Transformers - Practice Questions

Question 1

For mutual inductance to occur, the two coils must be at right angles to each other.

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Question 2

The reflected load value that the source sees will always be larger than the load value itself.

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Question 3

A transformer is plugged into a 120 V rms source and has a primary current of 300 mA rms. The secondary is providing 18 V across a 10 omega.gif load. What is the efficiency of the transformer?

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Question 4

The secondary voltages produced by a center-tapped transformer are equal in amplitude but 180&deg; out of phase with respect to the center tap.

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Question 5

What is the turns ratio of the transformer needed to match a 1 komega.gif source resistance to a 160 omega.gif load?

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Question 6

If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is

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Question 7

Increasing the number of turns of wire on the secondary of a transformer will

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Question 8

If the current drawn in the secondary of a transformer increases, the power in the primary should remain the same.

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Question 9

If an analog signal is to be converted to an 8-bit resolution, how many comparators are used in a parallel-encoded ADC?

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Question 10

An open secondary winding of a transformer will cause the primary current to be nearly zero.

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