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The ohmic drop of a transformer is 1% while the reactance drop is 5% of the voltage. The regulation of the transformer at 0.8 power factor leading and 0.8 power factor lagging are respectively
  • a)
    2.2 % and -3.8%
  • b)
     -3.4% and 4.6 %
  • c)
    -2.2 % and 3.8%
  • d)
     3.4 % and -4.6 %
Correct answer is option 'C'. Can you explain this answer?
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To solve this problem, we need to understand the concept of voltage regulation in transformers. The voltage regulation of a transformer refers to the change in output voltage when the load on the transformer changes.

The voltage regulation can be calculated using the following formula:

Voltage Regulation = (V_no-load - V_full-load) / V_full-load * 100

Where:
V_no-load is the output voltage when there is no load connected to the transformer.
V_full-load is the output voltage when the transformer is operating at full load.

In this problem, we are given that the ohmic drop is 1% and the reactance drop is 5% of the voltage. Let's calculate the voltage regulation for both power factor leading and power factor lagging conditions.

1. Power Factor Leading:
In this case, the actual voltage drop in the transformer will be the sum of the ohmic drop and the reactance drop. So the total voltage drop will be 1% + 5% = 6% of the voltage.

Voltage Regulation = 6%

2. Power Factor Lagging:
In this case, the actual voltage drop in the transformer will be the difference between the ohmic drop and the reactance drop. So the total voltage drop will be 1% - 5% = -4% of the voltage.

Voltage Regulation = -4%

Therefore, the voltage regulation of the transformer at 0.8 power factor leading is 6% and at 0.8 power factor lagging is -4%.

Now let's look at the options given:
a) 2.2% and -3.8%
b) -3.4% and 4.6%
c) -2.2% and 3.8%
d) 3.4% and -4.6%

From our calculations, we can see that the correct answer is option c) -2.2% and 3.8%.
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The ohmic drop of a transformer is 1% while the reactance drop is 5% of the voltage. The regulation of the transformer at 0.8 power factor leading and 0.8 power factor lagging are respectivelya)2.2 % and -3.8%b)-3.4% and 4.6 %c)-2.2 % and 3.8%d)3.4 % and -4.6 %Correct answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 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 ohmic drop of a transformer is 1% while the reactance drop is 5% of the voltage. The regulation of the transformer at 0.8 power factor leading and 0.8 power factor lagging are respectivelya)2.2 % and -3.8%b)-3.4% and 4.6 %c)-2.2 % and 3.8%d)3.4 % and -4.6 %Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The ohmic drop of a transformer is 1% while the reactance drop is 5% of the voltage. The regulation of the transformer at 0.8 power factor leading and 0.8 power factor lagging are respectivelya)2.2 % and -3.8%b)-3.4% and 4.6 %c)-2.2 % and 3.8%d)3.4 % and -4.6 %Correct answer is option 'C'. Can you explain this answer?.
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