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Exam 14: Magnetic Induction

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Question 1

Multiple Choice

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Losses in the core of iron core inductors include _____ and _____ losses.

A) eddy current; hysteresis
B) resistive; inductive
C) reactive; inductive
D) hysteresis; inductive

E) C) and D)
F) A) and B)

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Question 2

True/False

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The amount of voltage induced into a conductor depends on the turns of wire, the strength of the magnetic field, and the speed of cutting action.

A) True
B) False

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Question 3

Multiple Choice

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During the period of time known as the first time constant of an exponential curve, the current will rise to about _____ percent of its full value.

A way of determining the relationships of the motion of the conductor, the magnetic field direction, and the direction of the induced current is by using the _____.

When a conductor cuts magnetic lines of force, a voltage is induced into the conductor. This principle is called _____.

The time required for current in an inductor to reach its full Ohm's law value is called the _____ time constant.

When the current flow through an inductor stops and the current also decreases at an exponential rate, a (n) _______________ occurs.

​Exponential curves are always divided into _____ time constants.

When a closed loop of wire cuts through magnetic flux lines, a current is induced into the loop. The current in the loop sets up a magnetic field that is in opposition to the original magnetic flux. This is essentially _____.

When using the left-hand generator rule, the thumb points to the direction of _____.

A coil has an inductance of 3 H and a wire resistance of 15 Ω . How long will it take for the current to reach its full value?

The magnetic quantity Weber (Wb) is equal to 100,000,000 lines of flux. If a conductor cuts through one Weber per second, then a voltage of _____ volt(s) is induced into the conductor.

Inductors always _______________ a change of current.

If a conductor is moved upward, the polarity of induced voltage is reversed and the current flows in the _______________ direction.

What is one device used for spike suppression in either direct or alternating current circuits?

The direction of induced current can be determined by using _____'s left-hand generator rule.

If current is flowing in a circuit containing an inductor and the power switch is opened, the magnetic field surrounding the inductor collapses and induces voltage into the inductor, resulting in a voltage spike.

When using the left-hand generator rule, the center finger points to the direction of _____.

If a voltage is being induced into a conductor by electromagnetic induction, reversing the direction of motion of the conductor will _____.

What is the unit of measurement for inductance?