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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 rating of a transformer in kilovolt- amps.
Delta Connection
Significance of 1.73
KVA Rating
Efficiency
2. The winding that is connected to the load. It does not necessarily have to be the low voltage winding.
Transformer Polarity
Secondary Winding
Additive Polarity
Wye Connection
3. The effects of inductance are mutual between the primary and secondary. The current in the primary induces a voltage in the secondary.
Mutual Inductance
Polarity Markings
Efficiency
Significance of 1.73
4. 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
KVA Rating
Secondary Winding
Hysteresis Losses
Polarity Markings
5. 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
Efficiency
Transformer Polarity
Secondary Winding
6. A system of (ANSI) markings of the transformer leads. The high voltage leads are 'H' leads and the low voltage leads are 'X' leads.
Secondary Winding
Transformer Polarity
Significance of 1.73
Hysteresis Losses
7. The connection of a transformer to form a 'A' configuration. Delta connections can be made by connecting odd to even terminals.
Hysteresis Losses
KVA Rating
Wye Connection
Delta Connection
8. (+) = Positive and (-) = Negative. Also see Transformer Polarity.
Polarity Markings
Significance of 1.73
Additive Polarity
Delta Connection
9. Efficiency is always the ratio of output to input. It is the ratio of true (output power) to apparent (input power).
Efficiency
Hysteresis Losses
Polarity Markings
Significance of 1.73
10. The primary winding is the winding that is connected to the source voltage. It does not necessarily have to be the high voltage winding.
Wye Connection
Primary Winding
Delta Connection
KVA Rating
11. Polarity where the HI marking is opposite the X2 marking and the H2 marking is opposite the X1 marking.
Transformer Polarity
Additive Polarity
Primary Winding
KVA Rating
12. 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.
Mutual Inductance
Polarity Markings
Significance of 1.73
Wye Connection