MCQOPTIONS
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MCQOPTIONS
This section includes 2291 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The family of logic that is composed of bipolar junction transistors is ____. |
| A. | TTL |
| B. | CMOS |
| C. | DIP |
| D. | BJT |
| Answer» B. CMOS | |
| 102. |
What can a relay provide between the triggering source and the output that semiconductor switching devices cannot? |
| A. | total isolation |
| B. | faster |
| C. | higher current rating |
| D. | total isolation and higher current rating |
| Answer» E. | |
| 103. |
Why is parallel data transmission preferred over serial data transmission for most applications? |
| A. | It is much slower. |
| B. | It is cheaper. |
| C. | More people use it. |
| D. | It is much faster. |
| Answer» E. | |
| 104. |
Which device(s) have almost ideal ON and OFF resistances? |
| A. | electromechanical relays |
| B. | manual switches |
| C. | semiconductor devices (diodes and transistors) |
| D. | electromechanical relays and manual switches |
| Answer» E. | |
| 105. |
A diode placed in parallel across a relay coil serves what function? |
| A. | to regulate input voltage |
| B. | to protect the coil from arcing |
| C. | to ensure most of the current passes through the coil |
| D. | to reduce arcing across the relay contacts |
| Answer» C. to ensure most of the current passes through the coil | |
| 106. |
What is the output voltage from the circuit in the given figure? |
| A. | +15 V |
| B. | +12 V |
| C. | +3 V |
| D. | 0 V |
| Answer» E. | |
| 107. |
The following waveform pattern is for a(n) ________. |
| A. | 2-input AND gate |
| B. | 2-input OR gate |
| C. | Exclusive-OR gate |
| D. | None of the above |
| Answer» C. Exclusive-OR gate | |
| 108. |
Implementing the expression with NOR logic, we get: |
| A. | (A) |
| B. | (B) |
| C. | (C) |
| D. | (D) |
| Answer» B. (B) | |
| 109. |
A 4-variable AND-OR-Invert circuit produces a 0 at its Y output. Which combination of inputs is correct? |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0040a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0040b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0040c.gif"> |
| D. | none of the above |
| Answer» D. none of the above | |
| 110. |
To implement the expression , it takes one OR gate and ________. |
| A. | three AND gates and three inverters |
| B. | three AND gates and four inverters |
| C. | three AND gates |
| D. | one AND gate |
| Answer» B. three AND gates and four inverters | |
| 111. |
Internally, a computer's binary data are almost always transmitted on parallel channels, commonly referred to as the: |
| A. | parallel bus |
| B. | serial bus |
| C. | data bus |
| D. | memory bus |
| Answer» D. memory bus | |
| 112. |
Why does the TTL family use a totem-pole circuit on the output? |
| A. | It provides active pull-up. |
| B. | It provides active pull-down. |
| C. | It provides active pull-up and active pull-down. |
| Answer» D. | |
| 113. |
What is the frequency of a clock waveform if the period of that waveform is1.25 s? |
| A. | 8 kHz |
| B. | 0.8 kHz |
| C. | 0.8 MHz |
| D. | 8 MHz |
| Answer» D. 8 MHz | |
| 114. |
Why is the given circuit called an inverter? |
| A. | The output is the opposite (inverse) of the input. |
| B. | The output is in phase with the input. |
| C. | The output is the same as the input. |
| D. | There is no output. |
| Answer» B. The output is in phase with the input. | |
| 115. |
The output of an exclusive-NOR gate is 1. Which input combination is correct? |
| A. | A = 1, B = 0 |
| B. | A = 0, B = 1 |
| C. | A = 0, B = 0 |
| D. | none of the above |
| Answer» D. none of the above | |
| 116. |
Is the transistor in the given figure considered ON or OFF? |
| A. | OFF |
| B. | ON |
| C. | Not enough information is provided. |
| Answer» B. ON | |
| 117. |
Implementation of the Boolean expression results in ________. |
| A. | three AND gates, one OR gate |
| B. | three AND gates, one NOT gate, one OR gate |
| C. | three AND gates, one NOT gate, three OR gates |
| D. | three AND gates, three OR gates |
| Answer» C. three AND gates, one NOT gate, three OR gates | |
| 118. |
One possible output expression for an AND-OR-Invert circuit having one AND gate with inputs A, B, and C and one AND gate with inputs D and E is ________. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0190a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0190b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0190c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0190d.gif"> |
