Boylestad: MCQ in Bipolar Junction Transistors
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July 27, 2019
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(Last Updated On: November 9, 2020)
This is the Multiple Choice Questions in Bipolar Junction Transistors from the book
Electronic Devices and Circuit Theory 10th Edition by Robert L. Boylestad. If you are
looking for a reviewer in Electronics Engineering this will definitely help. I can assure you
that this will be a great help in reviewing the book in preparation for your Board Exam.
Make sure to familiarize each and every questions to increase the chance of passing the
ECE Board Exam.
Online Questions and Answers Topic Outline
MCQ in Transistor Construction
MCQ in Transistor Operation
MCQ in Common-Base Configuration
MCQ in Transistor Amplifying Action
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MCQ in Common-Emitter Configuration
MCQ in Common-Collector Configuration
MCQ in Limits of Operation
MCQ in Transistor Specification Sheet
MCQ in Transistor Testing
MCQ in Transistor Casing and Terminal Identification
Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. In what decade was the first transistor created?
A) 1930s
B) 1940s
C) 1950s
D) 1960s
View Answer:
Answer: Option B
Solution:
2. How many layers of material does a transistor have?
A) 1
B) 2
C) 3
D) 4
View Answer:
Answer: Option C
Solution:
3. What is the ratio of the total width to that of the center layer for a transistor?
A) 1:15
B) 1:150
C) 15:1
D) 150:1
View Answer:
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Answer: Option D
Solution:
4. Which of the following is (are) the terminal(s) of a transistor?
A) Emitter
B) Base
C) Collector
D) All of the above
View Answer:
Answer: Option D
Solution:
5. List the types of bipolar junction transistors.
A) ppn, npn
B) pnp, npn
C) npp, ppn
D) nnp, pnp
View Answer:
Answer: Option B
Solution:
6. Transistors are _______-terminal devices.
A) 2
B) 3
C) 4
D) 5
View Answer:
Answer: Option B
Solution:
7. How many carriers participate in the injection process of a unipolar device?
A) 1
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B) 2
C) 0
D) 3
View Answer:
Answer: Option A
Solution:
8. Which component of the collector current IC is called the leakage current?
A) Majority
B) Independent
C) Minority
D) None of the above
View Answer:
Answer: Option C
Solution:
9. For a properly biased pnp transistor, let IC = 10 mA and IE = 10.2 mA. What is the level
of IB?
A) 0.2 A
B) 200 mA
C) 200 µA
D) 20.2 mA
View Answer:
Answer: Option C
Solution:
10. Calculate minority current ICO if IC = 20.002 mA and IC majority = 20 mA.
A) 2 µA
B) 0.002 µA
C) 2 nA
D) 2 pA
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View Answer:
Answer: Option A
Solution:
11. Which of the following regions is (are) part of the output characteristics of a transistor?
A) Active
B) Cutoff
C) Saturation
D) All of the above
View Answer:
Answer: Option D
Solution:
12. In which region are both the collector-base and base-emitter junctions forwardbiased?
A) Active
B) Cutoff
C) Saturation
D) All of the above
View Answer:
Answer: Option C
Solution:
13. How much is the base-to-emitter voltage of a transistor in the “on” state?
A) 0 V
B) 0.7 V
C) 0.7 mV
D) Undefined
View Answer:
Answer: Option B
Solution:
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14. In the active region, while the collector-base junction is ______-biased, the baseemitter is ______-biased.
A) forward, forward
B) forward, reverse
C) reverse, forward
D) reverse, reverse
View Answer:
Answer: Option C
Solution:
15. What is βdc equal to?
A) IB / IE
B) IC / IE
C) IC / IB
D) None of the above
View Answer:
Answer: Option C
Solution:
16. What are the ranges of the ac input and output resistance for a common-base
configuration?
A) 10 Ω–100 Ω, 50 kΩ–1 MΩ
B) 50 kΩ–1 MΩ, 10 Ω–100 Ω
C) 10 Ω–100 kΩ, 50 Ω–1 kΩ
D) None of the above
View Answer:
Answer: Option A
Solution:
17. For what kind of amplifications can the active region of the common-emitter
configuration be used?
A) Voltage
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B) Current
C) Power
D) All of the above
View Answer:
Answer: Option D
Solution:
18. Use this table of collector characteristics to calculate βac at VCE = 15 V and IB = 30
µA.
A) 100
B) 106
C) 50
D) 400
View Answer:
Answer: Option A
Solution:
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19. Calculate βdc at VCE = 15 V and IB = 30 µA.
