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Multiple Choice Quiz: Transformers:
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1. What is the main function of a transformer?
A) To convert AC to DC
B) To change AC voltage levels without altering frequency
C) To increase power frequency
D) To generate electrical energy
2. Which winding of a transformer receives the input voltage?
A) Secondary winding
B) Neutral winding
C) Primary winding
D) Auto-winding
3. In which type of transformer does the secondary voltage exceed the primary voltage?
A) Step-down transformer
B) Step-up transformer
C) Isolation transformer
D) Auto-transformer
4. Which transformer type is commonly used in residential power distribution?
A) Step-up transformer
B) Step-down transformer
C) Isolation transformer
D) Instrument transformer
5. What is the main purpose of an isolation transformer?
A) Increase voltage
B) Reduce frequency
C) Electrically separate primary and secondary circuits
D) Convert AC to DC
6. Which transformer type shares part of its winding between input and output?
A) Step-down transformer
B) Isolation transformer
C) Auto-transformer
D) Instrument transformer
three-phase 10. What
7. What is a key advantage of three-phase transformers over single-phase transformers?
A) Simpler construction
B) Smaller size and lighter weight
C) Higher efficiency and balanced power delivery
D) No need for grounding
8. In a three-phase transformer, how many input terminals are typically present (excluding neutral)?
A) Two
B) Three
C) Four
D) Six
9. Which connection types are commonly used in three-phase transformers?
A) Star (Y) and Delta (Δ)
B) Series and Parallel
C) Positive and Negative
D) Open and Closed Loop
10. Why are isolation transformers often used in marine power systems?
A) To step down shore power voltage
B) To block ground loops and prevent electrical shock
C) To increase system frequency
D) To reduce conductor size
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