PinoyBIX Engineering Problem Solving and Reference

Below are the answers key for the Textbook Assignment: Chapter 1, "Circuit Measurement" from the Module 3 — Introduction to Circuit Protection, Control, and Measurement in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. D. To determine the reason a circuit is not functioning properly

2. B. To monitor circuit operation

3. A. They can be used on more than one device

7. D. Permanent-magnet moving-coil

8. D. The interaction of magnetic fields

9. C. They make electrical connections to the meter movement

12. C. A rectifier

13. B. Smoothing the oscillations of the pointer

14. C. Incorporate an airtight chamber containing a van

15. B. Average

16. C. Effective

17. D. Electrodynamic

18. B. Current

19. C. Voltage

20. A. In series with the load

21. A. It acts as a resistances in series and lowers the circuit current

22. C. By ensuring that the meter resistance is low compared to circuit resistance

23. A. The lowest amount of current for fullscale deflection indication

24. B. The highest amount of current for fullscale deflection indication

25. B. The highest range

26. C. The mid-scale portion

27. D. Never

28. D. All of the above

29. C. Voltage

30. B. In parallel with the load

31. A. Loading

32. C. Higher than

33. D. Each of the above

34. D. High ratio of internal resistance to full-scale deflection indication

35. A. A resistor in series with the meter movement

36. B. The highest

37. C. Voltage

38. C. High voltage

39. A. Deenergize the circuit before connecting the meter

40. D. Resistance

41. A. Continuity

42. A. In series with the load

43. B. Range resistors

44. C. Mid-scale portion

45. A. Series and shunt

46. B. The scales of the meters

47. B. Deenergize the circuit before connecting the meter

48. D. High resistance

49. A. ∞

50. C. Do not touch the meter leads when a measurement is being taken

51. D. Each of the above

52. D. Changing of the multimeter from an ammeter to a voltmeter

53. C. Separate scales for ac and dc

54. B. To aid in reducing parallax error

55. A. Hidden behind the pointer

56. D. Never apply power to the circuit when measuring voltage with the meter

57. C. Ac; highest voltage range

58. B. Hook-on voltameter

59. A. Power

60. B. Energy

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Below are the answers key for the Textbook Assignment: Chapter 3, "Capacitance" from the Module 2 — Introduction to Alternating Current and Transformers in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. C. Both cause the storage of energy

2. A. opposes a change in voltage

3. A. electrostatic field

4. D. (a) Attracts them to the positive charges (b) Distorts their orbits

5. D.

6. A. Straight lines

9. C. Two iron plates separated by an air gap

10. C. 3 farads

15. D. Both B and C above, individually, are correct

16. D. Thickness of the plates

17. A. The plates are moved closer together

18. B. (a) Glycerine (b) Pure water

19. C. Vacuum, air

20. B. 2.76 pF

21. D. working voltage

22. A. 200 volts

23. A. 550 volts

24. A. Dielectric hysteresis

25. B. Dielectric-hysteresis

26. C. Vacuum

27. B. Dielectric-leakage

49. D. 132.0 μF

50. C. 0.0015 μF

51. A. 0.2 sec

52. B. By their dielectric materials

53. C. Oil

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Below are the answers key for the Textbook Assignment: Chapter 2, "Inductance" from the Module 2 — Introduction to Alternating Current and Transformers in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. C. Changes in current

2. B. H

3. D. Henry

4. B. 2.0 henries

5. D. Inertia

6. D. Electromotive

7. A. They are dislodged from orbit

8. D. All of these

9. D. Counter electromotive force

10. C. It opposes either a rise or a fall in current

11. B. The left-hand rule for generators

12. A. conductor

13. B. The collapsing magnetic field

14. A. An ac circuit

15. A. By core type

16. C. soft iron

17. B. To support the windings

18. C. Conductor tensility

19. D. four

20. A. Large diameter coils have more wire and thus more flux

21. D. Four

22. B. (a) Decrease, (b) by 1/2

23. D. High permeability and low reluctance

24. A. Magnetic flux

25. B. flux linkage

26. C. Flux linkage

27. A. L

28. C. The values are changing

29. C. 3.3 henries

30. D. 15.0 volts

31. A. (a) 10,000 mH, (b) 10,000,000 μH

41. A. 63.2%

42. B. Five

43. B. 17.3 amperes

44. D. 4.7 amperes

45. B. 19 mA

46. D. 0.0133 seconds

47. B. 12 ohms

48. B. 0.05 second

49. C. Because all inductors have resistance which dissipates power

50. C. P = E/R²

51. C. Hysteresis loss

52. C. Hysteresis loss

53. B. Whenever the flux of one inductor causes an emf to be induced in another inductor

54. B. Physical dimensions of the coils

55. D. The magnetic flux ratio linking the coils

56. A. 4.2 μH

57. C. 12.5 μH

58. B. 18.1 μH

59. C. 0.98 μH

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Below are the answers key for the Textbook Assignment: Chapter 1, "Concepts of Alternating Current" from the Module 2 — Introduction to Alternating Current and Transformers in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. A. amplitude and direction

