MM0704, Lesson 4
16.
What range of frequencies is transferred by audio transformers?
a.
25 kHz to 60 kHz.
b.
25 kHz to 50 kHz.
c.
20 kHz to 30 kHz.
d.
20 Hz to 20 kHz.
17.
What type of circuit is employed in figure 4-28?
a.
Tuned secondary.
b.
Tuned primary.
c.
Step-up.
d.
Step-down.
18.
How can the coupling in the circuit be increased? See figure 4-28.
a.
By decreasing the mutual inductance.
b.
By increasing C.
c.
By decreasing C.
d.
By inserting a powdered iron core.
Figure 4-28. Tuned Transformer.
19.
What condition indicates transformer saturation?
a.
Flux increased by magnetizing force increase.
b.
Flux remains constant even though magnetizing force decreases.
c.
Flux decreased by magnetizing force increase.
d.
Flux remains constant even though magnetizing force increases.
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