Digital Electronics Principles And Applications 8Th Edition By Roger Tokheim – Test Bank
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Sample Test
Chapter 03
True / False Questions
1. The
basic building block of any digital circuit is a flip-flop.
True False
2. Positive
logic is most often used in digital electronics.
True False
3. The
Boolean expression is a universal language used by engineers and technicians in
analog electronics.
True False
4. The
unique output of the AND function is a high output only when all inputs are high.
True False
5. The
AND gate is sometimes called the “any or all” gate.
True False
6. The
NOT circuit has one input and one output.
True False
7. The
terms negated, complemented, and inverted mean the same thing.
True False
8. The
unique output of the NAND function is a low output only when all inputs are
low.
True False
9. The
NOR gate is not the same as the OR gate in operation.
True False
10.
The exclusive NOR gate is sometimes referred to as the “odd but
not even gate.”
True False
11.
Floating inputs on CMOS ICs can harm the IC.
True False
12.
Manufacturers’ data manuals include traditional logic symbols
and are recently including the newer IEEE functional logic symbols.
True False
13.
The bubble at the input of an inverter indicates that the active
state is high.
True False
14.
A pull-down resistor is often attached to the input of a gate in
order to pull the input to the gate low when input switch is open.
True False
15.
It is uncommon for logic functions to be programmed using
software.
True False
16.
When using PBASIC, remark statements are used to clarify the
program and are not executed by the microcontroller.
True False
17.
The unique characteristic of the XOR gate is that it produces a
high output only when an odd number of high inputs are present.
True False
18.
NAND gates are not as widely used as are other logic gates.
True False
19.
Invert bubbles at the input of the AND gate convert it into a
NOR function.
True False
20.
The CMOS family is a very low power and widely used family of
digital ICs.
True False
Multiple Choice Questions
21.
Which logic gate provides a low output only when an odd number
of inputs are high?
A. and
B. or
C. exclusive OR
D. exclusive NOR
22.
Which type gate is generally more widely available than any
other gate?
A. and
B. or
C. nor
D. nand
23.
How many two-input NAND gates are required to produce a
two-input exclusive OR gate?
A. 1
B. 2
C. 3
D. 4
24.
Which of the following could be a Boolean expression for a three-input
or gate?
A. A + B = Y
B. A + B + C = Y
C. A ∙ B ∙ C = Y
D. A = Y
25.
Which family of digital ICs uses parts comparable to IGFETs?
A. bipolar
B. CMOS
C. DIP
D. SMT
26.
The letters LS in the core part number of a 7400 series IC stand
for
A. CMOS
B. Fast Fairchild
C. low signal
D. low-power Schottky
27.
If caution is not exercised, CMOS ICs can be damaged by
A. tying unused inputs to ground
B. tying unused inputs to VDD
C. static charges
D. using them as NAND gates
28.
On a logic probe, the ______ lead is connected to the positive
(+) of the power supply.
A. black
B. white
C. red
D. green
29.
In practical electronic equipment most digital ICs are mounted
on
A. a chassis
B. a printed circuit board
C. an analog IC
D. a ribbon cable
30.
The first step in troubleshooting should be to
A. use your senses
B. replace the ICs
C. replace the power supply
D. measure all resistors
31.
Which of the following is sometimes referred to as the “all or
nothing” gate?
A. OR
B. NAND
C. NOR
D. AND
32.
A logic _______________ is a circuit that can decide to say yes
or no at the output based upon inputs.
A. function
B. probe
C. gate
D. switch
33.
In Boolean algebra is the algebra of _______________.
A. logic
B. digital circuitry
C. engineers
D. binary
34.
The _________ for a gate gives all the possible input
combinations and the resulting outputs.
A. logic function
B. truth table
C. logic symbol
D. invert function
35.
The NOT circuit is another name for a(n) _______________.
A. encoder
B. decoder
C. inverter
D. all or nothing gate
36.
The noninverting _______________ serves no logical purpose, but
is used to supply greater drive current at its output.
A. drive current
B. invert bubble
C. switch
D. buffer
37.
The little invert bubble on the right end of a logic symbol means
to invert the _______________.
A. output
B. input
C. logic gate
D. logic function
38.
The unique output from the NOR gate is _______________ only when
all inputs are ____________.
A. low, low
B. high, high
C. low, high
D. high, low
39.
