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Exam question

Eclipse
Guys,

can anyone explain the how the following answer to this  question is derived ( its from an old test paper) which my son is doing, 

The maximum tabulated value of earth fault loop impedance for a circuit is: 1.65 ohms, if the resistance of the line to cpc of a new circuit is 1.13ohms  the maximum accepted external earth fault loop impedance is:

A. 0.52 OHMS

B. 0.45 OHMS

C. 0.35 OHMS

D.0.20 OHMS


The answer given to him is "D"  but no explanation as to how its worked out,

really appreciate any feedback!!
Parents
  • 0
    The question is simply not right.


    If it wants 0.2 ohms as the answer, it should ask for the maximum measured value of external earth fault loop impedance, and should state that the resistance of line and cpc is measured at 1.13 ohms. A correctly worded question could be:

    The maximum tabulated value of earth fault loop impedance for a circuit is: 1.65 ohms, if the resistance of the line to and cpc of a new circuit is measured as 1.13 ohms  the maximum accepted measured external earth fault loop impedance is:


Reply
  • 0
    The question is simply not right.


    If it wants 0.2 ohms as the answer, it should ask for the maximum measured value of external earth fault loop impedance, and should state that the resistance of line and cpc is measured at 1.13 ohms. A correctly worded question could be:

    The maximum tabulated value of earth fault loop impedance for a circuit is: 1.65 ohms, if the resistance of the line to and cpc of a new circuit is measured as 1.13 ohms  the maximum accepted measured external earth fault loop impedance is:


Children
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