Multiple Choice Questions Topic Outline
- MCQs in Transistor Construction
- MCQs in Transistor Operation
- MCQs in Common-Base Configuration
- MCQs in Transistor Amplifying Action
- MCQs in Common-Emitter Configuration
- MCQs in Common-Collector Configuration
- MCQs in Limits of Operation
- MCQs in Transistor Specification Sheet
- MCQs in Transistor Testing
- MCQs in Transistor Casing and Terminal Identification
Begin and Good luck!
1. In what decade was the first transistor created?
- A) 1930s
- B) 1940s
- C) 1950s
- D) 1960s
2. How many layers of material does a transistor have?
- A) 1
- B) 2
- C) 3
- D) 4
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
4. Which of the following is (are) the terminal(s) of a transistor?
- A) Emitter
- B) Base
- C) Collector
- D) All of the above
5. List the types of bipolar junction transistors.
- A) ppn, npn
- B) pnp, npn
- C) npp, ppn
- D) nnp, pnp
6. Transistors are _____-terminal devices.
- A) 2
- B) 3
- C) 4
- D) 5
7. How many carriers participate in the injection process of a unipolar device?
- A) 1
- B) 2
- C) 0
- D) 3
8. Which component of the collector current IC is called the leakage current?
- A) Majority
- B) Independent
- C) Minority
- D) None of the above
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
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
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
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
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
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
15. What is βdc equal to?
- A) IB / IE
- B) IC / IE
- C) IC / IB
- D) None of the above
16. What are the ranges of the ac input and output resistance for a common-base configuration?
- A) 10 Ω–100 Ω, 50 k Ω–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
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
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
19. Calculate βdc at VCE = 15 V and IB = 30 µA.
- A) 100
- B) 116
- C) 50
- D) 110
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
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
22. What is the most frequently encountered transistor configuration?
- A) Common-base
- B) Common-collector
- C) Common-emitter
- D) Emitter-collector
23. βdc for this set of collector characteristics is within _____ percent of βac.
- A) 2
- B) 5
- C) 7
- D) 10
24. βdc = ________
- A) IB / IE
- B) IC / IE
- C) IC / IB
- D) None of the above
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
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
27. Most specification sheets are broken down into _____.
- A) maximum ratings
- B) thermal characteristics
- C) electrical characteristics
- D) All of the above
28. An example of a pnp silicon transistor is a 2N4123.
- A) True
- B) False
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
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
31. Calculate βac for IC = 15 mA and VCE = 5 V.
- A) 200
- B) 180
- C) 220
- D) None of the above
32. What range of resistor values would you get when checking a transistor for forward- and 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
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
- C) Bad ohmmeter
- D) None of the above
34. A transistor can be checked using a(n) _____.
- A) curve tracer
- B) digital meter
- C) ohmmeter
- D) Any of the above
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
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
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
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
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
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
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
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
8. The base current is the _____ of the emitter and collector currents.
- A) sum
- B) difference
- C) product
- D) None of the above
9. The _____ region is the region normally employed for linear (undistorted) amplifiers.
- A) active
- B) cutoff
- C) saturation
- D) All of the above
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
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
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
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
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
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
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
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
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
19. The level of _____ is determined and displayed by advanced digital meters.
- A) VCE
- B) IB
- C) IC
- D) βdc
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
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
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
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
24. The leads of a transistor are typically made of _____.
- A) gold
- B) aluminum
- C) nickel
- D) All of the above
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
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