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Transistor Analysis Exercises

This document contains 15 questions about electronics and transistors. It asks the reader to determine various currents, voltages, and properties like beta and alpha for different transistor circuits. It also asks the reader to determine if transistors are saturated in some circuits and calculates values like power dissipation and required resistor values.

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Ahmed Abo n
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178 views4 pages

Transistor Analysis Exercises

This document contains 15 questions about electronics and transistors. It asks the reader to determine various currents, voltages, and properties like beta and alpha for different transistor circuits. It also asks the reader to determine if transistors are saturated in some circuits and calculates values like power dissipation and required resistor values.

Uploaded by

Ahmed Abo n
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Electronics Sheet 4 Spring 2022

Answer the following questions:


Q1 A base current of 50 µA is applied to
the transistor in the following Figure,
and a voltage of 5 V is dropped
across RC.
a. Determine the βDC of the transistor.
b. Calculate αDC for the transistor

Q2 Assume that the transistor in the


circuit of Figure is replaced with one
having a βdc of 200. Determine IB, IC,
IE, and VCE given that VCC = 10 V and
VBB = 3 V.

Q3 Determine each current in following


Figure. What is the βDC?

Q4 In both circuits of the following Figure. Find VCE, VBE, and VCB.

Q5 Determine whether or not the transistors in the following Figure are


saturated.
Electronics Sheet 4 Spring 2022

Q6 Find IB, IE, and IC in the following


Figure. αDC = 0.98

Q7 The power dissipation derating factor for a certain transistor is 1 mW/°C.


The PD(max) is 0.5 W at 25°C. What is PD(max) at 75°C?

Q8 Determine the terminal voltages of each transistor with respect to ground


for each circuit in the following Figure. Also determine VCE, VBE, and
VCB.
Electronics Sheet 4 Spring 2022
Q9 If the βDC in following Figure
changes from 100 to 150 due to a
temperature increase, what is the
change in collector current?

Q10 A 50 mV signal is applied to the base of a properly biased transistor with


r’e = 10 Ω and RC = 560 Ω. Determine the signal voltage at the collector.

Q11 Determine the value of the collector resistor in an npn transistor amplifier
with βDC = 250, VBB = 2.5 V, VCC = 9 V, VCE =4 V, and RB =100 kΩ.

Q12 Determine the emitter current in the


phototransistor circuit in following
Figure if, for each lm/m2 of light
intensity, 1 μA of base current is
produced in the phototransistor.

Q13 A certain phototransistor in a circuit has a βDC = 200. If Iλ = 100 μA, what
is the collector current?

Q14 Determine IC(sat) for the transistor in


following Figure.
What is the value of IB necessary to produce
saturation?
What minimum value of VIN is necessary for
saturation?
Assume VCE(sat) = 0 V.
Electronics Sheet 4 Spring 2022
Q15 The transistor in following Figure has a βDC
of 50. Determine the value of RB required to
ensure saturation when VIN is 5 V. What
must VIN be to cut off the transistor?
Assume VCE(sat) = 0 V.

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