What is the theoretical duty cycle of a symmetrical astable multivibrator producing a square wave?

Multiple Choice Options

A
50%
✓ Correct Option
B
25%
C
75%
D
100%

Detailed Technical Solution & Explanation

In a symmetrical astable multivibrator, the time intervals during which the output is high ( $T_{high}$ ) and low ( $T_{low}$ ) are equal ( $T_{high} = T_{low} = 0.693 R C$ ).

The duty cycle is given by:

\text{Duty Cycle} = \frac{T_{high}}{T_{high} + T_{low}} \times 100\% = \frac{T}{2T} \times 100\% = 50\%

Option Analysis:

•

Option A (50%): Correct; definition of a symmetrical square wave.

•

Option B (25%): Incorrect; represents an asymmetrical duty ratio.

•

Option C (75%): Incorrect; asymmetrical ratio.

•

Option D (100%): Incorrect; continuous DC high signal.

Reference: Demo2 · Set 2NEC Licensure Syllabus

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ACtE08 · Chapter 8Demo2 · Set 2🏛️ Past Licensure QuestionID: 10f4c97b