Digital Circuits Question & Answers January 17, 2022 By WatElectronics This article lists 100 Digital Circuits MCQs for Engineering Students. All the Digital Circuits Questions & Answers given below includes solution and link wherever possible to the relevant topic. In digital circuits, the input and output will be in digital format. The circuits will have basic gates, multiplexers, counters, registers, and microprocessors. The three types of electronic circuits are digital circuits, analog circuits, and mixed-signal circuits. In integrated circuits manufacture, most of the designs that we have are digital in nature. The digital signals are stable, less prone to noise, use less power, and are not affected during data transmission. 1). Which one of the following has smaller integrated circuits? Analog electronics Digital electronics Both a and b None of the above None Hint 2). Which one of the following occupies a lesser area? Analog electronics Digital electronics Both a and b None of the above None Hint 3). The levels of integration is categorized into ______________ types? One Two Three Four None Hint 4). The combinational logic circuits and sequential circuits are type of _____________ circuits? Analog Digital Both a and b None of the above None Hint 5). In _____________ logic circuit, the output depends only on present input? Combinational Sequential Both a and b None of the above None Hint 6). _______________ gates are required to build a half adder? EX-OR AND NOR None of the above None Hint 7). Which one of the following is not a universal gate? EX-NOR NAND NOR None of the above None Hint 8). How many inputs does a full adder logic circuit will have? One Two Three Four None Hint 9). What are the advantages of a digital system over an analog system? Ease of programmability Reduction in cost of hardware High speed and reliability All of the above None Hint 10). What are the advantages of static RAM? High-speed High power consumption Low density and capacity All of the above None Hint 11). The analog to digital conversions fall into _____________ general type of technique? One Two Three Four None Hint 12). In _____________ digital circuit, the output depends on present state and present input of the circuit? Combinational Sequential Both a and b None of the above None Hint Read more about Digital Circuits 13). How many outputs do full adder logic circuits will have? One Two Three Four None Hint 14). If the two inputs are 00 then the OR gate output will be ________ High Low Moderate Constant None Hint 15). The level-sensitive (latches) are categorized into ______________ types? One Two Three Four None Hint 16). The edge-triggered (flip flops) are categorized into _______________ types? One Two Three Four None Hint 17). The sequential circuit elements are categorized into ____________ types? One Two Three Four None Hint 18). The one’s compliment of 11001011 is ________________ 00110101 0011010 00110000 00110100 None Hint 19). The two’s compliment of 11001011 is ______________ 11110101 00110101 00110000 00110100 None Hint 20). The addition of +43 and +19 results as _____________ in two’s compliment? 11110101 00110101 00110000 0111110 None Hint 21). Which one of the following complements is used for arithmetic operations? 1’s compliment 10’s compliment 2’s compliment 9’s compliment None Hint 22). Which one of the following complements is used for logical manipulations? 1’s compliment 10’s compliment 2’s compliment 9’s compliment None Hint 23). How many operations are required for one’s compliment? One Two Three Four None Hint 24). How many arithmetic operations are required for two’s complement? One Two Three Four None Hint 25). The logic circuitry is used to detect the _______________ Overflow and underflow Only overflow MSD, LSD All of the above None Hint Digital Circuit Important Questions for Interviews 26). An overflow is a ____________ problem and it occurs in ____________ position? Software, MSD Hardware, LSD Software, Middle None of the above None Hint 27). The OR operation is performed by _____________ properties in a Boolean algebra? Associative Distributive Commutative All of the above None Hint 28). Which one of the following is an expression for absorption law? A+AB=A A+B=B+A A+AB=B None of the above None Hint 29). How many cells are there in a four-variable K-map? Four Six Sixteen Twenty None Hint 30). The maximum clock frequency of advanced Schottky transistor-transistor logic (AS-TTL) is of ___________ 1MHz 10MHz 105MHz 3MHz None Hint 31). The Schottky high speed transistor-transistor logic (S-TTL) is of ___________ 1MHz 100MHz 105MHz 3MHz None Hint 32). Which one of the following TTL (Transistor-Transistor Logic) has the shortest propagation delay? AS-TTL S-TTL HS-TTL None of the above None Hint 33). What is the standard form of DLP? Dual in Long Packages Dual in Line