ICs that are much smaller and have shorter pins bent to be
soldered to the traces on the top of a PC board are commonly called
_______________ packages.
A. NAND
B. AND
C. LED
D. SMT
40.
This is the logic symbol for a(n)
A. AND gate
B. NOT gate (inverter)
C. OR gate
D. ANAND gate
41.
If a National Semiconductor digital DIP IC had the number
74HC08N printed on the top, what type of component would it be?
A. PPI
B. XS3
C. TTL
D. CMOS
42.
When using 4000 series CMOS, what is the pin labeled that is
connected to the positive of the power supply?
A. VPP
B. VSS
C. VDD
D. GND
43.
This is the logic symbol for what type of gate?
A. XOR
B. OR
C. NOR
D. AND
44.
This is an alternative logic symbol for what type gate?
A. xor
B. or
C. nor
D. and
True / False Questions
1. (p. 43)The
basic building block of any digital circuit is a flip-flop.
FALSE
The logic gate is the basic building block of any digital
circuit.
Difficulty: 1 Easy
2. (p. 44)Positive
logic is most often used in digital electronics.
TRUE
Difficulty: 2 Medium
3. (p. 45)The
Boolean expression is a universal language used by engineers and technicians in
analog electronics.
FALSE
The Boolean expression is used by engineers and technicians in
digital electronics.
Difficulty: 2 Medium
4. (p. 45)The unique
output of the AND function is a high output only when all inputs are high.
TRUE
Difficulty: 2 Medium
5. (p. 46)The
AND gate is sometimes called the “any or all” gate.
FALSE
The OR gate is sometimes called the “any or all” gate.
Difficulty: 1 Easy
6. (p. 45)The
NOT circuit has one input and one output.
TRUE
Difficulty: 1 Easy
7. (p. 48)The
terms negated, complemented, and inverted mean the same thing.
TRUE
Difficulty: 2 Medium
8. (p. 46)The
unique output of the NAND function is a low output only when all inputs are
low.
FALSE
The unique output from the NAND gate is a LOW only when all
inputs are HIGH.
Difficulty: 2 Medium
9. (p. 51)The
NOR gate is not the same as the OR gate in operation.
TRUE
Difficulty: 2 Medium
10.
(p. 49)The exclusive
NOR gate is sometimes referred to as the “odd but not even gate.”
FALSE
The exclusive OR gate is sometimes referred to as the “odd but
not even gate.”
Difficulty: 3 Hard
11.
(p. 71)Floating
inputs on CMOS ICs can harm the IC.
TRUE
Difficulty: 2 Medium
12.
(p. 72)Manufacturers’
data manuals include traditional logic symbols and are recently including the
newer IEEE functional logic symbols.
TRUE
Difficulty: 3 Hard
13.
(p. 73)The
bubble at the input of an inverter indicates that the active state is high.
FALSE
The bubble at the input of an inverter indicates that the active
state is low.
Difficulty: 3 Hard
14.
(p. 75)A
pull-down resistor is often attached to the input of a gate in order to pull
the input to the gate low when input switch is open.
TRUE
Difficulty: 2 Medium
15.
(p. 77)It is
uncommon for logic functions to be programmed using software.
FALSE
Logic functions are commonly programmed using software.
Difficulty: 2 Medium
16.
(p. 79)When
using PBASIC, remark statements are used to clarify the program and are not
executed by the microcontroller.
TRUE
Difficulty: 3 Hard
17.
(p. 53)The
unique characteristic of the XOR gate is that it produces a high output only
when an odd number of high inputs are present.
TRUE
Difficulty: 2 Medium
18.
(p. 56)NAND
gates are not as widely used as are other logic gates.
FALSE
NAND gates are more widely available than most other kinds of
gates.
Difficulty: 2 Medium
19.
(p. 61)Invert
bubbles at the input of the AND gate convert it into a NOR function.
TRUE
Difficulty: 3 Hard
20.
(p. 62)The
CMOS family is a very low power and widely used family of digital ICs.
TRUE
Difficulty: 1 Easy
Multiple Choice Questions
21.
(p. 54)Which
logic gate provides a low output only when an odd number of inputs are high?
A. and
B. or
C. exclusive OR
D. exclusive
NOR
Difficulty: 3 Hard
22.
(p. 56)Which
type gate is generally more widely available than any other gate?
A. and
B. or
C. nor
D. nand
Difficulty: 2 Medium
23.
