Question 1

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

Accepted Answer

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

Question 2

-What is the secondary current in Figure 14-1 with a  load resistor and 3:1 turns ratio?

Accepted Answer

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

Question 3

For a transformer to operate properly, it must:

Accepted Answer

A)  be supplied with the proper AC signal.
B)  work within its voltage, current and power ratings.
C)  be connected to a load.
D)  all of these.E) None of the above
F) All of the above

Question 4

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

Accepted Answer

A)  Replace the transformer.
B)  Remove some turns from the half with the higher voltage winding.
C)  Add some turns to the half with the lower voltage winding.
D)  Do not concern yourself; the customer will probably not notice the problem.E) A) and B)
F) A) and C)

Question 5

The turns ratio of a transformer (n)  is defined as:

Accepted Answer

A)  the number of turns in the secondary divided by the number of turns in the primary.
B)  the number of turns in the primary divided by the number of turns in the secondary.
C)  the number of turns in the primary multiplied by the number of turns in the secondary.
D)  the number of turns in the secondary multiplied by the number of turns in the primary.E) A) and C)
F) A) and B)

Question 6

The relationship for the current ration (Isec/Ipri)  in a transformer is:

Accepted Answer

A)   
B)   
C)   
D)   E) All of the above
F) A) and B)

Question 7

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

Accepted Answer

A)  26.6 V
B)  106 V
C)  13.3 V
D)  53.2 VE) B) and C)
F) A) and B)

Exam 14: Transformers

The turns ratio of a transformer (n) is defined as:

Correct Answer
verified

The relationship for the current ration (Isec/Ipri) in a transformer is:

Correct Answer
verified

For a transformer to operate properly, it must:

Correct Answer
verified

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

Correct Answer
verified

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

Correct Answer
verified

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

Correct Answer
verified

-What is the secondary current in Figure 14-1 with a load resistor and 3:1 turns ratio?

Correct Answer
verified

Exam 14: Transformers

The turns ratio of a transformer (n) is defined as:

Correct AnswerverifiedShow Answer

The relationship for the current ration (Isec/Ipri) in a transformer is:

Correct AnswerverifiedShow Answer

For a transformer to operate properly, it must:

Correct AnswerverifiedShow Answer

-What is the secondary voltage in Figure 14-1 if the turns ratio is 9:1?

Correct AnswerverifiedShow Answer

What is the likeliest way to fix a center-tapped transformer which outputs unequal voltages on each half of the secondary?

Correct AnswerverifiedShow Answer

-In Figure 14-1, the primary to secondary turns ratio is changed to 2.5:1 and the secondary current equals 100 mA. What is the reflected resistance seen by the primary?

Correct AnswerverifiedShow Answer

-What is the secondary current in Figure 14-1 with a load resistor and 3:1 turns ratio?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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