MM0704, Lesson 4
6.
What BEST describes the turns ratio of this transformer circuit? See figure 4-27.
a.
1 to 2 step-up.
b.
1 to 2 step-down.
c.
3 to 1 step-down.
d.
3 to 1 step-up.
7.
What is the impedance, in ohms, of the secondary of a step-down transformer that as a turns ratio of 2:1 and a
primary impedance of 2,000 ? See figure 4-27.
a.
8,000.
b.
5,000.
c.
1,000.
d.
500.
8.
If the current ratio of a transformer is 4:1, what is the turns ratio? See figure 4-27.
a.
1 turn in primary for every 4 in secondary.
b.
4 turns in primary for every 1 in secondary.
c.
2 turns in primary for every 1 in secondary
d.
1 turn in primary for every 2 in secondary.
Figure 4-27. Transformer (Unity Coupling).
9.
What is the transformer coefficient of coupling, if the primary inductance is 9 h, the secondary inductance is 4
h, and the mutual inductance is 4 h?
a.
.80.
b.
.75.
c.
.66.
d.
.52.
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