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BJT Numericals

This document contains 19 questions related to calculating values and determining operating modes for bipolar junction transistors in various circuit configurations. The questions involve calculating currents, voltages, resistor values, and parameters like beta, alpha and early voltage based on information provided about the transistor characteristics and biasing conditions in each circuit.

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Tina Erin
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1K views5 pages

BJT Numericals

This document contains 19 questions related to calculating values and determining operating modes for bipolar junction transistors in various circuit configurations. The questions involve calculating currents, voltages, resistor values, and parameters like beta, alpha and early voltage based on information provided about the transistor characteristics and biasing conditions in each circuit.

Uploaded by

Tina Erin
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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1. In a common base connection, I = 1mA, I = 0.95mA. Calculate the value of I .

2. A certain transistor has 𝛽 of 180. If the collector current is 15mA, what is the value of base current?
What is the value of α.

3. For an NPN BJT operating in active mode: Assuming I =10mA, I =100uA, I =9.8mA and
I =1uA. Calculate: Base transport factor and emitter injection efficiency.

4. For an NPN transistor about 7% of the electrons entering the base from the emitter recombine with the
holes. This results in the collector current being 18.6mA. Calculate the emitter current and the current
gain.

5. The leakage currents of a transistor are I = 0.5𝑢𝐴 and I = 40uA and I = 100uA. Find I .
6. The emitter current and the base current of a npn BJT are 1.46mA and 14.46uA respectively. Calculate
the saturation current Is if V = 0.7V.

7. A given npn BJT (Early voltage is 100 V) is biased with a collector current of 7mA. What is ro?

8. Find 𝛽 .

9. Reverse saturation current = 0.007pA.


V = 2 𝑉. Determine the maximum value
of RC that permits the operation of
transistor in active region.
Type equationthe
10. Determine here.
operating From circuit diagram, V = V = 5 V and V = 0 V
mode of operation of BJT
𝑉 = V − V = 5 V > 0.7V J is Forward biased

𝑉 = 0 J is Reversed biased

∴ BJT is operating in forward active mode

11. Find the operating point of below


circuit

12. Find the operating point of below


circuit

13. Calculate the value of V

𝛃 = 𝟏𝟎𝟎
14.
14. Determine β, V , R

15. In the circuit shown below 𝐕𝐂𝐄(𝐬𝐚𝐭) = 𝟎. 𝟐 𝐕,

β=100 and I = 20 μA. Calculate V

16. Determine the value of 𝑅 required to


ensure saturation when V is 5V. Assume
𝐕𝐂𝐄(𝐬𝐚𝐭) = 𝟎𝐕.
17. Determine the mode of operation of
BJT?

18. Determine the mode of operation of


BJT?

19. Determine operating point of given circuit.

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