2. B. A resistor placed in series with the load

3. D. Ac can be readily stepped up or down

4. B. Amplitude versus time

5. A. A magnetic field

9. C. It is perpendicular to and equal along all parts of the conductor

10. D. All of these

11. B. magnetic field

12. A. Hysteresis loss

13. D. (a) Concentric circles (b) Perpendicular

14. A. Because separate lines of magnetic force link and combine their effects

15. B. (a) Minimum, (b) minimum

16. B. A sine curve

17. C. 180º

18. D. (a) 90º , (b) 270º

19. D. (a) 4, (b) 2

20. D. (a) Magnetic flux, north to south, (b) Current

21. A. (a) Ac, (b) sine wave

22. C. Frequency

23. B. Hertz

24. A. 1 Hz

25. A. 0.004 second

26. D. 1667 Hz

37. C. 1400 times

38. C. Instantaneous value

39. D. Effective value

40. B. The average value

41. C. E_avg = 0.636 x E_max

42. B. 38 volts

43. B. 140 volts

44. D. 9 volts

45. A. 2.9 amperes

46. D. 1.9 amperes

47. B. I_eff

48. C. E_eff

49. C. E_eff

50. A. 170 volts

51. B. Effective

52. C. E_eff = E_max x 0.707

53. A. 4.6 amperes

54. B. 11 volts

61. C. Never mix

62. B. 14.6 amperes

63. C. 20.01 amperes

64. D. 47.1

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Below are the answers key for the Textbook Assignment: Chapter 3, "Direct Current" from the Module 1 — Introduction to Matter, Energy, and Direct Current in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. B. (a) Es (b) R1

2. D. Open

3. D. Schematic diagram

4. D. (a) Decrease (b) increase

5. A. (a) Increase (b) decrease

6. C. (E = IR)

7. B. 75 V

8. D. 40 A

9. A. Power

10. B. Current

11. D. Each of the above

12. C. 3 A

13. B. 240 W

14. B. Wirewound

15. A. 7.46 kWh

16. D. 0.785

17. C. 180 Ω

18. C. 540 V

19. C. 180 V

20. A. 120 V

21. B. The source voltage would have to be decreased

22. A. 240 W

23. A. 720 W

24. C. Negative

25. B. 25 V

26. C. 0.33 A from Y to X

27. A. Open

28. B. Short

29. A. R₁ will be destroyed

30. A. 2.5 V

31. D. (a) 97.5 V (b) 97.5 V

32. A. Ri = RL

33. A. Equal

34. C. 50%

35. B. 60 V

36. D. (a) Equals (b) divides

37. D. It is leaving a junction

38. A. 100 Ω

39. B. 20 Ω

40. C. 30 Ω

41. D. Equivalent resistor

42. D. 120 V

43. B. 2 A

44. A. 8 Ω

45. C. 1.8 kW

46. D. 1200 W

47. B. 15 Ω

48. C. 60.0 W

49. B. 12 V

50. D. 15 Ω

51. C. 52 V

52. D. (a) Becomes infinite (b) Decreases to zero

53. A. (a) Increases (b) decreases

54. D. (a) Decreases (b) increases

55. D. (a) Decreases (b) increases

56. D. None

57. A. The current of the source

58. C. 30 mA

59. C. 5 k

60. B. 330 mA

61. C. The voltage drop across R₁ depends on the value of load 1

62. A. By adding IR₁and the current requirement of load 1

63. C. By subtracting the voltage requirement of load 1 from the voltage requirement of load 2

64.

65.

