Name: 
 

Chapter 16



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 

If a transformer has 1000 turns in the primary winding and 100 turns in the secondary winding, the turns ratio of this transformer is ____.
a.
1 to 10
c.
100,000 to 1
b.
10 to 1
d.
10,000 to 1
 

2. 

The ____ current is the amount of current required to magnetize the core of the transformer.
a.
start-up
c.
excitation
b.
control
d.
ratio
 

3. 

A good rule for any transformer is that ____ in must equal ____ out.
a.
voltage, voltage
c.
amperage, amperage
b.
power, power
d.
resistance, resistance
 

4. 

If a transformer has several taps on the primary winding and no taps on the secondary winding, it can be connected to different primary voltages without changing the value of the secondary ____.
a.
amperage
c.
voltage
b.
resistance
d.
wattage
 

5. 

Primary transformer windings are labeled with the letter ____.
a.
S
c.
P
b.
X
d.
H
 

6. 

____ are one-winding transformers.
a.
Control transformers
c.
Distribution transformers
b.
Autotransformers
d.
Isolation transformers
 

7. 

____ are often used by power companies to provide voltage regulation to large power lines.
a.
Isolation transformers
c.
Control transformers
b.
Distribution transformers
d.
Autotransformers
 

8. 

The polarity of transformer windings can be determined by connecting them as a(n) ____ and testing them for additive or subtractive polarity.
a.
isolation transformer
c.
distribution transformer
b.
control transformer
d.
autotransformer
 

9. 

When testing a transformer, if one ohmmeter lead is connected to a transformer winding and the other is connected to the transformer frame, you are testing the transformer for ____.
a.
shorted windings
c.
continuity
b.
grounds
d.
voltage
 

10. 

When testing a transformer, if one ohmmeter lead is connected to the lead of a transformer winding and the other ohmmeter lead is connected to the other lead of the same winding, you are testing the transformer for ____.
a.
shorted windings
c.
continuity
b.
grounds
d.
voltage
 



 
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