Electronics Engineering Review Materials: Section 1 Module 25 | ECE Board Exam

(Last Updated On: March 16, 2020)

Electronics Review Materials: Section 1 Module 25

This is the Section 1 Module 25 of the compiled Electronics Review Materials taken from different sources including 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 25

1.    One of the most sensitive elements of semiconductor materials is Galena (crystalline form)

-    Lead sulfide

2.    Selenium rectifier replacement is

-    Silicon rectifier

3.    180⁰

-    Class C

4.    360⁰

-    Class A

5.    Emitter-Base, Base-Collector

-    Low, high (bias)

6.    For normal operation of a transistor what bias is Emitter-Base, Base-Collector junction

-    Forward, Reverse

7.    Two inductor series, in phase

-    2 LA (1 + k) H

8.    Who stated this “the present is theirs, the future which I work is mine”

-    Nikola Tesla

9.    Motor used in missile launcher

-    Amplidynes

10.    What is considered an efficient optoelectronic source but with only about 5% of its radiant flux falls within the visible wavelength

-    Tungsten Lamp

11.    Start of flowchart

-    Terminal

12.    For an electruminescent of green and red lights, which has the highest mobility?

-    GaP (Gallium phospide)

13.    Diodes has negative resistance region

-    Tunnel diode

14.    Precise voltage regulator

-    Zener Diode

15.    Which do not affect the voltage capacity of capacitor?

-    Area of plates

16.    Increase in bulk resistance

-    Reverse bias

17.    Decrease bulk resistance

-    Forward bias

18.    Thermistor at (20⁰C)

-    5K ohms

19.    Thermistor at (100⁰C)

-    100 ohms

20.    Selenium photodiode

-    Decrease resistance with increase in light intensity

21.    Common-collector

-    Emitter follower

22.    Tune oscillator

-    All of the above (hartley, collpits crystal)

23.    What is the back-to-back ratio of (a) power rectifier (b) signal diode

-    10:1; 300:1

24.    Green, Blue, orange

-    1N363

25.    Most danger to transistor

-    Heat

26.    What is the two junctions of a PNP

-    Emitter-Base, Base-Collector

27.    What is the majority of PNP, NPN?

-    Hole, Electron

28.    Same turn-on, turn-off time

-    GTO

29.    Transformer normally operated at 100 Hz to 150KHz

-    Converter transformer

30.    Unit of light intensity

-    Lumen/ft2

31.    Power density of sun at sea level

-    100 mW/cm2

32.    Not an standard failure rate for measuring SCR?

-    1.1%

33.    When amber is rubbed with fur, amber acquires ___ electricity


34.    When glasses rubbed wit silk, glass acquire _____ electricity

-    Vitreous

35.    How many free electrons are there in a cubic in. of silver?

-    1.68 x 1024

36.    Current gain of common-emitter configuration?

-    Beta

37.    Current gain of common-collector configuration?

-    Gamma

38.    Resistance increase, temperature decrease?

-    Negative temperature coefficient

39.    All metals are said to be

-    Positive Temperature Coefficient

40.    Tetrode transistor

-    3N345

41.    Principal node

-    Branches that can combine and multiply

42.    Diode that produce gain and oscillation

-    Tunnel diode

43.    Which of the following is a concept whereby a small voltage is generated by a conductor with a current in an external magnetic field?

-    Hall effect

44.    Ratio of IP/IV of GaAS

-    20:1

45.    Total current is equal to sum of its individual currents

-    Kirchoffs current law

46.    The tunning diode is a _____ dependent, variable ____.

-    Voltage, capacitor

47.    Range of variable resistance of PN junction

-    50 – 5K Hz

48.    Most popular used in class D amplifier


49.    It is a register in the CPU, devoted to a specific purpose of storing the address in memory of the next instruction to be executed.

-    Accumulator

50.    What device provides an increase in voltage or current without altering original signal.

-    Amplifier

51.    The intrinsic behavior of a semiconductor is cause by the existence of ____

-    Crystalline defect

52.    For what range of fixed regulated voltages do the series 78XX regulators provides regulation

-    +5V to +24V

53.    Shockley diode has how many terminals?

-    4

54.    What is the response time of LED

-    Less than 100 ns

55.    What is the ratio of the period of the output voltage to the period of the input voltage of full wave rectifier

-    0.5

56.    Percentage of current that flows to emitter

-    98

57.    How many Vcc connections does the 565 PLL used?

-   2

58.    Typical power dissipation rating of IC?

-    Less than 1W

59.    Value of form factor of a pure sine wave?

-    1.11

60.    How can you increase majority carriers and current flowing?

-   Increase battery voltage

61.    Symbol of cathode in a diode

-    Vertical bar

62.    Releases electron indirectly by the filament

-    Cathode

63.    What will be the carrier if electron leaves from the negative source going to the N-type material

-    Majority

64.    What element property represent the relative tendency of the atom to attract shared electron pair?

-    Electronegativity

65.    In a semiconductor device, a PN junction formed by alloying a suitable material

-    Alloy Junction

66.    Complete electronic circuit, containing transistors, diodes, resistors and capacitors process on and contained entirely contained within a single chip of silicon

-    Integrated Circuit

67.    Dynamic resistance of an SCR

-    0.01 – 0.1 ohms

68.    If full load is equal to No load

-    0%

69.    Front to back ratio, forward is low resistance reading and reverse is low resistance reading also

-    It is good

70.    LSI has

-    More than 100 gates

71.    Triggering anode gate for SCS devices

-    1.5 mA

72.    The ISO LIT Q1 16-pin Litronix optoisolator DIP contains ____ optoisolators

-    4

73.    Diode matching pair

-    1N325M

74.    To check bad transistor in a circuit what method should be use

-    Substitution

75.    The ___ model fails to account for the output impedance level of the device and the feed back effect from output to input.

-    re

76.    Thermistor temperature coefficient

-    Either PTC or NTC

77.    What is a small capacitance form by twisting together two insulated wires.

-    Gimmick capacitance

78.    Any resistor in common mesh

-    Two opposing currents

79.    What do you call a three-phase full wave rectifying circuit that uses six rectifying element

-    Gratz rectifier

80.    Where do you see average (dc) voltage in a power supply.

-    Capacitor Filter

81.    Application for pulsating dc

-    Battery charger

82.    Good stability

-    Combination bias

83.    What is the difference voltage if the input are an ideal in phase signal.

-    Common mode gain times twice the input signal

84.    Safety precaution before lifting a diode in circuit

-    All of the above (do not supply high voltage, do not apply excessive heat, do not pry)

85.    The current and voltage of PN junction can be found

-    Characteristic Curve

86.    Maximum temperature of LCD

-    60 degree C

87.    Process in which holes are produced in a crystal

-    Breaking of covalent bond

88.    “mono” and “lithos” means

-    Single stone

89.    Advantage of electron tube over semiconductor.

-    None of the above (can operate in high voltage)

90.    Starts the evolution of solid state device

-    Point contact transistor

91.    Pertaining to circuits and devices that used solid semiconductor

-    Solid state device

92.    Form when process of recombination occurs

-    Depletion region

93.    IBM first personal computer

-    1981

94.    Bismuth, Arsenic, antimony

-    Pentavalent

95.    Where current produced by excessive heat

-    Thermal runaway

96.    Perfect bonding

-    It is for rectification

97.    Which component sets the voltage across the load in a basic transistor shunt regulator

-    Both zener diode and transistor base emitter voltage

Section 1 Modules: Reviewers in Electronic Engineering

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