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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?
HintThe integrated circuits are not smaller in analog electronics compared to digital electronics
2). Which one of the following occupies a lesser area?
HintDigital electronics occupies lesser area compare to analog electronics
3). The levels of integration is categorized into ______________ types?
HintThe levels of integration are categorized into four types they are SSI, LSI, VLSI, and MSI
4). The combinational logic circuits and sequential circuits are type of _____________ circuits?
HintThe combinational logic circuits and sequential circuits are a type of digital circuits
5). In _____________ logic circuit, the output depends only on present input?
HintIn the combinational logic circuit, the output depends only on the present input
6). _______________ gates are required to build a half adder?
HintThe EX-OR gates are required to build a half adder
7). Which one of the following is not a universal gate?
HintThe EX-NOR is not a universal gate
8). How many inputs does a full adder logic circuit will have?
HintThe full adder logic circuits will have three inputs
9). What are the advantages of a digital system over an analog system?
HintThe advantages of a digital system over the analog system are ease of programmability, reduction in the cost of hardware, high speed and reliability
10). What are the advantages of static RAM?
HintThe advantages of static RAM are high speed, high power consumption, low density, and capacity
11). The analog to digital conversions fall into _____________ general type of technique?
HintThe analog to digital conversions fall into three general types of technique they are parallel encoding, successive approx., and single or double slope
12). In _____________ digital circuit, the output depends on present state and present input of the circuit?
Hint­- In a sequential digital circuit, the output depends on the present state and present input of the circuit
Read more about Digital Circuits
13). How many outputs do full adder logic circuits will have?
HintThe full adder logic circuits will have two outputs
14). If the two inputs are 00 then the OR gate output will be ________
HintIf the two inputs are 00 then the OR gate output will be high
15). The level-sensitive (latches) are categorized into ______________ types?
HintThe level-sensitive (latches) are categorized into two types they are high level sensitive and low level sensitive
16). The edge-triggered (flip flops) are categorized into _______________ types?
HintThe edge-triggered (flip flops) are categorized into two types they are rising edge-triggered and falling edge triggered
17). The sequential circuit elements are categorized into ____________ types?
HintThe sequential circuit elements are categorized into two types they are level sensitive and edge triggered
18). The one’s compliment of 11001011 is ________________
HintThe one’s compliment of 11001011 is 00110101
19). The two’s compliment of 11001011 is ______________
HintThe two’s compliment of 11001011 is 00110101
20). The addition of +43 and +19 results as _____________ in two’s compliment?
HintThe addition of +43 and +19 results as 0111110 in two’s compliment
21). Which one of the following complements is used for arithmetic operations?
HintFor arithmetic operations, only two’s complement is used
22). Which one of the following complements is used for logical manipulations?
HintThe one’s complement is used for logical manipulations
23). How many operations are required for one’s compliment?
HintOnly one operation is required for one’s compliment
24). How many arithmetic operations are required for two’s complement?
HintThe arithmetic operations are required for two’s complement is one
25). The logic circuitry is used to detect the _______________
HintThe logic circuitry is used to detect only overflow

