Discussion
Match List – I with List – II and select the correct answer using codes given below :
| List – I | List – II |
|---|---|
| a. Duty cycle | 1. Variable voltage regulator |
| b. AGC | 2. Astable multivibrator |
| c. LM317 | 3. Voltage regulator |
| d. Crow-bar protection | 4. FET |
Codes : a b c d
Answer: D
The duty cycle is a property of the output of an astable multivibrator, so a matches 2. Automatic gain control in a receiver uses a FET as the variable element, so b matches 4. The LM317 is a variable voltage regulator, so c matches 1. A crow-bar protection circuit protects the load of a voltage regulator against overvoltage, so d matches 3. The code is 2 4 1 3. The code 3 4 1 2 swaps the first and last pairs, and 1 2 3 4 and 4 3 2 1 are wrong in every pair. The answer is 2 4 1 3.
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