Electronics - Transformers

Exercise :: Transformers - Filling the Blanks

1. 

To ensure a high coefficient of coupling, all fixed transformers are usually wound on a(n) _____________.

A. EI core
B. iron core
C. common core
D. CI core

Answer: Option C

Explanation:

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2. 

The reflected resistance is ___ as seen by the source in the given circu.

A. 150 omega.gif
B. 300 omega.gif
C. 600 omega.gif
D. 2.4 komega.gif

Answer: Option D

Explanation:

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3. 

The secondary current is _____ in the given circuit.

A. 1.9 mA
B. 7.5 mA
C. 30 mA
D. 60 mA

Answer: Option C

Explanation:

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4. 

Making the load resistance appear the same as the source's internal resistance is called _____.

A. maximum power transfer
B. reflected resistance
C. impedance matching
D. reflected load

Answer: Option C

Explanation:

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5. 

A transformer turns ratio of ________ will be needed to match an output impedance of 5 komega.gif to an 8 omega.gif speaker.

A. 5:1
B. 8:1
C. 25:1
D. 625:1

Answer: Option C

Explanation:

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