# Transmission lines (feeders)

### Explanation of question 11

In Fig. 20.2, if I = 3/4 and C and D are short-circuited, the impedance between A and B at a frequency of Hz will be

1. very low
2. 50
3. 300
4. very high

The answer is :- 4 A stub of length (where n is a whole number) will present at the operating frequency a high impedance when the other end is open-circuited and a low impedance when the other end is short-circuited. A stub of length , etc., will present at the operating frequency a low impedance when the other end is open-circuited and a high impedance when the other end is short-circuited.

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