Digital Concepts

Q1: Convert the fractional decimal number 6.75 to binary.

A 0111.1100

B 0110.1010

C 0110.1100

D 0110.0110

Q2: In the decimal numbering system, what is the MSD?

A The middle digit of a stream of numbers

B The digit to the right of the decimal point

C The last digit on the right

D The digit with the most weight

Q3: Which format can send several bits of information faster?

A Parallel

B Serial

C Both are the same

D Cannot tell

Q4: PLCC packages have leads on ________.

A one side

B two sides

C three sides

D four sides

Q5: Convert the fractional binary number 0001.0010 to decimal.

A 1.40

B 1.125

C 1.20

D 1.80

Q6: Which format requires fewer conductors?

A Parallel

B Serial

C Both are the same

D Cannot tell

Q7: Serial format means digital signals are:

A sent over many conductors simultaneously.

B sent over one conductor sequentially.

C sent in groups of eight signals.

D sent in binary coded decimal.

Q8: In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________.

A 0%

B 25%

C 50%

D 100%

Q9: What is the decimal value of 2?

A 2

B 4

C 6

D 8

Q10: A classification of ICs with complexities of 12 to 100 equivalent gates on a chip is known as ________.

A SSI

B MSI

C LSI

D VLSI

Q11: The parallel transmission of digital data:

A is much slower than the serial transmission of data.

B requires only one signal line between sender and receiver.

C requires as many signal lines between sender and receiver as there are data bits.

D is less expensive than the serial method of data transmission.

Q12: Digital signals transmitted on a single conductor (and a ground) must be transmitted in:

A slow speed.

B parallel.

C analog.

D serial.

Q13: The holes through a PC board are ________.

A smaller with SMT than with through-hole mounting

B larger with SMT than with through-hole mounting

C the same size as with through-hole mounting

D usually unnecessary

Q14: What is a digital-to-analog converter?

A It takes the digital information from an audio CD and converts it to a usable form.

B It allows the use of cheaper analog techniques, which are always simpler.

C It stores digital data on a hard drive.

D It converts direct current to alternating current.

Q15: Any number with an exponent of one is equal to:

A zero.

B one.

C two.

D that number.

Q16: A pulse has a period of 15 ms. Its frequency is ________.

A 6.66 Hz

B 66.66 Hz

C 666.66 Hz

D 15 Hz

Q17: A classification of ICs with complexities of 100 to 10,000 equivalent gates per chip is known as ________.

A SSI

B MSI

C LSI

D VLSI

Q18: A decoder converts ________.

A noncoded information into coded form

B coded information into noncoded form

C HIGHs to LOWs

D LOWs to HIGHs

Q19: Which of the following is not an analog device?

A Thermocouple

B Current flow in a circuit

C Light switch

D Audio microphone

Q20: The output of a NOT gate is HIGH when ________.

A the input is LOW

B the input is HIGH

C the input changes from LOW to HIGH

D voltage is removed from the gate

Q21: Digital representations of numerical values of quantities may BEST be described as having characteristics:

A that are difficult to interpret because they are continuously changing.

B that vary constantly over a continuous range of values.

C that vary in constant and direct proportion to the values they represent.

D that vary in discrete steps in proportion to the values they represent.

Q22: In positive logic, ________.

A a HIGH = 1, a LOW = 0

B a LOW = 1, a HIGH = 0

C only HIGHs are present

D only LOWs are present

Q23: What kind of logic device or circuit is used to store information?

A Counter

B Register

C Inverter

D Buffer

Q24: What has happened to the advances in digital technologies over the past three decades?

A Slowed down considerably

B Continued to increase, but at a decreasing rate

C Made excellent progress

D Nothing short of phenomenal

Q25: The range of voltages between VL(max) and VH(min) are ________.

A unknown

B unnecessary

C unacceptable

D between 2 V and 5 V

Q26: What is the typical invalid voltage for a binary signal?

A 0.7–2.8 volts

B 0.8–3 volts

C 0.8–2 volts

D 0.7–2.5 volts

Q27: Parallel format means that:

A each digital signal has its own conductor.

