DE 1st Semester Exam

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95 Terms

1
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Capacitors resist the flow of current through a circut

False

2
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The human body, through static electricity, cannot be charged more than 15 volts

False

3
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Static electricity is not usually dangerous to humans but it is definitely dangerous to electronics

True

4
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You should be careful not to touch sources of high voltage, even when they are not powered

True

5
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The secret to soldering successfully is to melt the solder quickly

False

6
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_________ is the flow of electricity

Current

7
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At currents as low as _________, death is possible

50mA

8
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_______ is electrical potential

Voltage

9
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The most common component in electronics are

resistors

10
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__________ is a metal allow that melts at a significantly lower temperature than the metals it connects

Solder

11
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_________ usually look like a can with legs (leads) coming from the bottom

Electrolytic capacitors

12
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Lightning is the discharge of _______ between the atmosphere and the ground

static electricity

13
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The voltage difference between the atmosphere and the ground can be in the ________ of volts

millions

14
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The more _____ applied to a person's body, the more current will flow, and the more dangerous the situation becomes.

voltage

15
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resistors are _____; in other words, the can go into a circuit in either direction

Not polarized

16
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______ is done to attach components like resistors and capacitors to circuit boards

Soldering

17
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______ results when a stored charge rapidly discharges

static electricity

18
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__________ components are those components that must be inserted into a circuit in the proper direction to function

Polarized

19
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Wire solder, usually used when building boards by hand, contains solder and _________

Flux

20
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_________ are typically found as axial-lead packages

resistors

21
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If we touch one end of a wire to the negative side of a 9V battery and touch the other end of the wire to the positive side of the battery, the electrons move toward the positive side and flow back into the wire from the negative side.

T

22
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The human body is approx ____________ water by weight

60%

23
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______ states that voltage across a component is equal to the resistance of the component multiplied by the current through the component

Ohm's law

24
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It is very difficult for _____ to combine to form molecules

Noble elements

25
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A _________ is a junction of electronic components

Node

26
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The typical issue when measuring current is that the _________ must receive the exact same current as the resistor to be measured

meter

27
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A device with hidden interconnections on which we can build a prototype circuit is a _______.

breadboard

28
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The current entering a node must equal the current leaving the node

T

29
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Protons attract electrons

T

30
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The International system of units has ____ base units

Seven

31
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A circuit built functionally the same as a circuit that is to be tested is a _____

prototype

32
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For current to flow, we need to replenish the _______ at the negative end so they can flow to the positive end

electrons

33
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A _____ is a copper line on a circuit board connecting one component to another; it is a path for current to flow on a circuit board

Trace

34
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As more electronic systems have been designed using digital technology, devices have become smaller and less powerful

F

35
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A digital audio system makes a copy of the waveform

F

36
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A digital audio system stores a code, a series if amplitude numbers, that tells the compact disc player how to re-create the original sound every time a disc is played

T

37
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The binary number system is a positional notation system

T

38
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Hexadecimal numbers are primarily used as a shorthand of binary

T

39
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The signal on a CD is sampled ___________ times a second

44,100

40
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assigning the digit 1 to a logic HIGH and digit 0 to logic LOW is called ___________

positive logic

41
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The hexidecimal system is based on powers of

16

42
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A momentary variation of voltage from one logic level to the opposite level and back again is called...

pulse

43
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The rightmost bit of a binary number is the

least significant bit

44
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Which of the following does not apply to digital signals

Continuously Variable

45
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A __________ system is a system of writing numbers where the value of a digit depends not only on the digit, but also on its placement within a number

positional notation

46
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After the binary system, ______ numbers are the most often used in digital applications

hexadecimal

47
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_________ is a fraction of the total period that a digital waveform is in the HIGH state

Duty Cycle

48
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______ is a time-varying sequence of logic HIGHs and LOWs that repeats over a specified period of time.

Periodic waveform

49
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A special case of symmentrical periodic waveform is a:

Clock signal

50
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_________ is a system in which low represents binary digit 1 and high represents 0

Negative logic

51
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A truth table is a list of output levels of a circuit corresponding to all different_______

input combinations

52
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For binary numbers from 0000 to 1111, the decimal equivalents are _____.

