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In ‘two-wattmeter method’ of power calculation of a 3-phase balanced star connected system, what is the power factor of the system if both the wattmeters show a positive reading?
  • a)
    0
  • b)
    Greater than 0 but less than 0.5
  • c)
    0.5
  • d)
    Greater than 0.5 but less than 1
Correct answer is option 'D'. Can you explain this answer?
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In ‘two-wattmeter method’ of power calculation of a 3-phas...
In 2-wattmeter method. For all power factors between 0.5 to 1 both wattmeter’s show +ve reading.
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In ‘two-wattmeter method’ of power calculation of a 3-phas...
Power Factor Calculation in Two-Wattmeter Method:

Positive Reading in Both Wattmeters:
When both the wattmeters show a positive reading in a 3-phase balanced star connected system, it indicates that the system is inductive in nature.

Explanation:
- In a balanced 3-phase system, the total power is the sum of the power measured by both the wattmeters.
- If both wattmeters show a positive reading, it means that both the currents and voltages are lagging in phase, which is a characteristic of an inductive load.
- The power factor in an inductive load is between 0.5 and 1.

Power Factor Calculation:
- If both wattmeters show a positive reading, the power factor of the system will be greater than 0.5 but less than 1.
- This indicates that the system has a lagging power factor due to the inductive nature of the load.
- A power factor greater than 0.5 but less than 1 signifies that the load is drawing more reactive power compared to active power.
Therefore, in the two-wattmeter method of power calculation for a 3-phase balanced star connected system, if both the wattmeters show a positive reading, the power factor of the system will be greater than 0.5 but less than 1.
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In ‘two-wattmeter method’ of power calculation of a 3-phase balanced star connected system, what is the power factor of the system if both the wattmeters show a positive reading?a)0b)Greater than 0 but less than 0.5c)0.5d)Greater than 0.5 but less than 1Correct answer is option 'D'. Can you explain this answer?
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