Digital Circuit Important Questions for Interviews

26). An overflow is a ____________ problem and it occurs in ____________ position?
HintAn overflow is a software problem and it occurs in the MSD position
27). The OR operation is performed by _____________ properties in a Boolean algebra?
HintThe OR operation is performed by associative, distributive, and commutative properties in a boolean algebra
28). Which one of the following is an expression for absorption law?
HintThe A+AB=A is an expression for absorption law
29). How many cells are there in a four-variable K-map?
HintIn a four-variable k-map there are sixteen cells
30). The maximum clock frequency of advanced Schottky transistor-transistor logic (AS-TTL) is of ___________
HintThe maximum clock frequency of advanced Schottky transistor-transistor logic (AS-TTL) is of 105MHz
31). The Schottky high speed transistor-transistor logic (S-TTL) is of ___________
HintThe Schottky high-speed transistor-transistor logic (S-TTL) is of 100MHz
32). Which one of the following TTL (Transistor-Transistor Logic) has the shortest propagation delay?
HintThe advanced Schottky TTL (Transistor-Transistor Logic) has the shortest propagation delay
33). What is the standard form of DLP?
HintThe standard form of DLP is Dual in Line Packages
34). What is the standard form of LCC?
HintThe standard form of LLC is Leadless Chip Carrier
35). The fan-out and the fan-in both are characteristics of _____________
HintThe fan-out and the fan-in both are characteristics of logical families
36). What is the standard form of DTL?
HintThe standard form of DTL is Diode Transistor Logic
37). How many stages does diode transistor logic consists of?
HintThe diode transistor logic consists of three stages they are an output diode logic, an input diode logic, and an intermediate logic
38). The Transistor-Transistor Logic is a _____________logic?
HintThe Transistor-Transistor Logic is a current-sinking logic
39). What is the standard form of PGA?
HintThe standard form of PGA is Pin Grid Array
40). What is the standard form of ECL?
HintThe standard form of ECL is Emitter Coupled Logic
41). What is the standard form of CML?
HintThe standard form of CML is Collector Mode Logic
42). In an emitter-coupled logic the output is taken from _______________
HintIn an emitter-coupled logic the output is taken from the collector
43). What is the standard form of CMOS?
HintThe standard form of CMOS is Complementary Metal Oxide Semiconductor
44). In an emitter-coupled logic the fan-out capacity is ___________
HintIn an emitter-coupled logic the fan-out capacity is high
45). What is the standard form of SCFL?
HintThe standard form of SCFL is Source Coupled Logic
46). In which year does emitter-coupled logic is invented?
HintIn 1956 the emitter-coupled logic is invented
47). What is the standard form of CTDL?
HintThe standard form of CTDL is Complimented Transistor Diode Logic
48). Who invented TTL (Transistor-Transistor Logic)?
HintThe Transistor-Transistor Logic is invented by James L.Buie
49). Who invented emitter-coupled logic (ECL)?
HintThe Hannon S.Yourke invented emitter-coupled logic (ECL)
50). The emitter-coupled logic circuits usually operates with _____________ voltage?
HintThe emitter-coupled logic circuits usually operates with positive voltage

Digital Circuit Quiz Questions and Answers

Read more about Digital Circuits
51). What is the standard form of LVPECL?
HintThe standard form of LVPECL is Low Voltage Positive Emitter Coupled Logic
52). What is the standard form of IIL?
HintThe standard form of IIL is Integrated Injection Logic
53). The integrated injection logic also called as _____________ transistor logic?
HintThe integrated injection logic also called merged transistor logic
54). What is the standard form of TCTL?
HintThe standard form of TCTL is Transistor-Coupled-Transistor-Logic
55). The metal oxide semiconductor is being used in _____________ integration?
HintThe metal oxide semiconductor is being used in large scale and very large scale integration
56). What is the standard form of COS-MOS?
HintThe standard form of COS-MOS is Complementary Symmetry Metal Oxide Semiconductor
57). The complementary metal-oxide-semiconductor technology is used in ___________
HintThe complementary metal-oxide-semiconductor technology is used in microprocessors as well as in digital logic
58). The important characteristics of complementary metal-oxide-semiconductor is ___________
HintThe important characteristics of the complementary metal-oxide-semiconductor are it has low static power consumption and high noise immunity
59). The programmable read-only memories are available in _______________ technologies?
HintThe programmable read-only memories are available in MOS and bipolar technologies
60). What is the standard form of PSRAM?
HintThe standard form of PSRAM is Pseudo Static Random Access Memory
61). What is the standard form of PLD?
HintThe standard form of PLD is Programmable Logic Devices
62). The programmable logic devices contains large number of ____________
HintThe programmable logic devices contain a large number of gates, registers, and flip flops
63). The programmable logic devices are categorized into ____________ types?
HintThe programmable logic devices are categorized into three types they are PROM, PAL, and PLA
64). What is the standard form of PLA?
HintThe standard form of PLA is Programmable Logic Array
65). The outputs of the AND gate in programmable logic devices is known as ______________ lines?
HintThe outputs of the AND gate in programmable logic devices are known as control lines
66). The programmable logic array is used to implement _______________ circuit?
HintThe programmable logic array is used to implement complex combinational circuit
67). What is the standard form of FPGA?
HintThe standard form of FPGA is Field Programmable Gate Array
68). The applications of programmable logic arrays are ______________
HintThe applications of programmable logic arrays are configurable PALs, registered PALs, and PAL programming
69). What is the standard form of HDL?
HintThe standard form of HDL is Higher Description Language
70). What is the standard form of PAL?
HintThe standard form of PAL is Programmable Array Logic
71). How many decimals does the decimal counter have?
HintThe decimal counter have ten decimals
72). How many flip-flops are required in a four-bit up-down counter?
HintThe four flip-flops are required in four-bit up-down counter
73). What is the standard form of VHSIC?
HintThe standard form of VHSIC is Very High-Speed Integrated Circuit
74). What is the standard form of VHDL?
HintThe standard form of VHDL is Verilog Hardware Definition Language
75). How many select lines are required in one to four demultiplexers?
HintThe two select lines are required in one to four demultiplexer

