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Electronics Engineering Review Materials: Section 1 Module 22

Electronics Review Materials: Section 1 Module 22

This is the Section 1 Module 22 of the compiled Electronics Review Materials taken from different sources including but not limited to Electronics books, past Board Exams Questions, Journals and the Internet. This particular reviewer 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 Reviewers: Section 1 Module 22

1. Line Regulation can be determined :

When changes in output voltage and input voltage

2. Ideally midrange in amplifier:

Remains constant with frequency

3. A voltage occurs between anode and cathode of an SCR is called:

Holding Voltage

4. An LED

Emits light when forward biased

5. Typical range of power dissipation for a semiconductor to be considered as “low power” or “small signal”

Less than 1 watt

6. A semiconductor that is rare and in a minute quantity of many metal sulphide

Germanium

7. A PUT

Is triggered on and off by gate to anode voltage

8. A colpitts, Hartley, Clapp

LC oscillator

9. A term pole in filter terminology is:

Single RC circuit

10. Compare the visible red LED to infrared LED

IR led produce longer wavelength

11. A transistor operating in high switching circuit, the most important factor to be considered is:

Reverse recovery time

12. When the two inputs of multiplier that combined together, the device operates as:

Squaring circuit

13. In order to use JFET as variable resistor:

Biased in ohmic region

14. A sallen key filter

A second order filter

15. Max efficiency of Class A power amplifier:

25%

16. In differentiator, the feedback element is:

Resistor

17. Among a given semiconductor below, which has the highest mobility?

Indium Antimonide

18. A semiconductor that is good for high-temperature applications

Silicon Carbide

19. In 0 level detector, the output changes when the input

Crosses zero

20. In a moving coil ammeter, a _______ must be in series in a coil to compensate temperature variation

Swamping resistor

21. Developed UNIVAC and ENIAC

Presper Eckert and John Mauchly

22. UNIVAC was created in

Pennsylvania

23. A negative resistance characteristic diode

Tunnel diode

24. A pass transistor in a voltage regulator

Used to increase current the regulator can handle

25. In amplifier, the gain between upper and lower critical frequency is called:

Critical frequency gain

26. A D-MOSFET is used in

Both enhancement and depletion mode

27. The number of logic gates of the same family that can be connected to the input of a particular gate without degrading the circuit performance

Fan-in

28. The electrons of a copper atom contains

29

29. In amplitude modulation, the pattern produced in the peak carrier signal is

Envelope

30. OTA is primarily a

Voltage to current amplifier

31. A Wien bridge oscillator is used in

Positive feedback

32. A peak current of a Class A amplifier power amplifier delivers on a load depends on

Quiescent current

33. A programmable manipulator that moves a part, material, device

Industrial robot

34. If the input is a rectangular pulse, the output of an integrator is a

Ramp

35. A condition for oscillation

Phase shift in positive feedback loop is 1

36. Load regulation

When load changes, the output voltage is constant

37. Line regulation

When input current changes, the output voltage stays constant

38. A 9 address input, how many memory storage location

512

39. A LAN in which each user’s computer stores its own data is called

Peer-to-peer LAN

40. When using negative feedback in op-amp the gain-bandwidth product

Stays the same

41. How much impurity concentration is needed for a sample of silicon to charge its electrical property from a poor conductor to a good conductor

One part per million

42. All MOS devices are subject to damage from

Excessive heat

Electrostatic damage

Excessive voltage

43. Typically the energy required for valence electron to move to conduction band, for a doped semiconductor

0.05 eV

44. The input Miller capacitances of an amplifier is dependent, in part, on

The voltage gain

45. An infrared LED is optically coupled by photodiode, when LED is turn off, the ammeter in series with the reverse biased photodiode is

Decrease

46. When the angle of incidence of light ray is greater than the critical angle, the light is

Reflected

47. An instrument that used the force of repulsion between fixed and movable magnetized iron vane or a force between a coil and pivoted vane shape of soft iron that moves indicating pointer

Vain – type instrument

48. A specified type of holding current for an SCR means that

The device will turn off when the anode current falls from this value

49. The IF in a receiver is

The difference between the local frequency oscillator and RF carrier frequency

50. In an AM demodulator basically

Linear multiplier followed by low pass filter

51. In a scaling Adder, the input resistances are

Proportional to each weight of its input

52. The lower critical frequency of a low pass filter is

0 kHz

53. To stop conducting during an SCR is also conducting

Interrupt anode current

54. An op-amp that operates in single ended differentiator mode

One input is in the ground and the signal is to other

55. A state variable filter is

Summing amplifier and two integrators

56. A certain common source amplifier has a voltage of 10. If the source bypass capacitor is removed

The voltage gain will decrease

57. In which trigger diode has the highest holding voltage

Bidirectional trigger diac

58. E- MOSFET used in high switching application because of

Threshold characteristic

59. In which bipolar logic circuit is the faster?

ECL

60. In an AM receiver, the local oscillator always produce frequency above incoming RF by

455 kHz

61. For maximum output, class A power amplifier maintain a value of quiescent current

One half the peak load current

62. A condition for oscillation

Phase shift around the feedback loop of 0 degree

63. Second condition of oscillation

A gain of 1 around the feedback loop

64. In a switching regulator, the control transistor is conducting

Part of the time

65. In a linear regulator, the control transistor is conducting

All of the time

66. AN OTA, transconductance is controlled by

Bias current

67. When diodes operates forward biased

The current produced both by holes and electrons

68. In many stage isolation amplifier are connected by

A capacitor

69. In logic circuitry, diode is the logic element and the transistor acts as inverting amplifier

DTL

70. The two inputs of a mixer

The modulated carrier signal and the local oscillator signal

71. A semiconductor which commonly used near infrared

Germanium

72. A peak detector consists of

Comparator, diode and capacitor

73. The complete diode model

Barrier potential, reverse resistance and dynamic forward resistance are taken into account

74. Compared, incandescent bulb from high intensity LED

Longer life, less power and brighter

75. Compared oscillator from amplifier, oscillator is

Requires no input signal

76. Advantage of OLED from conventional LED

Both uses organic element in place of a PN-junction and can implemented by the use of Inkjet printing

77. The sampling circuit samples a signal at a minimum of

Twice of the input of the signal

78. The zero level detector use as

Comparator

79. In order to handle all combinations of input voltage polarities, the multiplier must have

Four quadrant capability

80. A silicon diode which is open, DMM generally indicates

0L

81. In DMM, an open transistor PN junction

0L

82. Next to holding interval is______interval in an automatic welding system

Release

83. In a high pass

Above the critical frequency

84. An output bounding in comparator

Limits the output levels

85. Main feature of crystal oscillator

Stability

86. An N- channel D – MOSFET with positive VGS operating in

Enhancement mode

87. At cut-off JFET channel

Completely closed by depletion region

88. In voltage approximation, the forward biased based emitter voltage is

0.7 V

89. When the silicon diode run in forward biased, the DMM reading is

Approximately by 0.7 V

90. Binary sequence

Binary Counter

91. Precise frequency and phase usually over wide range

Signal generator

Section 1 Modules: Reviewers in Electronic Engineering

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