0 to 15

53
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Two commonly used methods to convert decimal to binary

sum of powers of 2 and repeated division by 2

54
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The logical sum is the same as the "arithmetic sum"

F

55
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Not every chip requires power and ground

F

56
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The NOT function has one input and one output

T

57
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TTL and CMOS devices differ not in their logic functions, but in their construction and electrical characteristics

T

58
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For the NAND gate we can say all inputs HIGH make the output HIGH

F

59
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How many basic logic functions are there that can be combined to make any other logic?

Three

60
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A gate can be categorized by examining three attributes: output, input, and ______.

Shape

61
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"electronic devices that conducts current in one direction only and illuminates when it is conducting"

Light-emitting diode

62
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A duel in-line package (DIP) has two parallel rows of pins; the standard spacing between pins in one row is

0.1" (or 100 mil)

63
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A medium-scale integration is an integrated circuit having the equivalent of ___________ gates in one package

12 to 100

64
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_______________ is a circuit board in which connections between components are made with lines of copper on the surfaces of the board

printed circuit board

65
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___________ can be used as electronic switches to block or allow passage of digitial waveforms

Logic Gates

66
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_______ gate combines all of its inputs in an AND function then inverts the total result

NAND

67
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An _______ is shown by a bubble or an arrow symbol on the affected terminal.

active LOW

68
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When inverting gates such as NAND and NOR are enabled, they will invert an input signal passing it to the
gate output; in other words, they transmit the signal in _______.

complement form

69
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________ is a sophisticated technology that relies on automatic placement of chips and soldering of pins onto the surface of a circuit board, not through holes in the board

SMT

70
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Digital data are transferred from more than one source to one or more destinations along a common wire or
_____.

Bus

71
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___________, also called a NOT gate, is a logic gate that changes its input logic level to the opposite state

inverting buffer

72
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A _______________ is a list of all possible input values to a digital circuit, listed in ascending binary order, and the output response for each input combination

Truth Table

73
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The only place a chip gets its required power is through the:

Vcc pin

74
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what does SPST stand for

Single-pole single-throw

75
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What simple rhyme that can help you remember how to use DeMorgan's theorems

Break the line, charge the sign

76
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When grouping terms for simplification, every pair of terms must have at least one term that belongs to that pair.

True

77
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The number of cells in a K-Map is always a power of 2, usually 4, 8, or 16

True

78
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The more digital components or gates used inside a circuit, the more difficult it might be to simplify the circuit

False

79
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In a K-map, a cell should never be grouped more than once

False

80
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Most digital circuits require multiple gates

True

81
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________ is the process of creating a logic circuit from a description such as a boolean equation or truth table

Synthesis

82
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When designing a combinational logic circuit, you are ultimately looking for a:

Boolean equation

83
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A(n) __________ is a group of eight adjacent cells

Octet

84
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A combinational logic circuit is one in which two ore more gates are connected together to combine several:

Boolean inputs

85
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There are two ways of labeling cell coordinates: 1. numerically or 2. by_____

true and complement variables

86
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A yellow light, called the ALERT light, illuminates when:

Two ore more sensors indicate an out-of-range condition

87
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The inputs to a circuit has values from ________

0 to 3

88
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Boolean functions are governed by:

an order of precedence

89
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When two or more gates are connected together, they form a

logic gate network

90
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Which of the following is an example of a product term

A'C'

91
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One way to simplify a ____ is to look for pairs of product terms that are different by just one variable, then factor out what is common to the term, as you would do in other types of algebra

sum-of-products

92
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______is a sum term in a boolean expression where all possible variables appear once in true or complement form

Maxterm

93
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A ______ is a variable around the edge of a K-map that represents an input variable (e.g. A, B, C, or D) for the boolean expression to be simplified

Cell coordinate

94
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The maximum simplification of a boolean expression is achieved only if the circled groups of cells in its K-map are ________ and there are as few groups as possible

as large as possible

95
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______________ is the practice of drawing gates in a logic diagram so that inverting outputs connect to inverting inputs and noninverting outputs connect to noninverting inputs.

Bubble to bubble convention