A) 100
B) 116
C) 50
D) 110
View Answer:
Answer: Option D
Solution:
20. Which of the following configurations can a transistor set up?
A) Common-base
B) Common-emitter
C) Common-collector
D) All of the above
View Answer:
Answer: Option D
Solution:
21. Determine the value of α when β = 100.
A) 1.01
B) 101
C) 0.99
D) Cannot be solved with the information provided
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View Answer:
Answer: Option C
Solution:
22. What is the most frequently encountered transistor configuration?
A) Common-base
B) Common-collector
C) Common-emitter
D) Emitter-collector
View Answer:
Answer: Option C
Solution:
23. βdc for this set of collector characteristics is within _____ percent of βac.
A) 2
B) 5
C) 7
D) 10
View Answer:
Answer: Option D
Solution:
24. βdc = ________
A) IB / IE
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B) IC / IE
C) IC / IB
D) None of the above
View Answer:
Answer: Option C
Solution:
25. What is (are) the component(s) of most specification sheets provided by the
manufacturer?
A) Maximum ratings
B) Thermal characteristics
C) Electrical characteristics
D) All of the above
View Answer:
Answer: Option D
Solution:
26. What is (are) the component(s) of electrical characteristics on the specification
sheets?
A) On
B) Off
C) Small-signal characteristics
D) All of the above
View Answer:
Answer: Option D
Solution:
27. Most specification sheets are broken down into _______.
A) maximum ratings
B) thermal characteristics
C) electrical characteristics
D) All of the above
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View Answer:
Answer: Option D
Solution:
28. An example of a pnp silicon transistor is a 2N4123.
A) True
B) False
View Answer:
Answer: Option B
Solution:
29. Which of the following equipment can check the condition of a transistor?
A) Current tracer
B) Digital display meter (DDM)
C) Ohmmeter (VOM)
D) All of the above
View Answer:
Answer: Option D
Solution:
30. Which of the following can be obtained from the last scale factor of a curve tracer?
A) hFE
B) αdc
C) αac
D) βac
View Answer:
Answer: Option D
Solution:
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31. Calculate βac for IC = 15 mA and VCE = 5 V.
A) 200
B) 180
C) 220
D) None of the above
View Answer:
Answer: Option A
Solution:
32. What range of resistor values would you get when checking a transistor for forwardand reverse-biased conditions by an ohmmeter?
A) 100 Ω to a few kΩ, exceeding 100 kΩ
B) Exceeding 100 kΩ, 100 Ω to a few kΩ
C) Exceeding 100 kΩ, exceeding 100 kΩ
D) 100 Ω to a few kΩ, 100 Ω to a few kΩ
View Answer:
Answer: Option A
Solution:
33. What does a reading of a large or small resistance in forward- and reverse-biased
conditions indicate when checking a transistor using an ohmmeter?
A) Faulty device
B) Good device
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C) Bad ohmmeter
D) None of the above
View Answer:
Answer: Option A
Solution:
34. A transistor can be checked using a(n) _______.
A) curve tracer
B) digital meter
C) ohmmeter
D) Any of the above
View Answer:
Answer: Option D
Solution:
35. How many individual pnp silicon transistors can be housed in a 14-pin plastic dual-inline package?
A) 4
B) 7
C) 10
D) 14
View Answer:
Answer: Option A
Solution:
Fill-in-the-blanks Questions
1. All amplifiers should have at least _____ terminals with _____ terminal(s) controlling
the flow between _____ other terminal(s).
A) 2, 1, 1
B) 3, 1, 2
C) 3, 2, 1
D) 3, 0, 3
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View Answer:
Answer: Option B
Solution:
2. The outer layers of a transistor are _______ the sandwiched layer.
A) much smaller than
B) the same as
C) much larger than
D) None of the above
View Answer:
Answer: Option C
Solution:
3. The doping of the sandwiched layer is _______ that of the outer layers.
A) considerably less than
B) the same as
C) considerably more than
D) None of the above
View Answer:
Answer: Option A
Solution:
4. The lower doping level _______ the conductivity and _______ the resistivity of the
material.
A) increases, decreases
B) increases, increases
C) decreases, decreases
D) decreases, increases
View Answer:
Answer: Option D
Solution:
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5. The term bipolar reflects the fact that _______ and _______ participate in the injection
process into the oppositely polarized material.
