Electronics Engineering Review Materials: Section 1 Module 28

This is the Section 1 Module 28 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.

Electronics Review Materials: Section 1 Module 28

This is the Section 1 Module 28 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 28

Item

QUESTIONS:

ANSWERS:

1

What is the effect of adding an emitter resistor in the bipolar differential amplifier

Degenerate gain

2

SCS differs in SCR because it

Has 2 gate terminal

3

What is the slew rate of the 741 op-amp

0.5 V/µs

4

What is the approximate short-circuit output of 741 op-amp

25mA

5

Class B amplification can be used to obtain low distortion for audio applications

By connecting 2 identical bipolar transistors biased at cutoff of pinch-off in a push-pull configuration

6

The ratio of rms of the pulsating quantity to its mean value

Form factor

7

Biased of base-emitter and base-collector

Forward-reverse

8

Valence electron that able to break away from its parent atom

Free electron

9

When the needle of an analog ammeter indicates infinity, the resistor being measure is

Open

10

Oscilloscope

Displaying the analog voltage of individual signal

11

The amount of energy per charge available to move electron from one point to another in an electric circuit

Voltage

12

What is the region of amplifier operation in which the coupling and bypass capacitors acts as a short

Midband range

13

Across the _____ is where the average DC voltage exists

Capacitor filter

14

What is the control element of a simple series voltage regulator

Transistor

15

The operating voltage of a reference diode in a linear voltage regulator to obtain best temperature stability is approximately ___ volts

6

16

How many conductors per slot in quadruplex coil winding in the armature of DC generator

8

17

In filter designs, the distortion _____ as the order of chebyshev and butterworth increases

Increases

18

Which of the following is a type of cell which has an advantage of maintaining a fairly constant output under varying load condition

Mercury cell

19

Typical range of quality factor for crystal oscillators

20,000

20

Current flow of exactly 50% of the signal flow

Class B

21

Class C amplifiers has a circuitry efficiency of about ___ percent

85 – 90

22

The measurement of how “pure” or “real” inductor is

Q-factor

23

Type of flip-flop in which the data are entered and appear on the output of the same clock edge

Edge triggered flip-flop

24

_____ is a type of leadthrough programming that is convenient for continuous path control robots

Manual leadthrough

25

The channel in a zero-biased JFET is normally

In a conducting state

26

what is used to determine the time difference of the inputs, outputs and flip-flop states

State table

27

State table is consists of four sections labeled as ____, ____, ____ and ____

Present state, input, output, next state

28

What is the typical breakdown voltage of a DIAC

20 – 40 V

29

What is the TRIAC voltage capability in volts

1000 V

30

In arc welding, what is the typical range of current or the power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point

50 – 450 A

31

Which of the following is NOT a diamagnetic material

Manganese

32

Ferrites are made of what material

Ceramic

33

The typical value of the triggering anode gate for SCS devices is ___ mA

1.5

34

Type of robot programming where the program is prepared on a separate computer terminal and eliminates the need of leadthrough methods

Simulation programming

35

In a switch-mode power supply, the transistor switches at the rate typically in the range of

10kHz – 40kHz

36

Type of capacitor that is mainly found in SMD form and are used extensively in RF and microwave applications

Porcelain capacitor

37

What is the range of the required frequency of ECG signal

0.05 – 150 Hz

38

Typical amplitude of differential signals between electrodes over different parts of the brain in an EEG

10 – 300 microvolts

39

The visible blue or red glow caused by ionization of the air molecules when the high voltage of a sharp, pointed wire discharges into the atmosphere is called

Corona

40

What refers to the value of current below which a silicon controlled rectifier switches from conducting to the forward blocking region

Holding current

41

The purpose of an additional RC filter section in a power supply circuit

Decreases the AC voltage component

42

The current gain of a common base BJT configuration is

Just less than 1

43

What type of core that has high flux density like iron but is an insulator

Ferrite core

44

What type of core when used in a coil, has minimum eddy current losses due to its resistance

Ferrite core

45

Exhibits an equiripple amplitude in the pass band

Chebyshev filter

46

Exhibits maximum flatness possible in the pass band

Butterworth filter

47

What is the ratio of the DC output power at the load to the power rating (volt-ampere) of the transformer

Transformer utilization factor

48

What type of instrument transformer is used to measure or monitor the voltage on transmission lines and to isolate the metering equipment from the lines

Potential transformer

49

A circuit whose output voltage is proportional to the area under the curve of the input voltage is called

Integrator

50

A circuit whose output voltage is proportional to the slope of the input voltage is called

Differentiator

51

An amplifier with an output voltage proportional to the average of all the input voltages

