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A dynamometer wattmeter is rated at 10A and 100V with a full scale reading of 1000 W. The inductance of the voltage circuit is 5mH and its resistance 3000 ohm. Voltage across the current coil is negligible. At 50 Hz and zero power factors, the error in the wattmeter at the VA reading will be:
  • a)
    0.325 W 
  • b)
    0.523 VA
  • c)
    0.575 VA
  • d)
    0.604 W 
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A dynamometer wattmeter is rated at 10A and 100V with a full scale rea...
Concept:
The error in the wattmeter at the VA reading is given by:
Er = sinϕ × tanβ × true power
where β = Impedance angle of pressure coil
ϕ  = Power factor angle
The impedance angle of the pressure coil is given by:

Calculation:
Given, cosϕ = 0
∴ sinϕ = 1
True power = 1000W
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Most Upvoted Answer
A dynamometer wattmeter is rated at 10A and 100V with a full scale rea...
Concept:
The error in the wattmeter at the VA reading is given by:
Er = sinϕ × tanβ × true power
where β = Impedance angle of pressure coil
ϕ  = Power factor angle
The impedance angle of the pressure coil is given by:

Calculation:
Given, cosϕ = 0
∴ sinϕ = 1
True power = 1000W
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A dynamometer wattmeter is rated at 10A and 100V with a full scale reading of 1000 W. The inductance of the voltage circuit is 5mH and its resistance 3000 ohm. Voltage across the current coil is negligible. At 50 Hz and zero power factors, the error in the wattmeter at the VA reading will be:a)0.325 Wb)0.523 VAc)0.575 VAd)0.604 WCorrect answer is option 'B'. Can you explain this answer?
Question Description
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