Question

Match the following: A: ASK, B: APK, C: PSK, D: FSK

• A. A-IV, B-I, C-II, D-III
• B. A-III, B-II, C-I, D-IV
• C. A-II, B-III, C-IV, D-I
• D. A-I, B-IV, C-III, D-II

Hint:

ASK changes amplitude, PSK changes phase and FSK changes frequency of the carrier signal.

Answer 1

The Correct Option is A

Concept: Digital modulation techniques modify one parameter of a carrier. \[ \text{ASK} \rightarrow \text{Amplitude} \] \[ \text{PSK} \rightarrow \text{Phase} \] \[ \text{FSK} \rightarrow \text{Frequency} \] \[ \text{APK} \rightarrow \text{Pulse Amplitude} \]

Step 1: Match the quantities.
\[ A \rightarrow IV \] \[ B \rightarrow I \] \[ C \rightarrow II \] \[ D \rightarrow III \]

Step 2: Select the correct option.
\[ \boxed{A-IV,\;B-I,\;C-II,\;D-III} \] Hence, \[ \boxed{\text{Correct Option (A)}} \]