PinoyBIX Engineering Problem Solving and Reference

Below are the answers key for the Multiple Choice Questions (Quiz) in Communications .

1. A. amplitude

2. B. 455 kHz.

3. A. 1005

4. C. –2 V

5. A. multiplication

6. B. standard amplitude

7. A. low-pass

8. B. Voltage-Controlled Oscillator

9. D. all of the above

10. D. all of the above

11. A. θ_i > θ_c

12. C. 18.1º

TRUE/FALSE

1. B. False

2. A. True

3. A. True

4. B. False

5. A. True

6. A. True

7. A. True

8. A. True

9. B. False

10. B. False

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Voltage Regulators .

1. D. load and line regulation.

2. B. limit current through the diode.

3. A. shunt regulators

4. D. to provide current up to a maximum, but drop current to a lower value when the output becomes shorted, to prevent overheating of the device

5. B. a dc output that is the negative of the dc input voltage

6. C. 20.2 V

7. C. 1.5 A

8. D. a step-down switching regulator.

9. B. a shunt voltage regulator.

10. A. a series-pass voltage regulator.

11. C. high, high

12. D. filtering the dc pulse output.

13. A. to supply a reference voltage.

14. C. 4.05%.

15. B. 1.45 A, 10.09%

16. D. 22.5 W

17. B. 8.36 V.

18. B. decrease.

19. D. the zener would fail.

20. A. a longer

21. A. dc

22. A. Line

23. B. Load

24. C. transistor

25. C. transistor

26. B. shunt, series

27. B. low, high

28. D. 90

29. B. 3

TRUE/FALSE

1. A. True

2. B. False

3. A. True

4. B. False

5. A. True

6. B. False

7. B. False

8. A. True

9. A. True

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Oscillators .

1. B. positive feedback greater than 1.

2. D. 360°

3. B. Parallel resonant frequency is approximately 1 kHz higher than series resonant frequency.

4. A. minimum.

5. B. maximum.

6. C. fundamental

7. C. a Colpitts oscillator.

8. A. a Clapp oscillator.

9. D. a Hartley oscillator.

10. C. C₃, C₄, C5, and L₁.

11. A. 468 Hz

12. B. 6.17 kHz

13. C. 45.94 kHz

14. B. decrease.

15. D. a Hartley oscillator.

16. B. a triangle wave.

17. C. an astable multivibrator.

18. A. 131 Hz

19. B. 54.5%

20. D. Connect a diode in parallel with R₁.

21. A. a voltage-controlled oscillator.

22. A. positive

23. A. 0

24. C. greater than

25. A. Wien-bridge

26. C. 1/3.

27. D. 1/29.

28. D. band-stop

29. C. Colpitts

30. A. Hartley

TRUE/FALSE

1. B. False

2. A. True

3. A. True

4. B. False

5. A. True

6. A. True

7. A. True

8. B. False

9. A. True

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Active Filters .

1. B. –3 dB

2. A. Bessel

3. B. Butterworth

4. C. Chebyshev

5. C. –60 dB/decade.

6. D. d

7. C. c

8. B. b

9. A. a

10. C. high-pass, 2.65 kHz

11. A. 721 Hz, low-pass filter

12. A. band-pass

13. D. high-pass, 15.9 kHz

14. A. Butterworth type.

15. A. 20 dB/decade.

16. A. 20 dB/decade.

17. B. 1.23 kHz

18. B. high-pass

19. D. 80 dB/decade.

20. B. decrease.

21. A. low-pass

22. B. high-pass

23. C. band-pass

24. D. band-stop

25. A. Butterworth

26. B. Chebyshev

27. C. Bessel

28. C. A₀ = R₂ / 2 R₁

29. D. band-stop

TRUE/FALSE

1. B. False

2. A. True

3. A. True

4. A. True

5. A. True

6. B. False

7. B. False

8. A. True

9. B. False

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Special-Purpose Op-Amp Circuits .

