Digital Concepts C. unacceptable 10. Give the decimal value of binary 10010.
1. Any number with an exponent of zero is equal D. between 2 V and 5 V A. 6base10 B. 9base10
to:
6. What is a digital-to-analog converter? C. 18base10 D. 20base10
A. zero B. one
A. It takes the digital information from an audio CD 11. Parallel format means that:
C. that number D. ten and converts it to a usable form.
A. each digital signal has its own conductor.
2. In the decimal numbering system, what is the B. It allows the use of cheaper analog techniques,
B. several digital signals are sent on each
MSD? which are always simpler.
conductor.
A. The middle digit of a stream of numbers C. It stores digital data on a hard drive.
C. both binary and hexadecimal can be used.
B. The digit to the right of the decimal point D. It converts direct current to alternating current.
D. no clock is needed.
C. The last digit on the right A DAC converts an abstract finite-precision
12. A decoder converts ________.
number (usually a fixed-point binary number) into
D. The digit with the most weight
a concrete physical quantity (e.g., a voltage or a A. noncoded information into coded form
3. Which of the following statements does NOT pressure).
B. coded information into noncoded form
describe an advantage of digital technology?
7. What are the symbols used to represent digits in
the binary number system? C. HIGHs to LOWs
A. The values may vary over a continuous range.
A. 0,1 B. 0,1,2 D. LOWs to HIGHs
B. The circuits are less affected by noise.
C. 0 through 8 D. 1,2 13. A DAC changes ________.
C. The operation can be programmed.
8. A full subtracter circuit requires ________. A. an analog signal into digital data
D. Information storage is easy.
A. two inputs and two outputs B. digital data into an analog signal
4. The generic array logic (GAL) device is ________.
B. two inputs and three outputs C. digital data into an amplified signal
A. one-time programmable
C. three inputs and one output D. none of the above
B. reprogrammable
D. three inputs and two outputs 14. The output of a NOT gate is HIGH when
C. a CMOS device
________.
D. reprogrammable and a CMOS device 9. The output of an AND gate is LOW ________.
A. the input is LOW
5. The range of voltages between VL(max) and VH(min) A. all the time
B. the input is HIGH
are ________.
B. when any input is LOW
C. the input changes from LOW to HIGH
A. unknown
C. when any input is HIGH
D. voltage is removed from the gate
B. unnecessary
D. when all inputs are HIGH
, 15. The output of an OR gate is LOW when 21. In positive logic, ________. B. requires only one signal line between sender and
________. receiver.
A. a HIGH = 1, a LOW = 0
A. all inputs are LOW B. any input is LOW C. requires as many signal lines between sender
B. a LOW = 1, a HIGH = 0
and receiver as there are data bits.
C. any input is HIGH D. all inputs are HIGH
C. only HIGHs are present
D. is less expensive than the serial method of data
16. Which of the following is not an analog device?
D. only LOWs are present transmission.
A. Thermocouple
22. Convert the fractional binary number 26. Convert the fractional decimal number 6.75 to
B. Current flow in a circuit 0000.1010 to decimal. binary.
C. Light switch A. 0.625 B. 0.50 A. 0111.1100 B. 0110.1010
D. Audio microphone C. 0.55 D. 0.10 C. 0110.1100 D. 0110.0110
17. A demultiplexer has ________. 23. Digital representations of numerical values of 27. What is one relative disadvantage of serial
quantities may BEST be described as having transfer?
A. one data input and a number of selection inputs,
characteristics:
and they have several outputs A. It requires too many conductors.
A. that are difficult to interpret because they are
B. one input and one output B. Its interconnect system is complex.
continuously changing.
C. several inputs and several outputs C. It is slow.
B. that vary constantly over a continuous range of
D. several inputs and one output values. D. It can only be used over very short distances.
18. A flip-flop has ________. C. that vary in constant and direct proportion to the 28. Which format requires fewer conductors?
values they represent.
A. one stable state B. no stable states A. Parallel B. Serial
D. that vary in discrete steps in proportion to the
C. two stable states D. none of the above C. Both are the same D. Cannot tell
values they represent.
19. Digital signals transmitted on a single 29. A pulse has a period of 15 ms. Its frequency is
24. A common instrument used in troubleshooting
conductor (and a ground) must be transmitted in: ________.
a digital circuit is a(n) ________.
A. slow speed. B. parallel. A. 6.66 Hz B. 66.66 Hz
A. logic probe B. oscilloscope
C. analog. D. serial. C. 666.66 Hz D. 15 Hz
C. pulser D. all of the above
20. In a certain digital waveform, the period is four 30. Give the decimal value of binary 10000110.
25. The parallel transmission of digital data:
times the pulse width. The duty cycle is ________.
