil with an area of 0.2 m² and 200 turns rotates within a magnetic field of 0.4 Tesla. What angular velocity is required to produce a maximum induced e.m.f. of 800 V?
400 rad s-1
200 rad s-1
100 rad s-1
50 rad s-1
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A coil with 150 turns and an area of 0.15 m² is placed in a 0.25 Tesla magnetic field. What is the maximum induced e.m.f. when the coil rotates with an angular velocity of 50 rad s-1?
562.55 V
281.25 V
1,125 V
2,250 V
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