MCQOPTIONS
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MCQOPTIONS
This section includes 139 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Digital circuits cannot perform logic comparisons since the circuit can have only one of two values at any instant. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 52. |
A microcomputer is not a general-purpose computer. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 53. |
Parallel transmission is faster than serial. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 54. |
The systems shown in the given figure communicate using ________. |
| A. | parallel data |
| B. | serial data |
| C. | serial-parallel data |
| D. | both parallel and serial data |
| Answer» B. serial data | |
| 55. |
The given figure is most likely a ________. |
| A. | register |
| B. | decoder |
| C. | counter |
| D. | multiplexer |
| Answer» B. decoder | |
| 56. |
With an AND gate, if one input is HIGH, the output reflects the other input. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 57. |
An invalid digital signal is used as a zero. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 58. |
Once a signal is digitized, the information it contains does not ________ as it is processed. |
| A. | complain |
| B. | stiffen |
| C. | compress |
| D. | deteriorate |
| Answer» E. | |
| 59. |
A logic analyzer is used to display a timing diagram. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 60. |
The two binary digits are 1 and 2. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 61. |
A microcontroller would not be used in a(n) ________. |
| A. | VCR |
| B. | automobile ignition system |
| C. | antilock brakes |
| D. | grandfather clock |
| Answer» E. | |
| 62. |
The quantity represented by #1 in the given figure is ________. |
| A. | VH(max) |
| B. | VL(min) |
| C. | VH(min) |
| D. | VL(max) |
| Answer» E. | |
| 63. |
In a serial data system, the data is transmitted along a group of conductors simultaneously. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 64. |
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 |
| Answer» D. 0.7‚Äì2.5 volts | |
| 65. |
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 |
| Answer» D. VLSI | |
| 66. |
How many unique symbols are used in the decimal number system? |
| A. | One |
| B. | Nine |
| C. | Ten |
| D. | Unlimited |
| Answer» D. Unlimited | |
| 67. |
A common instrument used in troubleshooting a digital circuit is a(n) ________. |
| A. | logic probe |
| B. | oscilloscope |
| C. | pulser |
| D. | all of the above |
| Answer» E. | |
| 68. |
What is the decimal value of 23 ? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |
| 69. |
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 |
| Answer» B. one input and one output | |
| 70. |
Convert the fractional binary number 0000.1010 to decimal. |
| A. | 0.625 |
| B. | 0.5 |
| C. | 0.55 |
| D. | 0.1 |
| Answer» B. 0.5 | |
| 71. |
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. |
| Answer» E. | |
| 72. |
SMT stands for small-to-medium technology. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 73. |
A flip-flop has ________. |
| A. | one stable state |
| B. | no stable states |
| C. | two stable states |
| D. | none of the above |
| Answer» D. none of the above | |
| 74. |
Give the decimal value of binary 10000110. |
| A. | 13410 |
| B. | 14410 |
| C. | 11010 |
| D. | 12610 |
| Answer» B. 14410 | |
| 75. |
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. |
| Answer» D. is less expensive than the serial method of data transmission. | |
| 76. |
A device to convert a binary number to a 7-segment display format is a decoder. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 77. |
In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________. |
| A. | 0 |
| B. | 0.25 |
| C. | 0.5 |
| D. | 1 |
| Answer» C. 0.5 | |
| 78. |
1/4 as a binary number would be ________. |
| A. | 0.01 |
| B. | 0.11 |
| C. | 0.1 |
| D. | 0 |
| Answer» B. 0.11 | |
| 79. |
The manner in which a digital circuit responds to an input is the circuit's ________. |
| A. | logic |
| B. | wiring |
| C. | inputs |
| D. | outputs |
| Answer» B. wiring | |
| 80. |
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. |
| Answer» C. sent in groups of eight signals. | |
| 81. |
In a negative logic system, the area represented by #3 in the given figure would be the ________ level. |
| A. | HIGH |
| B. | LOW |
| C. | off |
| D. | uncertain |
| Answer» B. LOW | |
| 82. |
Any number with an exponent of one is equal to: |
| A. | zero. |
| B. | one. |
| C. | two. |
| D. | that number. |
| Answer» E. | |
| 83. |
PLCC packages have leads on ________. |
| A. | one side |
| B. | two sides |
| C. | three sides |
| D. | four sides |
| Answer» E. | |
| 84. |
What is the decimal value of 2–1 ? |
| A. | 0.5 |
| B. | 0.25 |
| C. | 0.05 |
| D. | 0.1 |
| Answer» B. 0.25 | |
| 85. |
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 |
| Answer» E. | |
| 86. |
Convert the fractional binary number 0001.0010 to decimal. |
| A. | 1.4 |
| B. | 1.125 |
| C. | 1.2 |
| D. | 1.8 |
| Answer» C. 1.2 | |
| 87. |
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. |
| Answer» C. It allows the use of digital signals in everyday life. | |
| 88. |
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 |
| Answer» E. | |
| 89. |
Give the decimal value of binary 10010. |
| A. | 610 |
| B. | 910 |
| C. | 1810 |
| D. | 2010 |
| Answer» D. 2010 | |
| 90. |
A digital circuit will not obey a set of logic rules. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 91. |
A periodic digital waveform has a pulse width (tw) of 6 ms and a period (T) of 18 ms. The duty cycle is ________. |
| A. | 0.033 |
| B. | 0.333 |
| C. | 0.06 |
| D. | 0.18 |
| Answer» C. 0.06 | |
| 92. |
The combination of waveforms consisting of the given figures 1 and 2 is generally referred to as ________. |
| A. | simultaneous waveforms |
| B. | a timing diagram |
| C. | two-phase waveforms |
| D. | pulse waveforms |
| Answer» C. two-phase waveforms | |
| 93. |
Digital systems are called ________. |
| A. | binary systems |
| B. | logic systems |
| C. | numbering systems |
| D. | ADC systems |
| Answer» C. numbering systems | |
| 94. |
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 |
| Answer» E. | |
| 95. |
Digital signals transmitted on a single conductor (and a ground) must be transmitted in: |
| A. | slow speed. |
| B. | parallel. |
| C. | analog. |
| D. | serial. |
| Answer» E. | |
| 96. |
The set of instructions for a computer is called a(n) ________. |
| A. | program |
| B. | input |
| C. | output |
| D. | control unit |
| Answer» B. input | |
| 97. |
A digital quantity has a discrete set of values. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 98. |
Transistor-transistor logic (TTL) uses the bipolar transistor as its main circuit element. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 99. |
A type of digital circuit technology that uses bipolar junction transistors is ________. |
| A. | TTL |
| B. | CMOS |
| C. | LSI |
| D. | NMOS |
| Answer» B. CMOS | |
| 100. |
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 |
| Answer» B. any input is LOW | |