A) holes, neutrons
B) holes, electrons
C) neutrons, electrons
D) None of the above
View Answer:
Answer: Option B
Solution:
6. One p-n junction of a transistor is _______-biased and the other one is _______biased in the active region.
A) reverse, reverse
B) forward, forward
C) reverse, forward
D) None of the above
View Answer:
Answer: Option C
Solution:
7. The magnitude of the base current is typically on the order of _______ as compared to
_______ for the emitter.
A) µA, µA
B) µA, mA
C) mA, µA
D) mA, mA
View Answer:
Answer: Option B
Solution:
8. The base current is the _______ of the emitter and collector currents.
A) sum
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B) difference
C) product
D) None of the above
View Answer:
Answer: Option B
Solution:
9. The _______ region is the region normally employed for linear (undistorted) amplifiers.
A) active
B) cutoff
C) saturation
D) All of the above
View Answer:
Answer: Option A
Solution:
10. In the cutoff region the collector-base junction is _______-biased and the base-emitter
junction is _______-biased for a transistor.
A) reverse, forward
B) forward, reverse
C) reverse, reverse
D) forward, forward
View Answer:
Answer: Option C
Solution:
11. In the saturation region the collector-base junction is _______-biased and the baseemitter junction is _______-biased for a transistor.
A) reverse, forward
B) forward, reverse
C) reverse, reverse
D) forward, forward
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View Answer:
Answer: Option D
Solution:
12. For practical transistors the level of alpha typically extends from _____ to _____ with
most approaching the higher end of the range.
A) 0.0, 1
B) 0.90, 0.998
C) 50, 400
D) None of the above
View Answer:
Answer: Option B
Solution:
13. Typical values of voltage amplification for the common-base configurations vary from
_______ and the current gain is always _______.
A) less than 1, 50 to 300
B) 50 to 300, larger than 1
C) 50 to 300, less than 1
D) larger than 1, 50 to 300
View Answer:
Answer: Option C
Solution:
14. If a value of beta.gif is specified for a particular transistor configuration it will normally
be used for _____ calculations.
A) ac
B) dc
C) ac and dc
D) None of the above
View Answer:
Answer: Option C
17/21
Solution:
15. The common-collector configuration has a ______ input impedance and a ______
output impedance.
A) low, high
B) high, low
C) high, high
D) low, low
View Answer:
Answer: Option B
Solution:
16. The active region of a transistor is bounded by the _______.
A) cutoff region
B) saturation region
C) power dissipation curve
D) All of the above
View Answer:
Answer: Option D
Solution:
17. The “on” and “off” characteristics refer to _____ limits while the small-signal
characteristics indicate the parameters of importance to _____ operation.
A) ac, dc
B) dc, ac
C) ac, dc and ac
D) dc and ac, dc
View Answer:
Answer: Option B
Solution:
18. The step function (per step) of a curve tracer reveals the scale for _______.
A) collector current IC
18/21
B) VCE voltage
C) base current IB
D) All of the above
View Answer:
Answer: Option C
Solution:
19. The level of _____ is determined and displayed by advanced digital meters.
A) VCE
B) IB
C) IC
D) βdc
View Answer:
Answer: Option D
Solution:
20. The level of _____ is determined and displayed by advanced digital meters if using
diode-testing mode.
A) VBE
B) IC
C) IB
D) IE
View Answer:
Answer: Option A
Solution:
21. When checking a transistor by ohmmeter, a relatively _______ resistance is displayed
for a forward-biased junction and ______ resistance for a reverse-biased junction.
A) low, very high
B) low, low
C) high, high
D) high, very low
19/21
View Answer:
Answer: Option A
Solution:
22. An OL indication on an advanced digital meter indicates _______ while checking a
transistor.
A) forward bias
B) reverse bias
C) definitely a defective transistor
D) None of the above
View Answer:
Answer: Option B
Solution:
23. If the positive lead of an ohmmeter is connected to the base and the negative lead to
the emitter, a low resistance reading would indicate a ______ transistor and a high
resistance reading would indicate a ______ transistor.
A) npn, pnp
B) pnp, npn
C) npn, npn
D) pnp, pnp
View Answer:
Answer: Option A
Solution:
24. The leads of a transistor are typically made of _______.
A) gold
B) aluminum
C) nickel
D) All of the above
View Answer:
Answer: Option B
20/21
Solution:
25. There is(are) _______ in the internal construction of a TO-92 package.
A) gold bond wires
B) a copper frame
C) epoxy encapsulation
D) All of the above
View Answer:
Answer: Option D
Solution:
Check your work.
Answer in Bipolar Junction Transistors
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Multiple Choice Questions in Electronic Devices and Circuit Theory
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