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In a common emitter transistor amplifier the audio signal voltage across the collector is 3V. The resistance of collector is $3 k Ω$ . If the current gain is 100 and the base resistance is $2 k Ω$ , the voltage and power gain of the amplifier is

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20 and 200

200 and 1000

15 and 200

150 and 15000

answer is D.

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Detailed Solution

$Voltage gain = (current gain) [\frac{R_{output}}{R_{input}}]$

= $100 [\frac{3000}{2000}]$ = 150

Power gain = (Current gain) (Voltage gain)

= 100 (150)= 15000

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