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It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.
W1: 250 V, 10 A, Low Power Factor
W2: 250 V, 5 A, Low Power Factor
W3: 150 V, 10 A, High Power Factor
W4: 150 V, 5 A, High Power Factor
The wattmeters used in open circuit test and short circuit test of the transformer will respectively be
- a)W1 and W2
- b)W2and W4
- c)W1 and W4
- d)W2 and W3
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
It is desired to measure the parameters of 230V/115V, 2kVA, single pha...
Measurement of Transformer Parameters Using Wattmeters
Open Circuit Test:
- Wattmeter W2 and W3 are not suitable as they have low power factor and high power factor respectively which will not give accurate readings for open circuit test.
- Wattmeter W1 can be used as it can measure up to 250V and 10A, which is suitable for measuring the voltage and current of the high voltage winding of the transformer during open circuit test.
- Wattmeter W4 can also be used as it can measure up to 150V and 5A, which is suitable for measuring the voltage and current of the low voltage winding of the transformer during open circuit test.
- Therefore, the wattmeters used in open circuit test of the transformer will be W1 and W4.
Short Circuit Test:
- Wattmeter W1 is not suitable for short circuit test as it can measure up to 250V and 10A, which is too high for measuring the voltage and current of the low voltage winding of the transformer during short circuit test.
- Wattmeter W4 is also not suitable for short circuit test as it can measure up to 150V and 5A, which is too low for measuring the voltage and current of the high voltage winding of the transformer during short circuit test.
- Wattmeter W2 can be used as it can measure up to 250V and 5A, which is suitable for measuring the voltage and current of the high voltage winding of the transformer during short circuit test.
- Wattmeter W3 can also be used as it can measure up to 150V and 10A, which is suitable for measuring the voltage and current of the low voltage winding of the transformer during short circuit test.
- Therefore, the wattmeters used in short circuit test of the transformer will be W2 and W3.
Conclusion:
- The suitable wattmeters for open circuit test of the transformer are W1 and W4, while the suitable wattmeters for short circuit test of the transformer are W2 and W3.
- Therefore, the correct answer is option D.
Open Circuit Test:
- Wattmeter W2 and W3 are not suitable as they have low power factor and high power factor respectively which will not give accurate readings for open circuit test.
- Wattmeter W1 can be used as it can measure up to 250V and 10A, which is suitable for measuring the voltage and current of the high voltage winding of the transformer during open circuit test.
- Wattmeter W4 can also be used as it can measure up to 150V and 5A, which is suitable for measuring the voltage and current of the low voltage winding of the transformer during open circuit test.
- Therefore, the wattmeters used in open circuit test of the transformer will be W1 and W4.
Short Circuit Test:
- Wattmeter W1 is not suitable for short circuit test as it can measure up to 250V and 10A, which is too high for measuring the voltage and current of the low voltage winding of the transformer during short circuit test.
- Wattmeter W4 is also not suitable for short circuit test as it can measure up to 150V and 5A, which is too low for measuring the voltage and current of the high voltage winding of the transformer during short circuit test.
- Wattmeter W2 can be used as it can measure up to 250V and 5A, which is suitable for measuring the voltage and current of the high voltage winding of the transformer during short circuit test.
- Wattmeter W3 can also be used as it can measure up to 150V and 10A, which is suitable for measuring the voltage and current of the low voltage winding of the transformer during short circuit test.
- Therefore, the wattmeters used in short circuit test of the transformer will be W2 and W3.
Conclusion:
- The suitable wattmeters for open circuit test of the transformer are W1 and W4, while the suitable wattmeters for short circuit test of the transformer are W2 and W3.
- Therefore, the correct answer is option D.
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Community Answer
It is desired to measure the parameters of 230V/115V, 2kVA, single pha...
The current is of 4 to 8% of full load current ≌ 1.4 A, and is of low power factor ≌ 0.2.
∴ W2 is required.
For short circuit test [on HV side],
The current is full load current ≌ 8.7 A.
The power factor is high ≌ 0.5 to 0.6.
∴ W3 is required.
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It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. 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 It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. 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 It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. Can you explain this answer?.
It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. 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 It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. 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 It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. Can you explain this answer?.
Solutions for It is desired to measure the parameters of 230V/115V, 2kVA, single phase transformer. The following wattmeters are available in a laboratory.W1: 250 V, 10 A, Low Power FactorW2: 250 V, 5 A, Low Power FactorW3: 150 V, 10 A, High Power FactorW4: 150 V, 5 A, High Power FactorThe wattmeters used in open circuit test and short circuit test of the transformer will respectively bea)W1 and W2b)W2and W4c)W1 and W4d)W2 and W3Correct answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE).
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