Q. In a three-phase transformer, how many primary and secondary windings are there?
-
A.
1 primary, 1 secondary
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B.
3 primary, 3 secondary
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C.
2 primary, 2 secondary
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D.
4 primary, 4 secondary
Solution
A three-phase transformer has 3 primary windings and 3 secondary windings.
Correct Answer:
B
— 3 primary, 3 secondary
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Q. In a three-phase transformer, how many sets of windings are required?
-
A.
One
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B.
Two
-
C.
Three
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D.
Four
Solution
A three-phase transformer requires three sets of windings, one for each phase.
Correct Answer:
C
— Three
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Q. What is the effect of increasing the frequency on a transformer's size?
-
A.
Increases size
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B.
Decreases size
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C.
No effect
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D.
Depends on the load
Solution
Increasing the frequency allows for a smaller transformer size due to reduced core losses.
Correct Answer:
B
— Decreases size
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Q. What is the main purpose of a transformer protection relay?
-
A.
To measure voltage
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B.
To detect faults and protect the transformer
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C.
To regulate output voltage
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D.
To monitor temperature
Solution
The main purpose of a transformer protection relay is to detect faults and protect the transformer.
Correct Answer:
B
— To detect faults and protect the transformer
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Q. What is the main purpose of a transformer tap changer?
-
A.
To increase the voltage
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B.
To decrease the voltage
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C.
To adjust the output voltage
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D.
To protect the transformer
Solution
A transformer tap changer is used to adjust the output voltage to maintain desired levels.
Correct Answer:
C
— To adjust the output voltage
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Q. What is the primary cause of transformer overheating?
-
A.
High ambient temperature
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B.
Overloading
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C.
Poor ventilation
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D.
All of the above
Solution
Transformer overheating can be caused by high ambient temperature, overloading, and poor ventilation.
Correct Answer:
D
— All of the above
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Q. What is the purpose of a transformer protection relay?
-
A.
To increase voltage
-
B.
To monitor temperature
-
C.
To detect faults and isolate the transformer
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D.
To regulate current
Solution
A transformer protection relay is designed to detect faults and isolate the transformer from the system.
Correct Answer:
C
— To detect faults and isolate the transformer
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Q. What type of transformer is used to isolate different parts of a power system?
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A.
Step-up transformer
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B.
Step-down transformer
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C.
Isolation transformer
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D.
Auto transformer
Solution
An isolation transformer is used to isolate different parts of a power system.
Correct Answer:
C
— Isolation transformer
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Q. Which of the following is a common cooling method for large transformers?
-
A.
Air cooling
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B.
Water cooling
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C.
Oil cooling
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D.
All of the above
Solution
Large transformers can be cooled using air, water, or oil cooling methods.
Correct Answer:
D
— All of the above
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Q. Which of the following losses is primarily associated with the core of a transformer?
-
A.
Copper loss
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B.
Iron loss
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C.
Stray loss
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D.
Hysteresis loss
Solution
Iron loss, which includes hysteresis and eddy current losses, is primarily associated with the core of a transformer.
Correct Answer:
B
— Iron loss
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