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Power System Analysis and Design

Mulukutla S Sarma, J D Glover, Thomas Overbye

Computer Science

6th Edition · 925 pages

ISBN: 9781305632134

Chapter 4: Q7MCQ (page 220)

Question:A circle with diameter mil has an area of _______ c mil.

Short Answer

Expert verified

Answer

Therefore, the correct answer is .

Step by step solution

Find the area of circle with D in.

One inch equals 1000 mils, and 1 cmil equals $\frac{π}{4}$ sq mil.

Draw the conclusion

The area ofa circle with diameter can be computed as follows:

$A = (\frac{π}{4} d^{2} sq mil) (\frac{1 c mil}{\frac{π}{4} sq mil})$

Thus, thearea ofa circle with diameter $D in. = 1000 D mil = d mil$ is equal to $d^{2} c mil$ .

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Most popular questions from this chapter

Is Geometric Mean Distance (GMD) the same as Geometric Mean Radius (GMR)?

(a) Yes

(b) No

Question:In deriving expressions for capacitance for a balanced three-phase three wire line with equal phase spacing, the following relationships may have been used.

(i) Sum of positive-sequence charges, $q_{A} + q_{b} + q_{c} = 0$

(ii) The sum of the two line-to-line voltages $V_{ab} + V_{bc}$ is equal to three times the line-to-neutral voltage V_bn.

Which of the following is true?

(a) Both

(b) Only (i)

(d) None

Question: In a three-phase line, in order to avoid unequal phase inductances due to unbalanced flux linkages, what technique is used?

The capacitance per phase of a balanced three-phase overhead line is given by

$C = \frac{0.0389}{\log (\frac{GMD}{r})} \frac{μf}{mi - phase}$

For the line of Problem 4.24, determine the capacitive reactance per phase in $Ω . mi$ .

(a) In practice, one deals with the capacitive reactance of the line in ohms-mi to neutral. Show that Eq. (4.9.15) of the text can be rewritten as

$X_{c} = k' \log \frac{D}{r} o h m s - m i = x'_{d} + x'_{a}$

Where $x'_{d} = k' \log D$ is the capacitive reactance spacing factor

$x'_{d} = k' l o g \frac{1}{r}$ is the capacitive reactance at 1-ft spacing

role="math" localid="1655202080897" $k' = (4.1 \times 10^{6}) / f = 0.06833 \times 10^{6}$ at f=60Hz

(b) Determine the capacitive reactance in $Ω m i$ for a single-phase line of problem 4.14. if the spacing is doubled, how does the reactance change?

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Question:A circle with diameter mil has an area of _______ c mil.

Short Answer

Step by step solution

Find the area of circle with D in.

Draw the conclusion

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Most popular questions from this chapter

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