B several digital signals are sent on each conductor.

C both binary and hexadecimal can be used.

D no clock is needed.

Q28: How many unique symbols are used in the decimal number system?

A One

B Nine

C Ten

D Unlimited

Q29: Give the decimal value of binary 10010.

A 610

B 910

C 1810

D 2010

Q30: What is the decimal value of 2?

A 2

B 4

C 6

D 8

Q31: The generic array logic (GAL) device is ________.

A one-time programmable

B reprogrammable

C a CMOS device

D reprogrammable and a CMOS device

Q32: Convert the fractional binary number 10010.0100 to decimal.

A 24.50

B 18.25

C 18.40

D 16.25

Q33: A periodic digital waveform has a pulse width (tw) of 6 ms and a period (T) of 18 ms. The duty cycle is ________.

A 3.3%

B 33.3%

C 6%

D 18%

Q34: Which of the following is a semiconductor memory?

A RAM

B MAR

C CD-ROM

D CD

Q35: The frequency of a pulse train is 2 kHz. The pulse period is ________.

A 5 ms

B 50 ms

C 500 s

Ds

Q36: A common instrument used in troubleshooting a digital circuit is a(n) ________.

A logic probe

B oscilloscope

C pulser

D all of the above

Q37: Give the decimal value of binary 10000110.

A 13410

B 14410

C 11010

D 12610

Q38: What is the decimal value of 2–1 ?

A 0.5

B 0.25

C 0.05

D 0.1

Q39: A multiplexer has ________.

A one input and several outputs

B one input and one output

C several inputs and several outputs

D several inputs and one output

Q40: A flip-flop has ________.

A one stable state

B no stable states

C two stable states

D none of the above

Q41: What is an analog-to-digital converter?

A It makes digital signals.

B It takes analog signals and puts them in digital format.

C It allows the use of digital signals in everyday life.

D It stores information on a CD.

Q42: A type of digital circuit technology that uses bipolar junction transistors is ________.

A TTL

B CMOS

C LSI

D NMOS

Q43: Any number with an exponent of zero is equal to:

A zero

B one

C that number

D ten

Q44: A full subtracter circuit requires ________.

A two inputs and two outputs

B two inputs and three outputs

C three inputs and one output

D three inputs and two outputs

Q45: An encoder converts ________.

A noncoded information into coded form

B coded information into noncoded form

C HIGHs to LOWs

D LOWs to HIGHs

Q46: The output of an AND gate is LOW ________.

A all the time

B when any input is LOW

C when any input is HIGH

D when all inputs are HIGH

Q47: The output of an OR gate is LOW when ________.

A all inputs are LOW

B any input is LOW

C any input is HIGH

D all inputs are HIGH

Q48: Which of the following statements does NOT describe an advantage of digital technology?

A The values may vary over a continuous range.

B The circuits are less affected by noise.

C The operation can be programmed.

D Information storage is easy.

Q49: A demultiplexer has ________.

A one data input and a number of selection inputs, and they have several outputs

B one input and one output

C several inputs and several outputs

D several inputs and one output

Q50: How many binary bits are necessary to represent 748 different numbers?

A 9

B 7

C 10

D 8

Q51: A DAC changes ________.

A an analog signal into digital data

B digital data into an analog signal

C digital data into an amplified signal

D none of the above

Q52: The rise time is the time it takes a pulse to go from ________.

A the base line to the maximum HIGH voltage

B 10% of the pulse amplitude to the maximum HIGH voltage

C the base line to 90% of the pulse amplitude

D 10% of the pulse amplitude to 90% of the pulse amplitude

Q53: Convert the fractional binary number 0000.1010 to decimal.

A 0.625

B 0.50

C 0.55

D 0.10

Q54: What are the symbols used to represent digits in the binary number system?

A 0,1

B 0,1,2

C 0 through 8

D 1,2

Q55: What is one relative disadvantage of serial transfer?

A It requires too many conductors.

B Its interconnect system is complex.

C It is slow.

D It can only be used over very short distances.


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