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# Boylestad: MCQ in Bipolar Junction Transistors

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
• 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

Solution:

2. How many layers of material does a transistor have?

A) 1

B) 2

C) 3

D) 4

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

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

Solution:

5. List the types of bipolar junction transistors.

A) ppn, npn

B) pnp, npn

C) npp, ppn

D) nnp, pnp

Solution:

6. Transistors are _______-terminal devices.

A) 2

B) 3

C) 4

D) 5

Solution:

7. How many carriers participate in the injection process of a unipolar device?

A) 1

B) 2

C) 0

D) 3

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

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 ยตA

D) 20.2 mA

Solution:

10. Calculate minority current ICO if IC = 20.002 mA and IC majority = 20 mA.

A) 2 ยตA

B) 0.002 ยตA

C) 2 nA

D) 2 pA

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

Solution:

12. In which region are both the collector-base and base-emitter junctions forward-biased?

A) Active

B) Cutoff

C) Saturation

D) All of the above

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

Solution:

14. In the active region, while the collector-base junction is ______-biased, the base-emitter is ______-biased.

A) forward, forward

B) forward, reverse

C) reverse, forward

D) reverse, reverse

Solution:

15. What is ฮฒdc equal to?

A) IB / IE

B) IC / IE

C) IC / IB

D) None of the above

Solution:

16. What are the ranges of the ac input and output resistance for a common-base configuration?

A) 10 โฆโ100 โฆ, 50 kโฆโ1 Mโฆ

B) 50 kโฆโ1 Mโฆ, 10 โฆโ100 โฆ

C) 10 โฆโ100 kโฆ, 50 โฆโ1 kโฆ

D) None of the above

Solution:

17. For what kind of amplifications can the active region of the common-emitter configuration be used?

A) Voltage

B) Current

C) Power

D) All of the above

Solution:

18. Use this table of collector characteristics to calculate ฮฒac at VCE = 15 V and IB = 30 ยตA.

A) 100

B) 106

C) 50

D) 400

Solution:

19. Calculate ฮฒdc at VCE = 15 V and IB = 30 ยตA.

A) 100

B) 116

C) 50

D) 110

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

Solution:

21. Determine the value of ฮฑ when ฮฒ = 100.

A) 1.01

B) 101

C) 0.99

D) Cannot be solved with the information provided

Solution:

22. What is the most frequently encountered transistor configuration?

A) Common-base

B) Common-collector

C) Common-emitter

D) Emitter-collector

Solution:

23. ฮฒdc for this set of collector characteristics is within _____ percent of ฮฒac.

A) 2

B) 5

C) 7

D) 10

Solution:

24. ฮฒdc = ________

A) IB / IE

B) IC / IE

C) IC / IB

D) None of the above

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

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

Solution:

27. Most specification sheets are broken down into _______.

A) maximum ratings

B) thermal characteristics

C) electrical characteristics

D) All of the above

Solution:

28. An example of a pnp silicon transistor is a 2N4123.

A) True

B) False

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

Solution:

30. Which of the following can be obtained from the last scale factor of a curve tracer?

A) hFE

B) ฮฑdc

C) ฮฑac

D) ฮฒac

Solution:

31. Calculate ฮฒac for IC = 15 mA and VCE = 5 V.

A) 200

B) 180

C) 220

D) None of the above

Solution:

32. What range of resistor values would you get when checking a transistor for forward- and reverse-biased conditions by an ohmmeter?

A) 100 โฆ to a few kโฆ, exceeding 100 kโฆ

B) Exceeding 100 kโฆ, 100 โฆ to a few kโฆ

C) Exceeding 100 kโฆ, exceeding 100 kโฆ

D) 100 โฆ to a few kโฆ, 100 โฆ to a few kโฆ

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

D) None of the above

Solution:

34. A transistor can be checked using a(n) _______.

A) curve tracer

B) digital meter

C) ohmmeter

D) Any of the above

Solution:

35. How many individual pnp silicon transistors can be housed in a 14-pin plastic dual-in-line package?

A) 4

B) 7

C) 10

D) 14

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

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

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

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

Solution:

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

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

Solution:

7. The magnitude of the base current is typically on the order of _______ as compared to _______ for the emitter.

A) ยตA, ยตA

B) ยตA, mA

C) mA, ยตA

D) mA, mA

Solution:

8. The base current is the _______ of the emitter and collector currents.

A) sum

B) difference

C) product

D) None of the above

Solution:

9. The _______ region is the region normally employed for linear (undistorted) amplifiers.

A) active

B) cutoff

C) saturation

D) All of the above

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

Solution:

11. In the saturation 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

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

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

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

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

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

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

Solution:

18. The step function (per step) of a curve tracer reveals the scale for _______.

A) collector current IC

B) VCE voltage

C) base current IB

D) All of the above

Solution:

19. The level of _____ is determined and displayed by advanced digital meters.

A) VCE

B) IB

C) IC

D) ฮฒdc

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

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

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

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

Solution:

A) gold

B) aluminum

C) nickel

D) All of the above

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

Solution:

### Complete List of Chapter Quiz in Electronic Devices and Circuit Theory

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