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The reactance of a generator designated ‘x’ is given as 0.25 pu based on the generator’s name plate rating of 18 kV, 500 MVA. If the base for calculations is changed to 20 kV, 100 MVA, the generator reactance X on new base will be - (in pu)
  • a)
    1.025 pu
  • b)
    0.05 pu
  • c)
    0.0405 pu
  • d)
    0.25 pu
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The reactance of a generator designated ‘x’ is given as 0....
Concept:
The relation between new per-unit value & old per unit value impedance


Where,
(Zpu)new = New per unit value of impedance
(Zpu)old = Old per unit value of impedance
kVbase = Old base value of voltage
kVnew = New base value of voltage
MVAnew = New base value of power
MVAold = Old base value of power
Calculation:
Given that,
Xold = 0.25 PU
MVAold = 500 MVA
KVold = 18 kV
MVAnew = 100 MVA
KVnew = 20 kV
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Community Answer
The reactance of a generator designated ‘x’ is given as 0....
By Xg is a measure of its opposition to the flow of alternating current. It is caused by the inductance and capacitance of the generator's windings and is typically expressed in ohms (Ω). The reactance of a generator is frequency-dependent and can be calculated using the formula Xg = 2πfL - 1/(2πfC), where f is the frequency of the alternating current, L is the inductance of the generator's windings, and C is the capacitance of the generator's windings.
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The reactance of a generator designated ‘x’ is given as 0.25 pu based on the generator’s name plate rating of 18 kV, 500 MVA. If the base for calculations is changed to 20 kV, 100 MVA, the generator reactance X on new base will be - (in pu)a)1.025 pub)0.05 puc)0.0405 pud)0.25 puCorrect 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 reactance of a generator designated ‘x’ is given as 0.25 pu based on the generator’s name plate rating of 18 kV, 500 MVA. If the base for calculations is changed to 20 kV, 100 MVA, the generator reactance X on new base will be - (in pu)a)1.025 pub)0.05 puc)0.0405 pud)0.25 puCorrect 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 reactance of a generator designated ‘x’ is given as 0.25 pu based on the generator’s name plate rating of 18 kV, 500 MVA. If the base for calculations is changed to 20 kV, 100 MVA, the generator reactance X on new base will be - (in pu)a)1.025 pub)0.05 puc)0.0405 pud)0.25 puCorrect answer is option 'C'. Can you explain this answer?.
Solutions for The reactance of a generator designated ‘x’ is given as 0.25 pu based on the generator’s name plate rating of 18 kV, 500 MVA. If the base for calculations is changed to 20 kV, 100 MVA, the generator reactance X on new base will be - (in pu)a)1.025 pub)0.05 puc)0.0405 pud)0.25 puCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
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