Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > Per unit impedance is equal toa)base impedanc...
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Per unit impedance is equal to
- a)base impedance / actual impedance
- b)actual impedance / base impedance
- c)base MVA / base current
- d)base current / base MVA
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Per unit impedance is equal toa)base impedance / actual impedanceb)act...
Explanation:
In electrical engineering, the concept of per unit impedance is used to normalize the impedance values with respect to a base value. It allows for easy comparison and calculation of electrical quantities in power systems.
Definition of Per Unit Impedance:
Per unit impedance is defined as the ratio of the actual impedance to the base impedance.
Formula:
Per unit impedance = Actual impedance / Base impedance
Explanation of the options:
a) base impedance / actual impedance:
This option is incorrect because it is the inverse of the correct formula. The base impedance should be in the numerator and the actual impedance in the denominator.
b) actual impedance / base impedance:
This option is correct. It follows the formula for calculating per unit impedance. The actual impedance is divided by the base impedance to obtain the per unit impedance value.
c) base MVA / base current:
This option is unrelated to the calculation of per unit impedance. It involves the concept of per unit power and per unit current. It is not applicable to find the per unit impedance.
d) base current / base MVA:
This option is also unrelated to the calculation of per unit impedance. It involves the concept of per unit current and per unit power. It is not applicable to find the per unit impedance.
Conclusion:
The correct option is b) actual impedance / base impedance. This formula correctly calculates the per unit impedance, which is used to normalize impedance values in power systems.
In electrical engineering, the concept of per unit impedance is used to normalize the impedance values with respect to a base value. It allows for easy comparison and calculation of electrical quantities in power systems.
Definition of Per Unit Impedance:
Per unit impedance is defined as the ratio of the actual impedance to the base impedance.
Formula:
Per unit impedance = Actual impedance / Base impedance
Explanation of the options:
a) base impedance / actual impedance:
This option is incorrect because it is the inverse of the correct formula. The base impedance should be in the numerator and the actual impedance in the denominator.
b) actual impedance / base impedance:
This option is correct. It follows the formula for calculating per unit impedance. The actual impedance is divided by the base impedance to obtain the per unit impedance value.
c) base MVA / base current:
This option is unrelated to the calculation of per unit impedance. It involves the concept of per unit power and per unit current. It is not applicable to find the per unit impedance.
d) base current / base MVA:
This option is also unrelated to the calculation of per unit impedance. It involves the concept of per unit current and per unit power. It is not applicable to find the per unit impedance.
Conclusion:
The correct option is b) actual impedance / base impedance. This formula correctly calculates the per unit impedance, which is used to normalize impedance values in power systems.
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Community Answer
Per unit impedance is equal toa)base impedance / actual impedanceb)act...
Per unit value of a quantity is defined as the ratio of its actual value to its base value.
Per unit impedance = actual impedance / base impedance
Important Point:
The relation between new per-unit value & old per unit value impedance
Where,
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
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Question Description
Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. 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 Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. 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 Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. Can you explain this answer?.
Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. 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 Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. 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 Per unit impedance is equal toa)base impedance / actual impedanceb)actual impedance / base impedancec)base MVA / base currentd)base current / base MVACorrect answer is option 'B'. Can you explain this answer?.
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