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