1. C. emitter-collector

2. C. diode or BJT

3. C. both of the above

4. D. the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other

5. D. all of the above

6. A. current to the input voltage.

7. B. power to which the base must be raised to get that number.

8. C. the log region between 0 V and 0.7 V

9. B. large voltages are compressed more than small voltages.

10. A. remains constant when the load resistance changes.

11. C. proportional output voltage for a variable input current.

12. C. an instrumentation amplifier.

13. B. a constant-current source.

14. D. an isolation amplifier.

15. A. an antilog amplifier.

16. C. high, high

17. B. b

18. A. a

19. D. d

20. C. c

21. A. instrumentation

22. B. small, large

23. A. high CMRR

24. A. instrumentation

25. C. resistor.

26. B. isolation

27. D. all of the above

28. B. voltage, current

29. D. either a diode or a BJT

30. A. log

TRUE/FALSE

1. A. True

2. B. False

3. B. False

4. A. True

5. A. True

6. A. True

7. B. False

8. B. False

9. B. False

10. B. False

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Basic Op-Amp Circuits .

1. B. 12 V.

2. D. hysteresis.

3. A. two trigger levels.

4. C. zener

5. B. select the highest value input.

6. D. the rate of change of the input voltage.

7. D. 26 Vp-p

8. C. +Vsat

9. D. –Vsat

10. C. +Vsat

11. B. –0.5 V

12. A. 1.05 V

13. D. +1.41 V

14. C. –2.47 V

15. B. a differentiator.

16. C. an integrator.

17. B. a triangle wave.

18. C. 1.52 mV/µs

19. A. pulse waveform.

20. B. a comparator with hysteresis.

21. C. uses a capacitor in its feedback circuit.

22. D. comparator

23. B. thermostat.

24. C. Schmitt trigger.

25. B. zener diodes

26. C. both of the above

27. A. integrator

28. B. Differentiation

29. A. averaging

30. B. nonzero-level detector

TRUE/FALSE

1. A. True

2. B. False

3. A. True

4. B. False

5. A. True

6. A. True

7. A. True

8. A. True

9. B. False

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in The Operational Amplifier .

1. C. a voltage-follower.

2. B. a non-inverting amplifier.

3. A. an inverting amplifier.

4. B. –1.2 V

5. D. 21.

6. B. 5 V

7. C. 50 kΩ.

8. D. 12 kΩ, 120 kΩ

9. D. –50 mV

10. A. 1.36 V/µs

11. D. to set input impedance and voltage gain.

12. B. for input offset voltage compensation.

13. A. for bias current compensation.

14. B. increase, decrease

15. D. none of these.

16. D. 100,000

17. C. 20 dB.

18. D. 15.4 Hz

19. D. all of the above

20. B. 103.5 dB

21. B. 72 dB.

22. B. –26.7

23. B. 11

24. D. 1.

25. C. 112.4 kHz

26. B. 155 kHz

27. A. 10.4 kHz

28. B. 1.5 MHz

29. C. 83.3 kHz

30. B. increases, decreases

31. A. high, low, high, wide

32. C. temperature

33. C. slew rate

34. A. non-inverting

35. B. inverting

36. C. voltage-follower

37. D. 200,000

38. B. A_cl

39. C. –270

TRUE/FALSE

1. B. False

2. A. True

3. B. False

4. A. True

5. A. True

6. A. True

7. A. True

8. B. False

9. B. False

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Thyristors .

1. E. e

2. B. b

3. C. c

4. D. d

5. A. a

6. B. a UJT.

7. C. an SCR

8. A. varying, width

9. B. a UJT.

10. C. a triac.

11. B. an ac motor control

12. D. this is normal; nothing is wrong.

13. B. an SCS

14. C. 4

15. A. gate.

16. A. SCR

17. B. diac

18. A. triac

19. C. SCR.

20. B. PUT

21. A. SCS

22. B. PUT

TRUE/FALSE

1. A. True

2. B. False

3. A. True

4. A. True

5. B. False

6. A. True

7. B. False

8. B. False

9. B. False

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in Amplifier Frequency Response.

