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The coefficient of reflection of voltage for a short-circuited line is:


1. 1.0
2. 0
3. -1.0
4. 2.0

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Correct Answer - Option 3 : -1.0

Formulas for the Coefficients of reflection and refraction are as follows

\({v_{refraction}} = \frac{{2{Z_L}}}{{{Z_L} + {Z_C}}}\)   

 \({v_{reflection}} = \frac{{{Z_L} - {Z_C}}}{{{Z_L} + {Z_C}}}\)

\({i_{refraction}} = \frac{{2{Z_C}}}{{{Z_L} + {Z_C}}}\)   

 \({i_{reflection}} = \frac{{{Z_C} - {Z_L}}}{{{Z_L} + {Z_C}}} = - {v_{reflection}}\)

Where, ZL = Load impedance, ZC = Characteristic or Surge impedance of the line.

These coefficients values for open circuit, short circuit, and flat lines are given as

 

Open circuit line

(ZL = ∞)

Short circuit line

(ZL = 0)

Flat line

(ZL = ZC)

vrefraction

2

0

1

vreflection

1

-1

0

irefraction

0

2

1

ireflection

-1

1

0

 

so, the coefficient of reflection of voltage for a short-circuited line is: -1

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