Slope relation of AC & DC load lines

Q.  The slope of AC load line is usually ____________
- Published on 23 Sep 15

a. Higher than slope of DC load line
b. Smaller than slope of DC load line
c. Similar as that of DC load line
d. None of the above

ANSWER: Higher than slope of DC load line

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    Discussion

  • Satyawati   -Posted on 25 Sep 15
    During an analysis of AC load line using a partial amplifier circuit, AC & DC load resistances are given by Rc || RL and Rc respectively. Hence, the slope of AC load line would be -1 / (Rc || RL ) & it is generally adopted specifically when the transistor is applicable as an amplifier.
    On the contrary, the slope of DC load line would be ultimately -1 / Rc. By evaluating the slopes of AC & DC load lines, it becomes obvious that the parallel combination (Rc || RL ) is always less than Rc.
    Therefore, the slope of AC load line is always greater than that of DC load line.

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