| Answer» D. <img src="/_files/images/digital-electronics/digital-fundamentals/mca5_0190d.gif"> | |
| 119. |
A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct? |
| A. | A = 0, B = 0, C = 1, D = 1 |
| B. | A = 1, B = 1, C = 0, D = 0 |
| C. | A = 1, B = 1, C = 1, D = 1 |
| D. | A = 1, B = 0, C = 1, D = 0 |
| Answer» E. | |
| 120. |
The abbreviation NO, when used with respect to electromechanical relays, stands for not operational. |
| A. | True |
| B. | False |
| Answer» C. | |
| 121. |
The units for the HIGH time for a periodic wave are ________. |
| A. | seconds |
| B. | hertz |
| C. | cycles |
| D. | % |
| Answer» B. hertz | |
| 122. |
What is the advantage of using serial data transmission over parallel data transmission? |
| A. | It is slower. |
| B. | Only one pair of wires is required. |
| C. | More people use it. |
| D. | It is faster. |
| Answer» C. More people use it. | |
| 123. |
Normal operation of an NPN bipolar transistor requires the base to be ________ with respect to the emitter, and ________ with respect to the collector. |
| A. | positive, negative |
| B. | positive, positive |
| C. | negative, positive |
| D. | negative, negative |
| Answer» B. positive, positive | |
| 124. |
A logic circuit with an output consists of ________. |
| A. | two AND gates, two OR gates, two inverters |
| B. | three AND gates, two OR gates, one inverter |
| C. | two AND gates, one OR gate, two inverters |
| D. | two AND gates, one OR gate |
| Answer» D. two AND gates, one OR gate | |
| 125. |
Implementing the expression using NAND logic, we get: |
| A. | (A) |
| B. | (B) |
| C. | (C) |
| D. | (D) |
| Answer» E. | |
| 126. |
Implementing the expression using NAND logic, we get: |
| A. | (A) |
| B. | (B) |
| C. | (C) |
| D. | (D) |
| Answer» C. (C) | |
| 127. |
What is the advantage of using CMOS logic over TTL? |
| A. | It switches faster. |
| B. | It uses less power. |
| C. | It is larger. |
| D. | cost |
| Answer» C. It is larger. | |
| 128. |
What is used to graphically show the time relationship between two or more digital waveforms? |
| A. | reference diagram |
| B. | timing diagram |
| C. | voltage curve |
| D. | load line |
| Answer» C. voltage curve | |
| 129. |
The period of a waveform is the percentage of time the signal is HIGH. |
| A. | True |
| B. | False |
| Answer» C. | |
| 130. |
Any number with an exponent of zero is equal to: |
| A. | zero |
| B. | one |
| C. | that number |
| D. | ten |
| Answer» C. that number | |
| 131. |
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. | |
| 132. |
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 | |
| 133. |
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 | |
| 134. |
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 | |
| 135. |
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 | |
| 136. |
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. | |
| 137. |
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 | |
| 138. |
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% |
| Answer» C. 6% | |
| 139. |
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. | |
| 140. |
Any number with an exponent of one is equal to: |
| A. | zero. |
| B. | one. |
| C. | two. |
| D. | that number. |
| Answer» E. | |
| 141. |
Which of the following is a semiconductor memory? |
| A. | RAM |
| B. | MAR |
| C. | CD-ROM |
| D. | CD |
| Answer» B. MAR | |
| 142. |
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 | |
| 143. |
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 | |
| 144. |
What is the decimal value of 2 1 ? |
| A. | 0.5 |
| B. | 0.25 |
| C. | 0.05 |
| D. | 0.1 |
| Answer» B. 0.25 | |
| 145. |
How many unique symbols are used in the decimal number system? |
| A. | One |
| B. | Nine |
| C. | Ten |
| D. | Unlimited |
| Answer» D. Unlimited | |
| 146. |
What kind of logic device or circuit is used to store information? |
| A. | Counter |
| B. | Register |
| C. | Inverter |
| D. | Buffer |
| Answer» C. Inverter | |
| 147. |
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. | |
| 148. |
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 2.5 volts | |
| 149. |
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. | |
| 150. |
PLCC packages have leads on ________. |
| A. | one side |
| B. | two sides |
| C. | three sides |
| D. | four sides |
| Answer» E. | |