(p. 56)How
many two-input NAND gates are required to produce a two-input exclusive OR
gate?
A. 1
B. 2
C. 3
D. 4
Difficulty: 3 Hard
24.
(p. 57)Which
of the following could be a Boolean expression for a three-input or gate?
A. A + B = Y
B. A
+ B + C = Y
C. A ∙ B ∙ C = Y
D. A = Y
Difficulty: 1 Easy
25.
(p. 62)Which
family of digital ICs uses parts comparable to IGFETs?
A. bipolar
B. CMOS
C. DIP
D. SMT
Difficulty: 2 Medium
26.
(p. 63)The
letters LS in the core part number of a 7400 series IC stand for
A. CMOS
B. Fast Fairchild
C. low signal
D. low-power
Schottky
The letters “LS” in the center of the core number designate the
type of TTL circuitry used in the IC.
Difficulty: 3 Hard
27.
(p. 62)If
caution is not exercised, CMOS ICs can be damaged by
A. tying unused inputs to ground
B. tying unused inputs to VDD
C. static
charges
D. using them as NAND gates
Care must be taken when removing the 4081 from its conductive
foam storage because CMOS ICs can be damaged by static charges.
Difficulty: 1 Easy
28.
(p. 69)On a
logic probe, the ______ lead is connected to the positive (+) of the power
supply.
A. black
B. white
C. red
D. green
The red lead is connected to the positive (1) of the power
supply while the black lead of the logic probe is connected to the negative (2)
or GND of the power supply.
Difficulty: 1 Easy
29.
(p. 68)In
practical electronic equipment most digital ICs are mounted on
A. a chassis
B. a
printed circuit board
C. an analog IC
D. a ribbon cable
Difficulty: 1 Easy
30.
(p. 64)The
first step in troubleshooting should be to
A. use
your senses
B. replace the ICs
C. replace the power supply
D. measure all resistors
Feel the flat top of the ICs to determine if they are hot. Some
ICs operate cool; others run slightly warm. CMOS ICs should always be cool.
Look for broken connections, solder bridges, broken PC board traces, and bent
IC pins. Smell for possible overheating. Look for signs of excessive heat, such
as discoloration or charring.
Difficulty: 1 Easy
31.
(p. 43)Which
of the following is sometimes referred to as the “all or nothing” gate?
A. OR
B. NAND
C. NOR
D. AND
Difficulty: 1 Easy
32.
(p. 44)A
logic _______________ is a circuit that can decide to say yes or no at the
output based upon inputs.
A. function
B. probe
C. gate
D. switch
Difficulty: 1 Easy
33.
(p. 45)In
Boolean algebra is the algebra of _______________.
A. logic
B. digital circuitry
C. engineers
D. binary
Difficulty: 1 Easy
34.
(p. 44)The
_________ for a gate gives all the possible input combinations and the
resulting outputs.
A. logic function
B. truth
table
C. logic symbol
D. invert function
Difficulty: 1 Easy
35.
(p. 48)The
NOT circuit is another name for a(n) _______________.
A. encoder
B. decoder
C. inverter
D. all or nothing gate
Difficulty: 2 Medium
36.
(p. 48)The
noninverting _______________ serves no logical purpose, but is used to supply
greater drive current at its output.
A. drive current
B. invert bubble
C. switch
D. buffer
Difficulty: 2 Medium
37.
(p. 50)The
little invert bubble on the right end of a logic symbol means to invert the
_______________.
A. output
B. input
C. logic gate
D. logic function
Difficulty: 2 Medium
38.
(p. 52)The
unique output from the NOR gate is _______________ only when all inputs are
____________.
A. low, low
B. high, high
C. low,
high
D. high, low
Difficulty: 2 Medium
39.
(p. 63)ICs
that are much smaller and have shorter pins bent to be soldered to the traces
on the top of a PC board are commonly called _______________ packages.
A. NAND
B. AND
C. LED
D. SMT
Difficulty: 2 Medium
40.
(p. 48)
This is the logic symbol for a(n)
A. AND gate
B.
NOT gate (inverter)
C. OR gate
D. ANAND gate
Difficulty: 1 Easy
41.
(p. 63)If a
National Semiconductor digital DIP IC had the number 74HC08N printed on the
top, what type of component would it be?
A. PPI
B. XS3
C. TTL
D. CMOS
Difficulty: 3 Hard
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