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