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Recent questions tagged transistors

A transistor is connected in common emitter mode. In the collector circuit the voltage drop across the resistor of $800 \; \Omega$ is $0.5 V$ . If current gain $\alpha$ is $0.96$ What is base current

asked Jan 31, 2014 by meena.p

1 answer

For a given transistor, the value of the forward transfer ratio $\beta =50$. Calculatethe ratio of change in collector current to the change in emitter current.

asked Jan 28, 2014 by meena.p

1 answer

The emitter current in a transistor is $ 1mA$ If $\alpha =0.95$ value of base current is :

asked Jan 28, 2014 by meena.p

1 answer

The transconductance of a transistor used as an amplifier in common emitter mode is $0.1 \;mho.$ When a signal of 10 mv is added to base emitter voltage change in collector current is

asked Jan 28, 2014 by meena.p

1 answer

Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.

asked Jan 28, 2014 by meena.p

1 answer

A change of 10 mA in the emitter current produces a change of 7.5 mA in collector current in a transistor . What should be change in base current to produce the same change in collector current.

asked Jan 28, 2014 by meena.p

1 answer

A transistor in common emitted mode the load resistance is $2k \Omega$ and the current gain $\beta =50,$ What is the power if input resistance is $500 \Omega$

asked Jan 28, 2014 by meena.p

1 answer

When negative voltage feedback is applied to an amplifier of gain 150, the overall gain falls to 15. Find the fraction of the output that is feedback to the input.

asked Jan 28, 2014 by meena.p

1 answer

In an amplifier, negative feedback is introduced with feedback fraction $\beta =0.01$. If voltage given with out negative feed back. is $2500$ what is voltage gain with negative feed back.

asked Jan 28, 2014 by meena.p

1 answer

In an n-p-n transistor only $3 \%$ of the charge carriers are allerved to recombine in the base region. The value of $ \alpha$ is

asked Jan 28, 2014 by meena.p

1 answer

What is the emitter current $I_E$ in a transfer where base current $I_B$ is $20 \mu A$ and $\beta =40$

asked Jan 28, 2014 by meena.p

1 answer

What is the output resistance, When we observe in a common emitter circuit the collector current increase from $9.5 \;mA\;to 10\;mA$ When the collector voltage increase from $2.5 \;to \;6v$ When base current is kept constant .

asked Jan 28, 2014 by meena.p

1 answer

In a common base amplifier current gain is $0.96$ and emitter current is $7.2\;mA$. The base current is

asked Jan 28, 2014 by meena.p

1 answer

In a common emitter transistor the current gain is 80. What is change in collector current , when change in base current is $250 \mu A$

asked Jan 28, 2014 by meena.p

1 answer

In the use of transistor as an amplifier $I_f \alpha =\large\frac{I_c}{I_e}$ and $\beta =\large\frac{I_c}{I_b}$ where $I_c$- collector current $I_b$- base current $I_e$- emitter current then

asked Jan 28, 2014 by meena.p

1 answer

Which of the following are incorrect statements about a transistor?

asked Jan 27, 2014 by meena.p

1 answer

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