JEE Physics

StemEZ

Chapter 40

Experiment - To Study The Characteristics Of A Common Emitter N-P-N (Or P-N-P) Transistor And To Find Out The Values Of Current And Voltage Gains. - all with Video Answers

Educators

Chapter Questions

Problem 2927

In a common emitter amplifier, using output resistance of $5000 \Omega$ and input resistance of $2000 \Omega$, if the peak value of input signal voltage is $10 \mathrm{mV}$ and $\beta=50$ then what is the peak value of output voltage?
(A) $2.5 \times 10^{-4}$ Volt
(B) $5 \times 10^{-6}$ Volt
(C) $1.25$ Volt
(D) 125 Volt

Narayan Hari

Narayan Hari

Numerade Educator

Problem 2928

A transistor is connected in common emitter configuration. The collector supply is $8 \mathrm{~V}$ and the voltage drop across a resistor of 800 in the collector circuit is $0.5 \mathrm{~V}$. If the current gain factor $\alpha$ is $0.96$, then base current will be
(A) $27 \mu \mathrm{A}$
(B) $26 \mu \mathrm{A}$
(C) $25 \mu \mathrm{A}$
(D) $24 \mu \mathrm{A}$

Narayan Hari

Numerade Educator

Problem 2929

In a transistor, a change of $8.0 \mathrm{~mA}$ in the emitter current produces a change of $7.8 \mathrm{~mA}$ in the collector current. What change in the base current is necessary to produce the same change in the collector current?
(A) $300 \mu \mathrm{A}$
(B) $400 \mu \mathrm{A}$
(C) $200 \mu \mathrm{A}$
(D) $100 \mu \mathrm{A}$

Narayan Hari

Numerade Educator

Problem 2930

In a transistor amplifier, $\beta=62, \mathrm{R}_{\mathrm{L}}=5000 \Omega$ and internal resistance of the transistor is $500 \Omega$. What will be the ratio of power amplification to voltage amplification?
(A) 61
(B) 62
(C) 60
(D) 100

Narayan Hari

Numerade Educator

Problem 2931

The current gain of a transistor in common base mode is 0.99. To change the emitter current by $5 \mathrm{~mA}$. What will be the necessary change in collector current ?
(A) $5.1 \mathrm{~mA}$
(B) $4.95 \mathrm{~mA}$
(C) $2.45 \mathrm{~mA}$
(D) $0.196 \mathrm{~mA}$

Narayan Hari

Numerade Educator

Problem 2932

In a common base amplifier circuit, calculate the change in base current if that in the collector current is $2 \mathrm{~mA}$ and $\alpha=0.98$.
(A) $980 \mathrm{~mA}$
(B) $2 \mathrm{~mA}$
(C) $0.04 \mathrm{~mA}$
(D) $1.96 \mathrm{~mA}$

Narayan Hari

Numerade Educator

Problem 2933

The current gain of a transistor is $100 .$ If the base current changes by $200 \mu \mathrm{A}$, What is the change in collector current?
(A) $20 \mathrm{~mA}$
(B) $200 \mathrm{~mA}$
(C) $2 \mathrm{~mA}$
(D) $0.2 \mathrm{~mA}$

Narayan Hari

Numerade Educator

Problem 2934

Which of the following the correct relationship between two current gains $\alpha$ and $\beta$ in a transistor?
(A) $\beta=[(1+\alpha) / \alpha]$
(B) $\beta=[\alpha /(1+\alpha)]$
(C) $\alpha=[(1+\beta) / \beta]$
(D) $\alpha=[\beta /(1+\beta)]$

Narayan Hari

Numerade Educator

Problem 2935

What is the relation of the transistor current?
(A) $\mathrm{I}_{\mathrm{B}}=\mathrm{I}_{\mathrm{C}}+\mathrm{I}_{\mathrm{E}}$
(B) $\mathrm{I}_{\mathrm{C}}=\mathrm{I}_{\mathrm{E}}+\mathrm{I}_{\mathrm{B}}$
(C) $\mathrm{I}_{\mathrm{E}}=\mathrm{I}_{\mathrm{C}}+\mathrm{I}_{\mathrm{B}}$
(D) $\mathrm{I}_{\mathrm{C}}=\mathrm{I}_{\mathrm{E}}+\mathrm{I}_{\mathrm{B}}$

Narayan Hari

Numerade Educator