MM0704, Lesson 4
10.
What currents in a transformer core follow a circular path?
a.
Eddy
b.
Primary.
c.
Secondary.
d.
Tertiary
11.
Why are laminated cores used in transformers?
a.
To increase power losses.
b.
To increase voltage turns ratio.
c.
To increase current turns ratio.
d.
To reduce power losses.
12.
What form of magnetism remains in a transformer's core after the magnetizing current becomes zero?
a.
Initial.
b.
Positive.
c.
Negative.
d.
Residual.
13.
How are the low and high voltage sides of a power transformer identified?
a.
Low voltage side has larger wire diameter.
b.
High voltage side has larger wire diameter.
c.
High voltage side is colored black.
d.
Low voltage side is colored black
14.
Why are high power transformers immersed in oil?
a.
To decrease heat dissipation.
b.
To increase heat dissipation.
c.
To decrease coupling
d.
To increase coupling.
15.
What is the characteristic of the winding of an autotransformer?
a.
Parallel primary and secondary.
b.
Series primary and secondary
c.
One winding for primary and secondary.
d.
Two windings for primary and secondary.
102
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