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Transformers - General Questions

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Transformers - General Questions

1. 

A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 . The load resistance as seen by the source is

A. 1.3 Ω
B. 7.8 Ω
C. 78 Ω
D. 13 Ω

Answer: Option D

Explanation:

No answer description available for this question. 
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2. 

What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary?

A. 0.4
B. 4
C. 9.6
D. 0.96

Answer: Option D

Explanation:

No answer description available for this question. 
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3. 

When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

A. 0 V
B. 6 V
C. 48 V
D. 0.75 V

Answer: Option A

Explanation:

No answer description available for this question.
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4. 

In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

A. 0 W
B. 14.1 W
C. 111.5 W
D. 1,020 W

Answer: Option C

Explanation:

No answer description available for this question. 
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5. 

When a 200  load resistor is connected across the secondary winding of a transformer with a turns ratio of 4, the source "sees" a reflective load of

A. 50 Ω
B. 12.5 Ω
C. 800 Ω
D. 0 Ω

Answer: Option B

Explanation:

No answer description available for this question. 
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6. 

To step 120 V ac up to 900 V ac, the turns ratio must be

A. 75
B. 750
C. 7.5
D. 0.13

Answer: Option C

Explanation:

No answer description available for this question. 
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7. 

The primary of a transformer is connected to a 6 V battery. The turns ratio is 1:3 and the secondary load, RL, is 100 . The voltage across the load is

A. 0 V
B. 6 V
C. 18 V
D. 2 V

Answer: Option A

Explanation:

No answer description available for this question. 
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8. 

A transformer

A. changes ac to dc
B. changes dc to ac
C. steps up or down dc voltages
D. steps up or down ac voltages

Answer: Option D

Explanation:

No answer description available for this question. 
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