# Receivers

### Explanation of question 3

In a TRF receiver the RF amplifier increases

1. the selectivity
2. the sensitivity
3. the selectivity and decreases the sensitivity
4. both the selectivity and sensitivity to loudspeaker

The answer is :- 4 The r.f. amplifier increases both the selectivity and the sensitivity. The required signal is selected by a tuned circuit and then amplified.

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