Question

Match List - I with List - II.

List - I (Attributes)	List - II (Modulation System)
A. Power-efficient transmission of signals B. Most band-width efficient transmission of voice signals C. Simplest receiver structure D. Bandwidth efficient transmission of signals with significant DC component	I. Conventional AM II. FM III. VSB IV. SSB-SC

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

Hint:

Important modulation properties: \[ \text{SSB-SC} \rightarrow \text{Power efficient} \] \[ \text{FM} \rightarrow \text{Good voice quality} \] \[ \text{AM} \rightarrow \text{Simplest receiver} \] \[ \text{VSB} \rightarrow \text{Efficient for TV/DC signals} \]

Answer 1

The Correct Option is A

Concept: Different modulation techniques are selected depending upon:
• Power efficiency
• Bandwidth efficiency
• Noise performance
• Receiver complexity Important properties:
• SSB-SC is power efficient.
• FM provides efficient voice transmission with good noise immunity.
• Conventional AM has simplest receiver.
• VSB efficiently transmits signals containing low-frequency or DC components.

Step 1: Match power-efficient transmission. SSB-SC transmits:
• Only one sideband
• Suppressed carrier Thus:
• Power wastage is minimized. Hence: \[ A \rightarrow IV \]

Step 2: Match bandwidth-efficient voice transmission. FM provides:
• Excellent noise immunity
• High-quality voice transmission Thus: \[ B \rightarrow II \]

Step 3: Match simplest receiver structure. Conventional AM can be detected using: \[ \text{Envelope detector} \] which is extremely simple. Hence: \[ C \rightarrow I \]

Step 4: Match signals with significant DC component. VSB modulation is especially suitable for:
• Television signals
• Signals containing low-frequency/DC components Thus: \[ D \rightarrow III \]

Step 5: Write the final matching sequence. Therefore: \[ A-IV,\ B-II,\ C-I,\ D-III \] Hence, the correct option is: \[ \boxed{(A)\ A-IV,\ B-II,\ C-I,\ D-III} \]