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If the readings of the two wattmeters are equal and positive in two wattmeter method, the load pf in a balanced 3-phase 3-wire circuit will be
- a)zero
- b)0.5
- c)0.866
- d)unity
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
If the readings of the two wattmeters are equal and positive in two wa...
Explanation:
Two Wattmeter Method:
In a balanced 3-phase 3-wire circuit, the power can be measured using two wattmeters. When the readings of the two wattmeters are equal and positive, it indicates that the system is balanced.
Power Factor (PF):
Power factor is the ratio of real power (W) to apparent power (VA) in a circuit. It is a measure of how effectively electrical power is being used. A power factor of 1 (unity) means all the power is being used effectively.
Relation between Power Factor and Wattmeter Readings:
- In a balanced 3-phase 3-wire circuit, if the readings of the two wattmeters are equal and positive, it implies that the power factor of the load is unity (1).
- This is because in a balanced system, the power factor can be calculated using the readings of the two wattmeters. When the readings are equal, it indicates a power factor of 1.
Conclusion:
Therefore, when the readings of the two wattmeters are equal and positive in the two wattmeter method, the load power factor in a balanced 3-phase 3-wire circuit will be unity (1).
Two Wattmeter Method:
In a balanced 3-phase 3-wire circuit, the power can be measured using two wattmeters. When the readings of the two wattmeters are equal and positive, it indicates that the system is balanced.
Power Factor (PF):
Power factor is the ratio of real power (W) to apparent power (VA) in a circuit. It is a measure of how effectively electrical power is being used. A power factor of 1 (unity) means all the power is being used effectively.
Relation between Power Factor and Wattmeter Readings:
- In a balanced 3-phase 3-wire circuit, if the readings of the two wattmeters are equal and positive, it implies that the power factor of the load is unity (1).
- This is because in a balanced system, the power factor can be calculated using the readings of the two wattmeters. When the readings are equal, it indicates a power factor of 1.
Conclusion:
Therefore, when the readings of the two wattmeters are equal and positive in the two wattmeter method, the load power factor in a balanced 3-phase 3-wire circuit will be unity (1).
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If the readings of the two wattmeters are equal and positive in two wattmeter method, the load pf in a balanced 3-phase 3-wire circuit will bea)zerob)0.5c)0.866d)unityCorrect answer is option 'D'. Can you explain this answer?
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