20 questions and answers about Transformers
1- What is Transforme
Answer: A transformer is a type of stationary electrical device that changes the voltage of electricity but keeps the frequency unchanged.
2- What is the main function of a transformer?
Answer: Step-up or step-down voltage.
3- On what principle does a transformer work?
Answer: On the principle of electromagnetic induction.
4- How many coils does a transformer have?
Answer: Mainly two – primary coil and secondary coil.
5- Why don't transformers work on DC?
Answer: Because the flux does not change in DC, electromagnetic induction does not occur.
6- Where are power transformers used?
Answer: In substations and power transmission systems.
7- What is the function of a distribution transformer?
Answer: Providing electricity at a voltage suitable for the consumer.
8- What material is the core of a transformer made of?
Answer: With silicon steel lamination.
9- Why is oil used in transformers?
Answer: For cooling and insulation.
10- What is the average efficiency of a transformer?
Answer: From 95% to 99%.
11- In which unit is the rating of a transformer expressed?
Answer: In kVA.
12- What causes no-load loss in transformers?
Answer: Due to core loss.
13- How many parts is core loss divided into?
Answer: Hysteresis loss and eddy current loss.
14- What causes load loss in transformers?
Answer: Due to copper loss or coil resistance.
15- What is the function of a tap changer in a transformer?
Answer: Voltage regulation.
16- What methods are used for cooling transformers?
Answer: Air cooling, oil cooling, forced air cooling, forced oil cooling.
17- Why are bushings used in transformers?
Answer: To connect the coil terminal to the outside.
18- What is determined by the short circuit test of a transformer?
Answer: Copper loss.
19- What is determined by the [#open_circuit] test of a transformer?
Answer: Core loss.
20- What is the function of the breather in a transformer?
Answer: Prevent moisture and dry the air with silica gel.
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