1. D. all of the above

2. C. normalized

3. A. frequency response of each stage depending on the relationships of the critical frequencies.

4. B. 10% and 90% response.

5. C. the highest frequency

6. D. 5.4 V p-p

7. B. 107.3 dB.

8. C. 23.1 kHz

9. A. 133 Hz

10. C. 603 Hz

11. B. low-frequency response.

12. B. low-frequency response.

13. A. high-frequency response.

14. B. decrease.

15. C. 0.671 V p-p

16. B. 3.42 V p-p.

17. C. 16.97 mV

18. B. maintain the input voltage constant.

19. B. –20 dB

20. D. 6 dB

21. D. reducing the amplifier's gain and introducing phase shift as the signal frequency increases.

22. D. all of the above

23. A. 0

24. B. 6, increase

25. A. 3, decrease

26. A. 20

27. B. decade.

28. B. octave.

29. D. 90

30. B. step-response

TRUE/FALSE

1. B. False

2. A. True

3. B. False

4. A. True

5. A. True

6. A. True

7. A. True

8. B. False

9. A. True

10. A. True

Complete List of Chapter MCQs in Floyd's Electronic Devices

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Below are the answers key for the Multiple Choice Questions (Quiz) in FET Amplifiers and Switching Circuits .

1. B. common-collector

2. C. common-emitter

3. C. common-base

4. A. keep the source effectively at ac ground.

5. C. common-source

6. A. R_G || R_IN(gate).

7. C. 5 mA.

8. D. 9 V

9. B. 1.2 kΩ

10. D. 8.8.

11. A. 176 mV p-p

12. A. undistorted.

13. C. 10.8 V

14. D. –6 V

15. C. 2.8 V p-p

16. A. 100 MΩ.

17. C. remain the same.

18. B. decrease.

19. D. distort.

20. C. remain the same.

21. C. remain the same.

22. C. 1 common-gate and 1 common-source amplifier.

23. D. 100%.

24. A. high.

25. A. 0

26. C. 1 / gm

27. C. D-MOSFET

28. C. gm

29. C. MOSFETs

30. A. the output transistors are operated as switches.

31. B. of their threshold characteristic (V_GS(th)).

32. B. V_GS(th)

33. D. all of the above

34. C. n-channel and p-channel E-MOSFETs in series.

35. D. all of the above

TRUE/FALSE

1. A. True

2. B. False

3. B. False

4. A. True

5. B. False

6. A. True

7. A. True

8. B. False

9. A. True

10. A. True

11. A. True

12. A. True

13. B. False

14. B. False

15. B. False

Complete List of Chapter MCQs in Floyd's Electronic Devices

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1. between the ohmic area and the constant current area
2. pinch-off voltage
3. cutoff voltage
4. forward transconductance
5. the gate-source junction being reverse-biased
6. either a depletion or an enhancement MOSFET
7. MOSFET
8. 3 V
9. d
10. a
11. c
12. b
13. 6 V
14. 6.8 V
15. –9 V
16. 2 mA
17. 3.92 mA
18. 6 V
19. 8 V
20. 0 mA
21. –6 V
22. 2 V
23. reverse
24. ohmic, constant-current, breakdown
25. any of the above
26. D-MOSFET
27. true
28. I_DSS
29. 0
30. all of the above
31. V_GS

Complete List of Chapter MCQs in Floyd's Electronic Devices

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1. because the collector terminal is the critical terminal for heat dissipation
2. with no signal input
3. slightly less than 180° of the input cycle
4. thermal runaway
5. class C
6. class B
7. 750
8. class C
9. 4.4 mA
10. 5.4 V
11. class A
12. class AB
13. 0.7 V, 15 V, 0 V
14. about 78%
15. 10.7 V
16. 9.3 V
17. C₃ is open
18. BE₁ is open
19. R₁ is open
20. V_CC is 0 V
21. a sine wave.
22. 10
23. B
24. AB
25. 79
26. AB
27. C
28. all of the above
29. both of the above
30. B

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. effectively shorts
2. to maximize amplifier gain
3. to reduce the effects of r'_e
4. common-collector amplifier
5. emitter
6. the difference of the two input voltages
7. two inputs and two outputs
8. 3.125 Ω
9. 3.7 V
10. 6 mA
11. 5 V
12. 50 kΩ
13. 3.77 kΩ
14. 5
15. 416 Ω
16. 378 Ω
17. 600
18. 12 mV
19. an open C₂.
20. an open base-emitter of Q₁
21. a low voltage gain and a high input impedance
22. common-emitter
23. r_e′
24. high, high, high, low
25. replace coupling and bypass capacitors with opens
26. decreases
27. high, high, low
28. multiplication, increased
29. sum of dB voltage gains
30. h_re / h_oe
31. less input voltage is needed to turn it on.

