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The full load voltage drop in a 1-phase transformer is 2% and 4% respectively due to resistance and leakage reactance. Then the voltage drop is zero at __________
- a)0.45 lagging
- b)0.45 leading
- c)0.9 lagging
- d)0.9 leading
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The full load voltage drop in a 1-phase transformer is 2% and 4% respe...
Z = 4.47; cosθ = percentage x/percentage z = 4/4.47 = 0.89.
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The full load voltage drop in a 1-phase transformer is 2% and 4% respe...
Explanation:
The full load voltage drop in a 1-phase transformer can be divided into two components: voltage drop due to resistance and voltage drop due to leakage reactance.
Voltage drop due to resistance:
Resistance is the primary cause of voltage drop in a transformer. When a load is connected to the secondary side of the transformer, the current flows through the winding resistance, which causes a voltage drop. The magnitude of this voltage drop is proportional to the current flowing through the winding and the resistance of the winding.
Voltage drop due to leakage reactance:
Leakage reactance is another factor that contributes to the voltage drop in a transformer. Leakage reactance is caused by the magnetic flux that does not link with both the primary and secondary windings. This flux leakage induces a voltage drop across the winding reactance. The magnitude of this voltage drop is proportional to the current flowing through the winding and the reactance of the winding.
Total voltage drop:
The total voltage drop in a transformer is the sum of the voltage drop due to resistance and the voltage drop due to leakage reactance.
Given that the full load voltage drop in the transformer is 2% and 4% respectively due to resistance and leakage reactance, we can write the following equation:
Total voltage drop = Voltage drop due to resistance + Voltage drop due to leakage reactance
2% = Voltage drop due to resistance
4% = Voltage drop due to leakage reactance
Since the voltage drop is zero at a power factor of 0.9 lagging, it means that the voltage drop due to resistance and the voltage drop due to leakage reactance cancel each other out at a power factor of 0.9 lagging. This is because the impedance of the transformer is a combination of resistance and reactance, and at a power factor of 0.9 lagging, the reactive power component is such that it cancels out the resistive power component.
Therefore, the correct answer is option C, 0.9 lagging.
The full load voltage drop in a 1-phase transformer can be divided into two components: voltage drop due to resistance and voltage drop due to leakage reactance.
Voltage drop due to resistance:
Resistance is the primary cause of voltage drop in a transformer. When a load is connected to the secondary side of the transformer, the current flows through the winding resistance, which causes a voltage drop. The magnitude of this voltage drop is proportional to the current flowing through the winding and the resistance of the winding.
Voltage drop due to leakage reactance:
Leakage reactance is another factor that contributes to the voltage drop in a transformer. Leakage reactance is caused by the magnetic flux that does not link with both the primary and secondary windings. This flux leakage induces a voltage drop across the winding reactance. The magnitude of this voltage drop is proportional to the current flowing through the winding and the reactance of the winding.
Total voltage drop:
The total voltage drop in a transformer is the sum of the voltage drop due to resistance and the voltage drop due to leakage reactance.
Given that the full load voltage drop in the transformer is 2% and 4% respectively due to resistance and leakage reactance, we can write the following equation:
Total voltage drop = Voltage drop due to resistance + Voltage drop due to leakage reactance
2% = Voltage drop due to resistance
4% = Voltage drop due to leakage reactance
Since the voltage drop is zero at a power factor of 0.9 lagging, it means that the voltage drop due to resistance and the voltage drop due to leakage reactance cancel each other out at a power factor of 0.9 lagging. This is because the impedance of the transformer is a combination of resistance and reactance, and at a power factor of 0.9 lagging, the reactive power component is such that it cancels out the resistive power component.
Therefore, the correct answer is option C, 0.9 lagging.
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The full load voltage drop in a 1-phase transformer is 2% and 4% respectively due to resistance and leakage reactance. Then the voltage drop is zero at __________a)0.45 laggingb)0.45 leadingc)0.9 laggingd)0.9 leadingCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2026 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The full load voltage drop in a 1-phase transformer is 2% and 4% respectively due to resistance and leakage reactance. Then the voltage drop is zero at __________a)0.45 laggingb)0.45 leadingc)0.9 laggingd)0.9 leadingCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The full load voltage drop in a 1-phase transformer is 2% and 4% respectively due to resistance and leakage reactance. Then the voltage drop is zero at __________a)0.45 laggingb)0.45 leadingc)0.9 laggingd)0.9 leadingCorrect answer is option 'C'. Can you explain this answer?.
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