Q. In a transformer, what does the turns ratio determine?
A.
The efficiency of the transformer
B.
The voltage transformation
C.
The current rating
D.
The core material
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Solution
The turns ratio of a transformer determines the voltage transformation between the primary and secondary windings.
Correct Answer:
B
— The voltage transformation
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Q. What is the function of a transformer tap changer?
A.
To change the core material
B.
To adjust the turns ratio
C.
To increase the efficiency
D.
To provide overload protection
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Solution
A transformer tap changer is used to adjust the turns ratio, allowing for voltage regulation under varying load conditions.
Correct Answer:
B
— To adjust the turns ratio
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Q. What is the main advantage of using an autotransformer?
A.
Higher efficiency
B.
Lower cost
C.
Smaller size
D.
All of the above
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Solution
Autotransformers are more efficient, cost-effective, and smaller in size compared to conventional transformers.
Correct Answer:
D
— All of the above
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Q. What is the main disadvantage of using a step-down transformer?
A.
Increased voltage
B.
Increased current
C.
Higher losses
D.
Limited applications
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Solution
Step-down transformers can have higher losses due to increased current in the secondary winding.
Correct Answer:
C
— Higher losses
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Q. What is the primary cause of transformer losses?
A.
Copper losses
B.
Iron losses
C.
Stray losses
D.
All of the above
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Solution
Transformers experience copper losses (due to resistance in windings), iron losses (due to hysteresis and eddy currents), and stray losses.
Correct Answer:
D
— All of the above
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Q. What is the purpose of a transformer in a power distribution system?
A.
To convert power to mechanical energy
B.
To reduce transmission losses
C.
To increase the frequency of the supply
D.
To provide backup power
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Solution
Transformers in power distribution systems help reduce transmission losses by stepping up voltage for long-distance transmission.
Correct Answer:
B
— To reduce transmission losses
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Q. What is the purpose of a transformer oil?
A.
To insulate the windings
B.
To cool the transformer
C.
To prevent corrosion
D.
All of the above
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Solution
Transformer oil serves multiple purposes including insulation, cooling, and preventing corrosion.
Correct Answer:
D
— All of the above
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Q. What is the role of a transformer in a distribution system?
A.
To generate electricity
B.
To step down voltage for consumer use
C.
To store energy
D.
To protect against faults
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Solution
In a distribution system, transformers step down high transmission voltages to lower voltages suitable for consumer use.
Correct Answer:
B
— To step down voltage for consumer use
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Q. What is the significance of the core material in a transformer?
A.
It affects the weight of the transformer
B.
It influences the efficiency and performance
C.
It determines the color of the transformer
D.
It has no significant impact
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Solution
The core material significantly influences the efficiency and performance of a transformer by affecting magnetic properties.
Correct Answer:
B
— It influences the efficiency and performance
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Q. What is the typical frequency of operation for power transformers?
A.
50 Hz
B.
60 Hz
C.
400 Hz
D.
Both 50 Hz and 60 Hz
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Solution
Power transformers typically operate at either 50 Hz or 60 Hz, depending on the region.
Correct Answer:
D
— Both 50 Hz and 60 Hz
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Q. What is the typical frequency of transformers used in power systems?
A.
50 Hz
B.
60 Hz
C.
400 Hz
D.
All of the above
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Solution
Transformers can operate at various frequencies, with 50 Hz and 60 Hz being the most common in power systems, and 400 Hz used in aviation and some specialized applications.
Correct Answer:
D
— All of the above
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Q. What type of transformer is used for electrical isolation?
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Three-phase transformer
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Solution
An isolation transformer is specifically designed to provide electrical isolation between its primary and secondary windings.
Correct Answer:
C
— Isolation transformer
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Q. Which of the following is a common application of transformers?
A.
Voltage regulation in power systems
B.
Signal amplification in audio systems
C.
Energy storage in batteries
D.
Frequency conversion in inverters
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Solution
Transformers are commonly used for voltage regulation in power systems to ensure stable voltage levels.
Correct Answer:
A
— Voltage regulation in power systems
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Q. Which type of transformer is used to increase voltage?
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Auto transformer
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Solution
A step-up transformer increases the voltage from the primary to the secondary winding.
Correct Answer:
A
— Step-up transformer
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