Packages Double in Long Packages None of the above None Hint 34). What is the standard form of LCC? Long Chip Carrier Large Chip Carrier Leadless Chip Carrier None of the above None Hint 35). The fan-out and the fan-in both are characteristics of _____________ Logic families Registers Oscillators None of the above None Hint 36). What is the standard form of DTL? Diode Transistor Logic Double Transistor Logic Direct Transistor Logic None of the above None Hint 37). How many stages does diode transistor logic consists of? One Two Three Four None Hint 38). The Transistor-Transistor Logic is a _____________logic? Current sinking Voltage sinking Both a and b None of the above None Hint 39). What is the standard form of PGA? Plastic Grid Array Pen Grid Array Pin Grid Array None of the above None Hint 40). What is the standard form of ECL? Emitter Collector Logic Emitter Capacitor Logic Emitter Coupled Logic None of the above None Hint 41). What is the standard form of CML? Capacitor Mode Logic Common Mode Logic Collector Mode Logic None of the above None Hint 42). In an emitter-coupled logic the output is taken from _______________ Collector Base Emitter None of the above None Hint 43). What is the standard form of CMOS? Continuous Metal Oxide Semiconductor Complex Metal Oxide Semiconductor Complementary Metal Oxide Semiconductor None of the above None Hint 44). In an emitter-coupled logic the fan-out capacity is ___________ High Low Very low Moderate None Hint 45). What is the standard form of SCFL? Source Coupled Logic Source Common Logic Source Capacitor Logic None of the above None Hint 46). In which year does emitter-coupled logic is invented? 1956 1980 1996 2000 None Hint 47). What is the standard form of CTDL? Complimented Transistor Diode Logic Complex Transistor Diode Logic Continuous Transistor Diode Logic None of the above None Hint 48). Who invented TTL (Transistor-Transistor Logic)? Chris Brown Frank Wanlass James L.Buie None of the above None Hint 49). Who invented emitter-coupled logic (ECL)? Baker Clamp Frank Wanlass Hannon S.Yourke None of the above None Hint 50). The emitter-coupled logic circuits usually operates with _____________ voltage? High Positive Negative Both b and c None Hint Digital Circuit Quiz Questions and Answers Read more about Digital Circuits 51). What is the standard form of LVPECL? Low Voltage Positive Emitter Coupled Logic Line Voltage Positive Emitter Coupled Logic Low Voltage Positive Emitter Capacitor Logic None of the above None Hint 52). What is the standard form of IIL? Integrated Integrated Logic Injection Integrated Logic Integrated Injection Logic None of the above None Hint 53). The integrated injection logic also called as _____________ transistor logic? Merged Single Multiple None of the above None Hint 54). What is the standard form of TCTL? Transistor-Capacitor-Transistor-Logic Transistor-Coupled-Transistor-Logic Transistor-Complementary-Transistor-Logic None of the above None Hint 55). The metal oxide semiconductor is being used in _____________ integration? Small scale Large scale Very large scale Both b and c None Hint 56). What is the standard form of COS-MOS? Complementary Symmetry Metal Oxide Semiconductor Complex Symmetry Metal Oxide Semiconductor Common Symmetry Metal Oxide Semiconductor None of the above None Hint 57). The complementary metal-oxide-semiconductor technology is used in ___________ Microprocessor Digital logic Both a and b None of the above None Hint 58). The important characteristics of complementary metal-oxide-semiconductor is ___________ Has low static power consumption Has high noise immunity Both a and b None of the above None Hint 59). The programmable read-only memories are available in _______________ technologies? MOSFET FET & MOSFET MOS & Bipolar None of the above None Hint 60). What is the standard form of PSRAM? Pseudo Static Read Access Memory Pseudo Static Random Access Memory Pseudo Static Read Only Memory None of the above None Hint 61). What is the standard form of PLD? Programmable Logic Devices Pseudo Logic Devices Positive Logic Devices None of the above None Hint 62). The programmable logic devices contains large number of ____________ Gates Registers Flip-flops All of the above None Hint 63). The programmable logic devices are categorized into ____________ types? One Two Three Four None Hint 64). What is the standard form of PLA? Programmable Logic Array Programmable Local Array Programmable Load Array None of the above None Hint 65). The outputs of the AND gate in programmable logic devices is known as ______________ lines? Control b)c)d) Output Input None of the above None Hint 66). The programmable logic array is used to implement _______________ circuit? Sequential Combinational Complex combinational None of the above None Hint 67). What is the standard form of FPGA? Float Programmable Gate Array