Transformers - General Questions (2)

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Transformers - General Questions

mcq14_1003

What is the secondary voltage in the given circuit?

A.	13.3 V rms in phase with the primary
B.	120 V rms in phase with the primary
C.	13.3 V rms out of phase with the primary
D.	120 V rms out of phase with the primary

Answer: Option C

Explanation:

No answer description available for this question.

10.

What is the turns ratio of the transformer needed to match a 1 k omega (5) source resistance to a 160 load?

A.	2.5:1
B.	0.4:1
C.	6.25:1
D.	16:1

Answer: Option B

Explanation:

No answer description available for this question.

11.

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

A.	increase the secondary current
B.	decrease the secondary current
C.	have no effect on the secondary current
D.	increase the primary current

Answer: Option B

Explanation:

No answer description available for this question.

12.

The coefficient of coupling between two coils is 0.45. The first coil has an inductance of 75 mH and the second coil has an inductance of 105 mH. What is the mutual inductance between the coils?

A.	3.54 mH
B.	7.88 mH
C.	39.9 mH
D.	189.3 mH

Answer: Option C

Explanation:

No answer description available for this question.

13.

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 (5) load. What is the efficiency of the transformer?

A.	88%
B.	90%
C.	92%
D.	95%

Answer: Option B

Explanation:

No answer description available for this question.

14.

When does maximum power transfer happen from the source to the load?

A.	When the source resistance is greater than the load resistance
B.	When the source resistance is less than the load resistance
C.	When there is negligible source resistance
D.	When the source resistance equals the load resistance

Answer: Option D

Explanation:

No answer description available for this question

Transformers - General Questions (2)

Transformers - General Questions

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