Averaging amplifier

52

What refers to the force that holds the electrons in the orbit

Electrostatic force

53

What meter is used to measure AC currents, generally from the 60Hz AC power signal without breaking open the circuit

Amp-clamp probe

54

What is the frequency-determining component in the Wien bridge oscillator

Resistors and capacitors

55

The specified value of holding current for SCRs means that the

Device will turn off when the anode current falls below this value

56

Gas tungsten arc welding (GTAW) can produce a temperature up to _____ degree Fahrenheit

35,000

57

To ensure stable operation, op-amps are built with internal compensation circuitry, which also causes the very high open-loop gain to diminish with increasing frequency. The gain of reduction is referred to as

Roll-off

58

In logarithmic amplifier, where and how is the diode placed in the circuit to work as

Forward biased in the feedback, replacing the Rf of an inverting op-amp

59

Connecting the output to the input of the other

Cascading

60

An industrial welding technique where high frequency ultrasonic acoustic vibrations are locally applied to workpieces is called _____ welding

Ultrasonic

61

In a typical transistor amplifier active region, the VCE is usually ____ percent of the VCC

25 – 75

62

Generation of small voltage in the depth of a conductor

Hall effect

63

Quartz crystal when stress is applied

Piezoelectric effect

64

Reduction of voltage measurement in a voltmeter

Loading effect

65

Inability of a capacitor to completely discharge to zero

Dielectric effect

66

Typical range of a ceramic disk type capacitor

1pF – 0.22 F

67

Electromagnetic spectrum wavelength range in nanometer of germanium materials used in photodiode

400 – 1700

68

If the feedback signal (current or voltage) is applied in such a way that it is in-phase with the input signal and thus increases, the feedback is a ______ feedback

Positive

69

Regenerative feedback or direct feedback

Positive feedback

70

Temporarily stores the most recently used data

Cache memory

71

What refers to a non-volatile read/wire random access semiconductor memory in which data are stored in the floating charge of any type of FET

Flash memory

72

Has a 180° phase shift

RC phase shift oscillator

73

Most common local oscillator in a superheterodyne radio receiver

Colpitts

74

Composed of a diode, capacitor and transistor which is used to shift the level of a signal

Clamper

75

“all or nothing” gate

AND

76

What type of lead in ECG is used to record the voltage differential between the wrists and legs

Bipolar

77

The higher the Q-factor of the inductor,

The fewer losses are there

78

In industrial robotic arm, it must have a capacity from 1kg to ____ kg

300

79

In a good differential amplifier, what is the typical range of values of CMRR

80 – 100 dB

80

What type of battery is used in pacemakers

Lithium iodide

81

A pulsating DC voltage is which of the following application

Battery charger

82

What refers to the type of charging where the charger and the battery are always connected to each other to supply current in the load

Floating charge

83

Switch-mode power supply is a converter circuitry that consists of arrangement of ____, ____, ____ and ____

Inductor, capacitor, diode, transistor

84

What is a dc-dc converter with an unregulated input DC voltage and regulated output voltage

Switch-mode power supply

85

What is a relaxation oscillator where frequency can be changed by varying the output DC control voltage

Voltage controlled oscillator

86

To start oscillation, BA must be greater than 1 and the

Phase shift around the feedback network must be 180°

87

What is the ratio of the input impedance with series feedback to that without feedback

1 + BA

88

To obtain self-sustained oscillation, the condition must be which of the following

BA = 1

89

____ motor is solar-powered, magnetically levitated electric motor wich consists of a four-sided rotor

Mendocino

90

Which of the following is a disadvantage of a CMOS device

They can be damaged by electrostatic discharges

91

What is the typical range of ferrite relative permeability

50 – 200 V

92

_____ provides shortcut for finding the common voltage between any number of parallel branch

Reciprocity theorem

93

The current gain of a Darlington pair is

Superbeta

94

Difference between the two op-amps input currents

Input offset current

95

_____ rectifier are formed from stacks of square or round, aluminum or steel plated with a 1 micrometer of bismuth or nickel

Selenium

96

Silicon carbide semiconductor materials are used in thyristors because it is capable to operate at temperature of up to ____ degree Celsius

350

97

Force applied in the reverse direction to reduce flux density to zero

Coercive force

98

Time between the changing state of the input and the beginning of the response in the output

Delay time

99

The process of shrinking the size and power dissipation of an electronic circuit which uses surface mount technology

Microminiaturization

100

Class B amplification can be used to obtain low distortion for audio applications

By connecting 2 identical bipolar transistors biased at cutoff of pinchoff in a push-pull configuration

Section 1 Modules: Reviewers in Electronic Engineering


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