This is the Self-test in Chapter 4: Bipolar Junction Transistors from the book Electronic Devices Conventional Current Version, 9th edition by Thomas L. Floyd. If you are looking for a reviewer in Electronics Engineering this will definitely help you before taking the Board Exam.
Floyd Self-test Chapter 4 Topic Outline
- Floyd Self-test in Bipolar Junction Transistor (BJT) Structure
- Floyd Self-test in Basic BJT Operation
- Floyd Self-test in BJT Characteristics and Parameters
- Floyd Self-test in The BJT as an Amplifier
- Floyd Self-test in The Phototransistor
- Floyd Self-test in The BJT as a Switch
- Floyd Self-test in Transistor Categories and Packaging
If you are looking for the Multiple Choice Questions in Floyd’s Electronic Devices proceed to
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. The three terminals of a bipolar junction transistor are called
(a) p, n, p
(b) n, p, n
(c) input, output, ground
(d) base, emitter, collector
Answer: Option D
Solution:
2. In a pnp transistor, the p region are
(a) base and emitter
(b) base and collector
(c) emitter and collector
Answer: Option C
Solution:
3. For operation as an amplifier, the base of an npn transistor must be
(a) positive with respect to the emitter
(b) positive with respect to the collector
(c) negative with respect to the emitter
(d) 0V
Answer: Option A
Solution:
4. The emitter current is always
(a) greater than the base current
(b) less than the collector current
(c) greater than the collector current
(d) answers (a) and (c)
Answer: Option D
Solution:
5. The βdc of a transistor is its
(a) current gain
(b) voltage gain
(c) power gain
(d) internal resistance
Answer: Option A
Solution:
6. If Ic is 50 times larger than Ib, then βdc is
(a) 0.02
(b) 100
(c) 50
(d) 500
Answer: Option C
Solution:
7. The approximate voltage across the forward-biased base-emitter junction of silicon BJT is
(a) 0V
(b) 0.7
(c) 0.3
(d) VBB
Answer: Option B
Solution:
8. The bias condition for a transistor to be used as a linear amplifier is called
(a) forward-reverse
(b) forward-forward
(c) reverse-reverse
(d) collector bias
Answer: Option A
Solution:
9. If the output of a transistor amplifier is 5V rms and the input is 100mV rms, the voltage gain is
(a) 5
(b) 500
(c) 50
(d) 100
Answer: Option C
Solution:
10. When a lowercase r’ is used in relation to a transistor, it refers to
(a) a low resistance
(b) a wire resistance
(c) an internal ac resistance
(d) a source resistance
Answer: Option C
Solution:
11. In a given transistor amplifier, Rc= 2.2 kΩ and r’e =20Ω, the voltage gain is
(a) 2.2
(b) 110
(c) 20
(d) 44
Answer: Option B
Solution:
12. When operated in cutoff and saturation, the transistor acts like a
(a) linear amplifier
(b) switch
(c) variable capacitor
(d) variable resistor
Answer: Option B
Solution:
13. In cutoff, Vce is
(a) 0V
(b) minimum
(c) maximum
(d) equal to Vcc
(e) answers (a) and (b)
(f) answers (c) and (d)
Answer: Option F
Solution:
14. In saturation, Vce is
(a) 0.7V
(b) equal to Vcc
(c) minimum
(d) maximum
Answer: Option C
Solution:
15. To saturate a BJT,
(a) Ib= Ic(sat)
(b) Ib>Ic(sat)/βdc
(c) Vcc must be at least 10V
(d) the emitter must be grounded
Answer: Option B
Solution:
16. Once in saturation, a further increase in base current will
(a) cause the collector current to increase
(b) not affect the collector current
(c) cause the collector current to decrease
(d) turn the transistor off
Answer: Option B
Solution:
17. In a phototransistor, base current is
(a) set by a bias voltage
(b) directly proportional to light intensity
(c) inversely proportional to light intensity
(d) not a factor
Answer: Option B
Solution:
18. The relationship between the collector current and a light-generated base current is
(a) Ic= βdcIλ
(b) Ic= αdcIλ
(c) Ic= λλ
(d) Ic= β2dcIλ
Answer: Option A
Solution:
19. An optocoupler usually consists of
(a) two LEDs
(b) an LED and a photodiode
(c) an LED and a phototransistor
(d) both (b) and (c)
Answer: Option D
Solution:
20. In a transistor amplifier, if the base-emitter junction is open, the collector voltage is
(a) Vcc
(b) 0V
(c) floating
(d) 0.2V
Answer: Option A
Solution:
21. A DMM measuring on open transistor junction shows
(a) 0V
(b) 0.7V
(c) OL
(d) Vcc
Answer: Option C
Solution:
Complete List of Floyd Self-test in Electronic Devices
Check your work.
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