Question

The LC product of a tuned amplifier circuit require to generate a carrier wave of 1 MHz for amplitude modulation is

• A. 1.5 × 10-14 s
• B. 1.2 × 10-12 s
• C. 3.2 × 10-12 s
• D. 2.5 × 10-14 s

Answer 1

Answer: (D)

2.5 × 10-14 s

Answer 2

: Frequency of tuned amplifier is

$\upsilon = \frac{1}{2\pi\sqrt{LC}}$

As per question$\upsilon = 1MHz = 10^{6}Hz$

Or $10^{6} = \frac{1}{2\pi\sqrt{LC}}$

Or $LC = \frac{1}{4\pi^{2}(10^{6})^{2}} = 2.5 \times 10^{- 14}$s