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. collector-feedback bias
2. both positive and negative supply voltages
3. all of the above
4. all of the above
5. only if the base current is much larger than the current through R₂ (the lower bias resistor).
6. V_C = 8.75 V
7. halfway between cutoff and saturation.
8. 50 µA
9. 5 mA
10. 100
11. 5 mA
12. 2.5 V
13. 1.5 kΩ
14. 320 µA
15. R_E is open
16. no problems.
17. a short from collector to emitter
18. the base-emitter junction is open
19. voltage-divider bias
20. zero, I_(sat)
21. saturation, cutoff
22. voltage-divider
23. β_DCR_E
24. voltage-divider bias
25. base bias
26. emitter bias
27. collector-feedback bias
28. nonconducting
29. saturated
30. cutoff

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. all of the above
2. h_fe
3. saturation and cutoff
4. 0.7 V
5. varies with temperature and I_C.
6. bipolar junction transistor
7. 3.75 mA
8. 90
9. negative, positive
10. 7.5 V
11. 4.375 V
12. 0.7 V
13. 9.9 V
14. –9.2 V
15. 2.085 mA
16. 10.425 A
17. 13.21 V
18. 7.92 mA
19. 92 kΩ
20. cutoff
21. operating in saturation.
22. emitter, collector, base
23. npn and pnp
24. I_E = I_B + I_C
25. either β_DC or h_FE, but not α_DC
26. either β_DC / (β_DC + 1) or α_DC, but not β_DC
27. 0.7 < V_CE < V_CE(max)
28. both I_C and ºC
29. all of the above
30. all of the above
31. nA

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. electroluminescence.
2. reverse-breakdown region.
3. hot carrier diodes.
4. coherent and monochromatic light.
5. 8.325 V.
6. 161 mA.
7. remain the same, decrease
8. increase.
9. increase.
10. decrease.
11. e
12. b
13. d
14. c
15. a
16. the diode is open.
17. in very fast-switching circuits.
18. in circuits requiring negative resistance.
19. a varactor.
20. zener
21. avalanche
22. varactor
23. reverse, maximize
24. gallium.
25. current regulator
26. Schottky
27. Schottky
28. step-recovery
29. LED
30. to eliminate harmonic distortion

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. 60 Hz
2. 100 Hz
3. reducing the peak output voltage by 0.7 V.
4. line regulation
5. load regulation
6. peak inverse voltage
7. the filter capacitor is shorted.
8. an open transformer secondary.
9. b
10. c
11. d
12. a full-wave rectifier (no filter) with an open diode.
13. c
14. b
15. d
16. a
17. c
18. a
19. forward-biased.
20. equal to
21. forward, 180º
22. twice
23. 2Vp_(out) + 0.7 V
24. increasing, increasing
25. clipper or limiter
26. clamper
27. 50 V
28. 3

Complete List of Chapter Quiz in Floyd's Electronic Devices

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1. All of the above
2. 2n² where n is the number of the shell.
3. has pentavalent impurity atoms added.
4. positive supply
5. anode
6. the value of dc voltages for the device to operate properly.
7. that impurities are added to decrease the resistance of the material.
8. 0.7 V.
9. a germanium diode.
10. cathode, anode
11. current.
12. 2.3 V, 1.6 V
13. reverse leakage current.
14. a pn junction.
15. is subjected to a large reverse voltage.
16. is relatively constant.
17. A material with few free electrons.
18. decreases.
19. the diode is internally shorted.
20. 4
21. 8
22. recombination
23. pentavalent
24. all of the above
25. forward-biased.
26. increased, increases
27. decreases
28. open, short
29. open

Complete List of Chapter Quiz in Floyd's Electronic Devices

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