Digital Circuit Interview Questions and Answers

76). How many light-emitting diodes are used in a seven-segment display?
HintThe seven light-emitting diodes are used in seven-segment display
77). The random access memory is also called as ______________ memory?
HintThe random access memory is also called read-write memory
78). Who invented one-transistor dynamic random access memory?
HintThe Denard invented one-transistor dynamic random access memory
79). Who invented a solid-state rectifier?
HintThe Braun invented solid-state rectifier in 1874
Read more about Rectifiers
80). What is the standard form of EDA?
HintThe standard form of EDA is Electronic Design Automation
81). Which one of the following is a part of electrical engineering?
HintThe power electronics is a part of electrical engineering
82). Which one of the following works with two-state signals?
HintThe digital electronics work with two state signal
83). Which one of the following works with extremely low current and low voltage?
HintThe digital electronics work with extremely low current and low voltage
84). Which one of the following works with high current and high voltage?
HintThe power electronics work with high current and high voltage
85). Which one of the following electronics mainly delays with analyzing, switching, mixing, multiplexing, and process of electronic signals?
HintThe digital electronics mainly delays with analyzing, switching, mixing, multiplexing, and process of electronic signals
86). Which one of the following electronics uses only active components?
HintThe digital electronics use only active components
87). Which one of the following electronics has very low noise and distortion?
HintThe digital electronics have very low noise and distortion
88). In which one of the following electronics there is no power loss?
HintIn digital electronics there is no power loss
89). Which one of the following electronics helps to analyze the data of a system?
HintThe digital electronics helps to analyze the data of a system
90). In which one of the following electronics there is no electrical safety hazard?
HintIn digital electronics there is no electrical safety hazard
91). Which one of the following is an example of digital electronics?
HintThe digital clock is an example of digital electronics
92). Which one of the following is not an example for digital electronics?
HintThe UPS is not an example of digital electronics
93). Which one of the following signal stores in the form of binary bit?
HintThe digital signals stores in the form of binary bit
94). The CDs, DVDs, computers are few examples of ___________ signal?
HintThe CDs, DVDs, computers are a few examples of digital signal
95). What is the output for the below circuit?

Logic Circuit

HintThe output for the above circuit is one
96). For the below circuit the input combination should be ___________, if the output F is 1
Logic Circuit
HintFor the below circuit the input combination should be A=0, B=0, C=1, if the output F is 1
97). Which one of the following is a correct Boolean expression for the below circuit?
Logic Circuit
HintThe correct Boolean expression for the above circuit is M1=(P XOR Q) XOR R
98). The output should be 1 if the inputs of the circuit A, B, C is equal to ______________
Logic Circuit
HintThe output should be 1 if the inputs of the circuit A, B, C is equal to 0, 1, 1
99). The below logic diagram is a 4 bit ___________________ shift register?
Logic Circuit
HintThe above logic diagram is a 4 bit serial-in, serial-out, shift right, shift left sift register
100). The below logic diagram is a 4 bit ___________________ shift register?
Logic Circuit
HintThe above logic diagram is a 4 bit serial-in, parallel-out shift register
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