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.
| 101. |
Temperature variation is normally an analog quantity. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 102. |
A decoder converts ________. |
| A. | noncoded information into coded form |
| B. | coded information into noncoded form |
| C. | HIGHs to LOWs |
| D. | LOWs to HIGHs |
| Answer» C. HIGHs to LOWs | |
| 103. |
In a positive logic system, the logic LOW could be between 0 V and 0.8 V. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 104. |
The frequency of a pulse train is 2 kHz. The pulse period is ________. |
| A. | 5 ms |
| B. | 50 ms |
| C. | 500 s |
| D. | 2 s |
| Answer» D. 2 s | |
| 105. |
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 |
| Answer» D. usually unnecessary | |
| 106. |
In a typical digital system, Logic 0 is 0V–0.8V, and Logic 1 is ________. |
| A. | 2–5V |
| B. | 2.5–5V |
| C. | 3.0–5.5V |
| D. | 3.5–5.5V |
| Answer» B. 2.5‚Äì5V | |
| 107. |
An ADC is an analog-to-digital converter. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 108. |
The systems shown in the given figure transfer data ________. |
| A. | serially |
| B. | sequentially |
| C. | in parallel |
| D. | both serially and sequentially |
| Answer» E. | |
| 109. |
A continually variable, proportional indicator is a(n) ________ representation. |
| A. | decimal |
| B. | digital |
| C. | unconstitutional |
| D. | analog |
| Answer» E. | |
| 110. |
Which format requires fewer conductors? |
| A. | Parallel |
| B. | Serial |
| C. | Both are the same |
| D. | Cannot tell |
| Answer» C. Both are the same | |
| 111. |
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 |
| Answer» C. when any input is HIGH | |
| 112. |
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 |
| Answer» B. 0,1,2 | |
| 113. |
The invalid range for an input to TTL logic is from ________. |
| A. | 0 to 0.8 V |
| B. | 1.2 to 1.6 V |
| C. | 0.8 to 2.0 V |
| D. | 2.0 to 5.0 V |
| Answer» D. 2.0 to 5.0 V | |
| 114. |
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 |
| Answer» C. digital data into an amplified signal | |
| 115. |
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. |
| Answer» D. It can only be used over very short distances. | |
| 116. |
An encoder converts ________. |
| A. | noncoded information into coded form |
| B. | coded information into noncoded form |
| C. | HIGHs to LOWs |
| D. | LOWs to HIGHs |
| Answer» B. coded information into noncoded form | |
| 117. |
Convert the fractional binary number 10010.0100 to decimal. |
| A. | 24.5 |
| B. | 18.25 |
| C. | 18.4 |
| D. | 16.25 |
| Answer» C. 18.4 | |
| 118. |
Telecommunications systems do not use digital techniques. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 119. |
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 |
| Answer» C. 666.66 Hz | |
| 120. |
Which of the following is a semiconductor memory? |
| A. | RAM |
| B. | MAR |
| C. | CD-ROM |
| D. | CD |
| Answer» B. MAR | |
| 121. |
Memory devices store binary data. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 122. |
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 |
| Answer» B. the input is HIGH | |
| 123. |
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 |
| Answer» C. LSI | |
| 124. |
Which of the following is not an analog device? |
| A. | Thermocouple |
| B. | Current flow in a circuit |
| C. | Light switch |
| D. | Audio microphone |
| Answer» D. Audio microphone | |
| 125. |
What kind of logic device or circuit is used to store information? |
| A. | Counter |
| B. | Register |
| C. | Inverter |
| D. | Buffer |
| Answer» C. Inverter | |
| 126. |
Which format can send several bits of information faster? |
| A. | Parallel |
| B. | Serial |
| C. | Both are the same |
| D. | Cannot tell |
| Answer» B. Serial | |
| 127. |
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 |
| Answer» E. | |
| 128. |
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. |
| Answer» B. several digital signals are sent on each conductor. | |
| 129. |
The voltage levels used to represent binary values (0 and 1) in a digital system are nearly equal in value. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 130. |
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 |
| Answer» E. | |
| 131. |
The range of voltages between VL(max) and VH(min) are ________. |
| A. | unknown |
| B. | unnecessary |
| C. | unacceptable |
| D. | between 2 V and 5 V |
| Answer» D. between 2 V and 5 V | |
| 132. |
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. |
| Answer» B. It allows the use of cheaper analog techniques, which are always simpler. | |
| 133. |
Convert the fractional decimal number 6.75 to binary. |
| A. | 111.11 |
| B. | 110.101 |
| C. | 110.11 |
| D. | 110.011 |
| Answer» D. 110.011 | |
| 134. |
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. |
| Answer» B. The circuits are less affected by noise. | |
| 135. |
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 |
| Answer» B. a LOW = 1, a HIGH = 0 | |
| 136. |
The generic array logic (GAL) device is ________. |
| A. | one-time programmable |
| B. | reprogrammable |
| C. | a CMOS device |
| D. | reprogrammable and a CMOS device |
| Answer» C. a CMOS device | |
| 137. |
How many binary bits are necessary to represent 748 different numbers? |
| A. | 9 |
| B. | 7 |
| C. | 10 |
| D. | 8 |
| Answer» D. 8 | |
| 138. |
Digital systems have ________. |
| A. | one state |
| B. | two states |
| C. | three states |
| D. | four states |
| Answer» C. three states | |
| 139. |
Any number with an exponent of zero is equal to: |
| A. | zero |
| B. | one |
| C. | that number |
| D. | ten |
| Answer» C. that number | |