A. 134base10 B. 144base10
A. is much slower than the serial transmission of
A. 0% B. 25% data. C. 110base10 D. 126base10
C. 50% D. 100%
1. Any number with an exponent of zero is equal D. between 2 V and 5 V A. 6base10 B. 9base10
to:
6. What is a digital-to-analog converter? C. 18base10 D. 20base10
A. zero B. one
A. It takes the digital information from an audio CD 11. Parallel format means that:
C. that number D. ten and converts it to a usable form.
A. each digital signal has its own conductor.
2. In the decimal numbering system, what is the B. It allows the use of cheaper analog techniques,
B. several digital signals are sent on each
MSD? which are always simpler.
conductor.
A. The middle digit of a stream of numbers C. It stores digital data on a hard drive.
C. both binary and hexadecimal can be used.
B. The digit to the right of the decimal point D. It converts direct current to alternating current.
D. no clock is needed.
C. The last digit on the right A DAC converts an abstract finite-precision
12. A decoder converts ________.
number (usually a fixed-point binary number) into
D. The digit with the most weight
a concrete physical quantity (e.g., a voltage or a A. noncoded information into coded form
3. Which of the following statements does NOT pressure).
B. coded information into noncoded form
describe an advantage of digital technology?
7. What are the symbols used to represent digits in
the binary number system? C. HIGHs to LOWs
A. The values may vary over a continuous range.
A. 0,1 B. 0,1,2 D. LOWs to HIGHs
B. The circuits are less affected by noise.
C. 0 through 8 D. 1,2 13. A DAC changes ________.
C. The operation can be programmed.
8. A full subtracter circuit requires ________. A. an analog signal into digital data
D. Information storage is easy.
A. two inputs and two outputs B. digital data into an analog signal
4. The generic array logic (GAL) device is ________.
B. two inputs and three outputs C. digital data into an amplified signal
A. one-time programmable
C. three inputs and one output D. none of the above
B. reprogrammable
D. three inputs and two outputs 14. The output of a NOT gate is HIGH when
C. a CMOS device
________.
D. reprogrammable and a CMOS device 9. The output of an AND gate is LOW ________.
A. the input is LOW
5. The range of voltages between VL(max) and VH(min) A. all the time
B. the input is HIGH
are ________.
B. when any input is LOW
C. the input changes from LOW to HIGH
A. unknown
C. when any input is HIGH
D. voltage is removed from the gate
B. unnecessary
D. when all inputs are HIGH
, 15. The output of an OR gate is LOW when 21. In positive logic, ________. B. requires only one signal line between sender and
________. receiver.
A. a HIGH = 1, a LOW = 0
A. all inputs are LOW B. any input is LOW C. requires as many signal lines between sender
B. a LOW = 1, a HIGH = 0
and receiver as there are data bits.
C. any input is HIGH D. all inputs are HIGH
C. only HIGHs are present
D. is less expensive than the serial method of data
16. Which of the following is not an analog device?
D. only LOWs are present transmission.
A. Thermocouple
22. Convert the fractional binary number 26. Convert the fractional decimal number 6.75 to
B. Current flow in a circuit 0000.1010 to decimal. binary.
C. Light switch A. 0.625 B. 0.50 A. 0111.1100 B. 0110.1010
D. Audio microphone C. 0.55 D. 0.10 C. 0110.1100 D. 0110.0110
17. A demultiplexer has ________. 23. Digital representations of numerical values of 27. What is one relative disadvantage of serial
quantities may BEST be described as having transfer?
A. one data input and a number of selection inputs,
characteristics:
and they have several outputs A. It requires too many conductors.
A. that are difficult to interpret because they are
B. one input and one output B. Its interconnect system is complex.
continuously changing.
C. several inputs and several outputs C. It is slow.
B. that vary constantly over a continuous range of
D. several inputs and one output values. D. It can only be used over very short distances.
18. A flip-flop has ________. C. that vary in constant and direct proportion to the 28. Which format requires fewer conductors?
values they represent.
A. one stable state B. no stable states A. Parallel B. Serial
D. that vary in discrete steps in proportion to the
C. two stable states D. none of the above C. Both are the same D. Cannot tell
values they represent.
19. Digital signals transmitted on a single 29. A pulse has a period of 15 ms. Its frequency is
24. A common instrument used in troubleshooting
conductor (and a ground) must be transmitted in: ________.
a digital circuit is a(n) ________.
A. slow speed. B. parallel. A. 6.66 Hz B. 66.66 Hz
A. logic probe B. oscilloscope
C. analog. D. serial. C. 666.66 Hz D. 15 Hz
C. pulser D. all of the above
20. In a certain digital waveform, the period is four 30. Give the decimal value of binary 10000110.
25. The parallel transmission of digital data:
times the pulse width. The duty cycle is ________.
A. 134base10 B. 144base10
A. is much slower than the serial transmission of
A. 0% B. 25% data. C. 110base10 D. 126base10
C. 50% D. 100%
