Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Communication

Question:

Case : Read the passage and answer the question(s).

In a diode AM detector, the output circuit consists of R = 1 k\(\Omega\) and C = 10 pF. A carrier signal of 100 kHz is to be detected. 

If it is NOT good, what is the value of C that you would suggest ?

Options:

1 \(\mu\)F

1 nF

10 pF

It is good.

Correct Answer:

1 \(\mu\)F

Explanation:

Condition for demodulation : \(\tau\) >> Tc

\(\tau\) = R C ; T= \(\frac{1}{\nu_{c}}\)

R = 1 k\(\Omega\) ; C = 1 \(\mu\)F ; \(\nu\) = 100 kHz

\(\tau\) = 10-3 s ; T= 10-5 s

Since, \(\tau\) >> Tc