Electronics Engineering Coaching Materials: Section 4 Module 1

This is the Section 4 Module 1 of the compiled Electronics Coaching Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet.

This is the Section 4 Module 1 of the compiled Electronics Coaching Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and other Electronics References. This particular Notes in Electronics Engineering has random Questions and Answers in random topics. Make sure to familiarize each questions to increase the chance of passing the ECE Board Exam.

Electronics Engineering Coaching: Section 4 Module 1

ELECTRICITY / MAGNETISM / SEMICONDUCTOR FUNDAMENTALS

1. Current is directly proportional to voltage and inversely proportional to resistance.

OHM’s LAW

2. A law that states that the algebraic sum of the current entering and leaving the node or junction is equal to zero.

KIRCHOFF’S CURRENT LAW

3. One coulomb is how many electrons?

6.25 X 1018

4. One coulomb is equivalent to _____ electrons.

6.25 X 1018

5. Energy gap of semiconductor

1eV

6. Permeability of a material when its has a relative permeability of 10-6

4Ï€ x 10-1 H/m

7. Electrostatic charges can develop up to

35 000 VOLTS

8. Electron is pack in a given volume

ELECTRON DENSITY

9. What definition best describes an insulator?

A MATERIAL THAT HAS HIGH RESISTANCE

10. Which of the following is not a purpose of resistor?

Current limiting

Biasing

Voltage dividing

NONE OF THESE

11. If you are preparing to single lace conductors, what total length must the lacing be in relationship to the longest conductor?

TWO AND ONEHALF OF THE LENGTH

12. A material which allows the lowest forward voltage drop for a diode

GERMANIUM

13. Resistance in a semiconductor is known as___________.

BULK RESISTANCE

14. Typical range of resistivity of semiconductor

10 x 104

15. In resistor, 4K7 has what value

4.7 kâ„¦

16. Resistor value: red, red, red, gold

2.2 kâ„¦  ± 5%

17. Strain gauge resistance

200

18. In resistor circuit, a connection with greater power dissipation per resistor

BOTH PARALLEL AND SERIES

19. Carbon composition resistor

ESSENTIALLY HAS NO INDUCTANCE AND CAPACITANCE

20. An insulator is best described as

A MATERIAL THAT HAS A VERY HIGH RESISTANCE

21. A logical place for a wirewound resistor is in ____.

A HIGH-POWER DC CIRCUIT

22. A network of resistors, diodes and capacitors that shifts the DC voltage level without changing its waveform.

CLAMPER

23. Two conductors with insulator in between

CONDENSER (OLD NAME); CAPACITOR (NEW NAME)

24. Capacitor stores energy in

ELECTRIC FIELD

25. When a capacitor is connected to an AC source, the current ___ the voltage by 90 degrees

26. Energy stored in an electrostatic or magnetic field

POTENTIAL

27. A ferromagnetic core placed in an inductor to _____

INCREASE INDUCTANCE

28. The advantage of toroid core over solenoid core is it

CONCENTRATES MAGNETIC FLUX

29. An advantage of toroid core over a solenoid core is the fact that ______

THE TOROID CONFINES THE MAGNETIC FLUX

30. The unit for overall magnetic field quantity

MAXWELL

31. Another name for dielectric constant

RELATIVE PERMITTIVITY

32. The geomagnetic line of flux are

HORIZONTAL AT THE GEOMAGNETIC EQUATOR

33. Attractive forces exist when two parallel conductors have currents that are

OPPOSITE IN DIRECTION

34. When inductance is small,

ENERGY IS STORED AND RELEASED QUICKLY

35. A good form of inductor at FM

AIR CORE

36. Ferromagnetic coils are not used in RF because air core is ____

A BETTER INDUCTOR AT FM

37. Paper capacitor has less service life than other capacitor. This is a _____ statement.

FALSE

38. A paper capacitor is generally has shorter life compared to other type of capacitor

FALSE

39. Typical value of paper capacitor

0.01 pF

40. In a Variable air type capacitor, capacitance is maximum when ______

MOVABLE PLATES ARE CLOSE

41. The SI unit for exposure in x-ray, gamma, and in air.

COULOMB PER KILOGRAM ( C/KG )

42. The unit of a current.

AMPERE

43. When a charge of one Coulomb passes at one point in one second, the electrical charge is ___

1 AMP

44. Voltage drop is____

DIFFERENCE IN POTENTIAL BETWEEN TWO POINTS

45. Examples of trivalent impurities

BORON, GALLIUM, INDIUM

46. Acceptor impurities

TRIVALENT IMPURITIES

47. Energy gap of a semiconductor

1eV

48. Pure silicon

ELECTRON AND PROTON ARE EQUAL IN NUMBERS

49. The mostly used semiconductor material in manufacturing electronic devices

GE, SI AND GAAS

50. The most extensibly use semiconductor

SILICON

51. An intrinsic semiconductor has ___ bond that forms … tetra???

COVALENT

52. PN junctions are protected from contamination during the fabrication process by which materials?

OXIDE

53. Advantage of GaAs to Ge and Si.

FASTER

54. Of the following tests, which is the most valid for checking a diode

DYNAMIC ELECTRIC CHECK WITH DIODE TEST SET

55. What current flow in a semiconductor is due to the applied electric field?

Drift Current

56. A semiconductor equivalent to two diode in series with reversed polarity

THYRECTOR

57. Intrinsic semiconductors (or impurities?) have

COVALENT BOND FORMING TETRAHEDRAL STRUCTURE

58. A compound of the elements gallium and arsenic used in the manufacture of devices such as microwave frequency integrated circuits, monolithic microwave integrated circuits, infrared LED, laser diode, solar cells and optical window.

GALLIUM ARSENIDE (GaAs)

59. A solid form in which atoms, ion, and molecules are ordered in well arrangement

CRYSTALLINE

60. A structure of solid in which the position of atoms are predetermined

CRYSTALLINE

61. A liquid crystal that is least ordered and more liquid-like

NEMATIC

62. An ac electromagnet _______

ATTRACTS PURE, UNMAGNETIZED IRON

63. The force between a permanent magnet and a ferromagnetic material that is not yet magnetized is

NEVER REPULSIVE

64. Increase in space in electromagnetic circuit …

INCREASE RELUCTANCE

65. Advantage of electromagnet over permanent magnet

ELECTROMAGNET CAN BE SWITCHED ON AND OFF

66. When an ion …… on ground state…

IONIZATION ENERGY

67. …… expand the surface area….

SURFACE TENSION

68. Describes the color of radiation emitted by a blackbody at a given temperature.

WIEN’S LAW

69. Nonmetallic protection for wires and cables

FIBROUS BRAID

70. A button-shaped carbon composition resistor microphone.

BUTTON MICROPHONE

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