66. A. It provides the desired resistance with resistor values that are easily obtainable

67. A. ground between two of the dividing resistors

68. D. All voltages

69. B. Report the malfunction to a qualified technician

70. B. The first person on the scene

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Below are the answers key for the Textbook Assignment: Chapter 2, "Batteries " from the Module 1 — Introduction to Matter, Energy, and Direct Current in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. B. To change chemical energy to electrical energy

2. A. Electrodes, electrolyte, container

3. C. solution acting upon the electrode

4. D. mounting for the electrode

5. A. negative electrode

6. B. positive electrode

7. D. Electrochemical action

8. A. The secondary cell can be recharged by passing current through it in the proper direction

9. C. The circuit resistance and the internal resistance of the cell

10. B. Increasing the size of the electrodes

11. C. A positive charge caused by a loss of electrons

12. B. A negative charge caused by an excess of electrons

13. A. The material of the cathode combines with the negative ions to form a new substance.

14. D. Each of the above

15. B. To supply a return path for current

16. D. The secondary cell

17. C. Lead peroxide, sponge lead, sulfuric acid, and water

18. C. Connecting the negative terminal of a voltage source to the cathode of the cell and the positive terminal of the voltage source to the anode of the cell

19. A. A, C, E, H

20. D. B, D, F, G

21. A. Fully charged

22. D. Increases internal resistance, thereby decreasing the output voltage

23. A. Venting the cell

24. A. Shelf life is reduced

25. C. Paste

26. B. Zinc container

27. D. In a refrigerated space

28. C. Both A and B above

29. B. It has a very stable output voltage

30. B. Connecting the anode and cathode together without a load

31. D. All the above

32. A. Alkaline cell

33. A. Power requirement

34. C. Lithium organic

35. D. All of the above

36. D. Emergency equipment batteries

37. B. Silver-cadmium

38. A. One

39. B. Parallel

40. B. (a) 1.5 volts (b) 5/8 ampere

41. A. Series

42. C. (a) 7.5 volts (b) 1/8 ampere

43. D

44. C. Series-parallel

45. C. (a) 9 volts (b) 1/4 ampere

46. B. Check the technical manual for information on the specific type of battery

47. B. Enough so the float will rise without entering the suction bulb

48. C. Fresh water

49. D. Distilled water

50. A. Terminals should be electrically connected together before transporting a battery

51. D. Flush with fresh water

52. B. 200 hr

53. A. 15 amperes

54. C. Normal

55. D. Used after electrolyte is added to a dry-shipped battery

56. B. Used periodically as part of a maintenance routine

57. C. Used to keep a battery at full charge while the battery is idle

58. A. Used in emergency only

59. D. Decrease the charging rate

60. A. Steady gassing

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Below are the answers key for the Textbook Assignment: Chapter 1, "Turning to Electricity" from the Module 1 — Introduction to Matter, Energy, and Direct Current in Navy Electricity and Electronics Training Series (NEETS) . Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

1. D.  Each of the above

2. A.  element

3. C.  A compound

4. A.  An element

5. B.  Electron

6. A.  Proton

7. D.  Neutron

8. B.  Photons

9. B.  The electron will jump to an orbit further from the nucleus

10. C.  Light energy is emitted

11. A.  Valence

12. D.  Ionized

13. C.  The number of free electrons

14. C.  Negative

15. B.  Friction between two insulators

16. A. Positive

17. D. Unlike charges attract each other, like charges repel each other

18. A. Electric field of force

19. B. Entering negative charge, leaving positive charge

20. C. High-fidelity speakers

21. C. Both A and B above

22. D. They are relatively easy to magnetize

23. A. Temporary

24. B. retentivity

25. D. Like poles repel, unlike poles attract

26. A. The geographic north pole

27. A. tiny molecular magnets

28. D. magnetized

29. A. The magnetic field

30. C. magnetic line of force

31. C. They cross each other at right angles

32. C. Soft iron

33. D. In pairs with a north pole and a south pole together

34. B. Energy

35. A. Kinetic

36. B. Potential

37. C. Both A and B above

38. B. 2100 V

39. D. All of the above

40. A. A voltage source

41. D. Each of the above

42. B. Pressure

43. A. Heat

44. D. Chemical action

45. C. Magnetism

46. D. Chemical action

47. A. Electrons moving from negative to positive

48. B. 186,000 miles per second

49. A. Current increases

50. C. 0.10 ampere

51. D. Ω

52. A. Aluminum

53. B. Copper

54. C. Cross-sectional area is decreased, length is increased

55. B. Negative

56. C. Zero

57. D. Ohm

58. B. A reciprocal relationship

59. D

60. A. By the wattage rating

61. C. The resistance value changes with age

62. D. Wirewound resistor

63. B. (a) Two (b) three

64. A. Rheostat

65. C. 33.0 kΩ

66. A. 682.5 kΩ to 617.5 kΩ

67. C. Yellow

68. C. 790 Ω

69. B. 5%

70. C. 0.01%

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