First Programmable Gate Array Field Programmable Gate Array None of the above None Hint 68). The applications of programmable logic arrays are ______________ Configurable PALs Registered PALs PAL programming All of the above None Hint 69). What is the standard form of HDL? Higher Description Language Higher Description Logic Hardware Description Language None of the above None Hint 70). What is the standard form of PAL? Programmable Array Logic Programmable Array Local Programmable Array Load None of the above None Hint 71). How many decimals does the decimal counter have? One Ten Three Five None Hint 72). How many flip-flops are required in a four-bit up-down counter? One Ten Three Four None Hint 73). What is the standard form of VHSIC? Very High Speed Integrated Circuit Very High-Speed Integrated Clock Variable High-Speed Integrated Circuit None of the above None Hint 74). What is the standard form of VHDL? Very High Definition Language Very High Description Language Verilog Hardware Definition Language None of the above None Hint 75). How many select lines are required in one to four demultiplexers? One Two Three Four None Hint Digital Circuit Interview Questions and Answers 76). How many light-emitting diodes are used in a seven-segment display? One Two Seven Four None Hint 77). The random access memory is also called as ______________ memory? MAR RWM MBR None of the above None Hint 78). Who invented one-transistor dynamic random access memory? Denard Kilby Noyce None of the above None Hint 79). Who invented a solid-state rectifier? Denard Kilby Noyce Braun None Hint Read more about Rectifiers 80). What is the standard form of EDA? Electronic Design Automation Electrical Design Automation Electronic Description Automation None of the above None Hint 81). Which one of the following is a part of electrical engineering? Analog electronics Digital electronics Power electronics None of the above None Hint 82). Which one of the following works with two-state signals? Analog electronics Digital electronics Power electronics None of the above None Hint 83). Which one of the following works with extremely low current and low voltage? Analog electronics Digital electronics Power electronics Both a and b None Hint 84). Which one of the following works with high current and high voltage? Analog electronics Digital electronics Power electronics Both a and b None Hint 85). Which one of the following electronics mainly delays with analyzing, switching, mixing, multiplexing, and process of electronic signals? Analog electronics Digital electronics Power electronics Both a and b None Hint 86). Which one of the following electronics uses only active components? Analog electronics Digital electronics Power electronics Both a and b None Hint 87). Which one of the following electronics has very low noise and distortion? Analog electronics Digital electronics Power electronics Both a and b None Hint 88). In which one of the following electronics there is no power loss? Analog electronics Digital electronics )Power electronics Both a and b None Hint 89). Which one of the following electronics helps to analyze the data of a system? Analog electronics Digital electronics Power electronics Both a and b None Hint 90). In which one of the following electronics there is no electrical safety hazard? Analog electronics Digital electronics Power electronics Both a and b None Hint 91). Which one of the following is an example of digital electronics? Digital clocks SMPS Radios None of the above None Hint 92). Which one of the following is not an example for digital electronics? Digital clocks Computers Smartphones UPS None Hint 93). Which one of the following signal stores in the form of binary bit? Analog Digital Both a and b None of the above None Hint 94). The CDs, DVDs, computers are few examples of ___________ signal? Analog Digital Both a and b None of the above None Hint 95). What is the output for the below circuit? 1 0 A A+B None Hint 96). For the below circuit the input combination should be ___________, if the output F is 1 A=1, B=1, C=1 A=1, B=0, C=0 A=0, B=0, C=1 A=0, B=0, C=0 None Hint 97). Which one of the following is a correct Boolean expression for the below circuit? M1=(P XOR Q) XOR R M1=(P OR Q) XOR R M1=(P AND Q) XOR R M1=(P NAND Q) XOR R None Hint 98). The output should be 1 if the inputs of the circuit A, B, C is equal to ______________ 0, 1, 1 1, 1, 1 0, 1, 0 0, 0, 1 None Hint 99). The below logic diagram is a 4 bit ___________________ shift register? Serial in, parallel-out Serial in, serial-out, shift right, shift left Parallel in, serial-out Parallel in, parallel-out None Hint 100). The below logic diagram is a 4 bit ___________________ shift register? Serial in, parallel-out Serial in, serial-out, shift right, shift left Parallel in, serial-out Parallel in, parallel-out None Hint Time's up
