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Test your basic knowledge |
Industrial Electrical Transformer Principles
Start Test
Study First
Subjects
:
engineering
,
ib
Instructions:
Answer 12 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. The multiplier from line to neutral in a 3- phase transformer. Example: A 3- phase 'Y' to neutral--208 volts divided by 1.73 equals 120 volts.
Secondary Winding
Polarity Markings
Hysteresis Losses
Significance of 1.73
2. The result of the energy wasted in reversing the magnetization of the core every time the current reverses and magnetizes the core in a different direction
Significance of 1.73
Hysteresis Losses
KVA Rating
Delta Connection
3. The primary winding is the winding that is connected to the source voltage. It does not necessarily have to be the high voltage winding.
Additive Polarity
Significance of 1.73
Primary Winding
Wye Connection
4. The effects of inductance are mutual between the primary and secondary. The current in the primary induces a voltage in the secondary.
Transformer Polarity
Mutual Inductance
Additive Polarity
Primary Winding
5. Polarity where the HI marking is opposite the X2 marking and the H2 marking is opposite the X1 marking.
Significance of 1.73
Additive Polarity
Hysteresis Losses
Delta Connection
6. The rating of a transformer in kilovolt- amps.
KVA Rating
Hysteresis Losses
Primary Winding
Additive Polarity
7. (+) = Positive and (-) = Negative. Also see Transformer Polarity.
Wye Connection
Transformer Polarity
Polarity Markings
Delta Connection
8. The winding that is connected to the load. It does not necessarily have to be the low voltage winding.
Additive Polarity
Primary Winding
Polarity Markings
Secondary Winding
9. The connection of transformer to form a 'Y' configuration. 'Y' connections can be made by connecting either the even terminals or the odd terminals together.
Wye Connection
KVA Rating
Additive Polarity
Hysteresis Losses
10. A system of (ANSI) markings of the transformer leads. The high voltage leads are 'H' leads and the low voltage leads are 'X' leads.
Transformer Polarity
Significance of 1.73
Efficiency
Additive Polarity
11. The connection of a transformer to form a 'A' configuration. Delta connections can be made by connecting odd to even terminals.
Delta Connection
Hysteresis Losses
Wye Connection
Mutual Inductance
12. Efficiency is always the ratio of output to input. It is the ratio of true (output power) to apparent (input power).
Significance of 1.73
Delta Connection
Efficiency
Primary Winding