WorksheetsUnderstanding Transformer Connections and Three-Phase Units
Total questions: 6
Worksheet time: 3mins
Name
Class
Date
1.
What is the primary connection type for phase-to-ground in transformers?
a)
Delta
b)
Wye
c)
Star
d)
Zigzag
2.
Fill in the blank: The 'power' transformer is normally _______ because it supplies some of the three-phase load.
a)
larger
b)
smaller
c)
equal
d)
negligible
3.
What is the configuration called when three-phase power cannot come from Open-Wye secondary?
a)
Open-Delta
b)
Closed-Delta
c)
Star-Delta
d)
Zigzag-Delta
4.
What should you not connect to the lighting load in a three-phase system?
a)
120 volts
b)
208 volts
c)
240 volts
d)
480 volts
5.
Remove the _______ if your using a power pot
a)
Power leg
b)
Ground strap
c)
Neutral
d)
Fusing
6.
What is always needed to identify in the bank for a 120/240 three-phase secondary?
a)
Power leg
b)
Ground strap
c)
Neutral
d)
Fusing
100 %