Latches Question & Answers October 18, 2021 By WatElectronics This article lists 100 Latches MCQs for engineering students. All the Latches Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up their fundamentals on Latches. A bistable device like a latch is a temporary storage device that includes two stable states. As compared to flip flops, Latches are extremely related because they too include two stable states. In flip-flops, feedback is used to connect the outputs toward the opposite inputs. The main difference between these two is the technique used for modifying their state. A latch verifies all its inputs constantly & the output alters instantly because there is a change within the input. Therefore latches are applicable in asynchronous sequential logic circuits. There are different types of latches available like SR Latch, D latch. Gated S-R Latch, JK Latch, Gated D Latch, and T Latch. So based on the applications, the type of latch is used in different circuits. The applications of latches mainly include; these are memory elements used to store the data in bits form. These are used widely for storing the data as well as the codes for computations. These are used as storage devices in power gating and clock circuits. 1). Latches includes...? Inverters Inductors Frequency generators Timing generators Hint 2). Which of the following is the best example of Latch? Astable multivibrator Monostable multivibrator Bistable multivibrator None of the above Hint 3). How many of the stable states do a Latch can include? 1-stable state 2-stable states 3-stable states None of these Hint 4). Why latch is called a memory device? It includes 4 bits of internal memory It can store 1-bit of data It can share 8-bits of data None of the above Hint 5). What are the two stable states of latches? Monostable and Astable High output & Low input High input & Low output Low output & High output Hint 6). The types of latches are 2 4 6 8 Hint 7). What is S & R in SR-latch? System Rated Set Ready Set Reset None of the above Hint 8). The inputs of an SR latch includes? 1 input 2 inputs 4 inputs 8 inputs Hint 9). When both SR latches inputs are high, then the latch will go Stable Unstable Metastable None of the above mentioned Hint 10). The working of the NAND latch includes...? When both the inputs are 1 When both the inputs are 0 When both the inputs are inverted When both the inputs don't care Hint 11). The analysis process of SR latch primary step is to..? Label states Label tables Label inputs Label outputs Hint 12). A feedback loop which can be formed in latch by Inverters is constantly...? Changing Infinite Positive Negative Hint 13). Latch as one with a triggering circuit can form a...? Inductor Timing generator Flip flop Sine generator Hint 14). Which of the following doesn't contain a latch? Inverter State output State input Clock Hint 15). The example of a level-triggered device is? JL FF SR FF Latches S FF Hint 16). Which of the subsequent latch is NOT a latch? JK latch Gated D-Latch SR latch Gated SR latch Hint 17). The invalid condition for SR-Latch happens as both the S & R are...? When S = high, & R = low High When S = low, & R = high Low Hint 18). Which of the following circuit is another name of the sequential circuit? Latch Strobe Flip-flop None of the above Hint 19) Which of the following operations are faster? Flip-flops Sequential circuits Combinational circuits Latches Hint 20). The SR-Latch inputs are...? X &Y S & R A & B J & K Hint 21). The SR latch outputs are...? Q & Q’ X & Y A & B S & R Hint 22). When NAND latch works? When both inputs are low When both inputs are high When inputs are inverted None of the above Hint 23). The essential devices in Latches…? Resistors Diodes Inverters Timing Generators Hint 24). Which of the following device is used to interface o/p devices? FFS Encoders Latches Multiplexers Hint 25). The latch working mainly depends on? CLK level Edge Memory Time Hint MCQs on Latches for Interviews 26). In SR-Latch when the invalid state takes place? When the inputs are low When the inputs are high When S is high and R is low When S is low and R is high Hint 27). Which of the following FF can be used like a Latch? T-FF D-FF SR FF JK FF Hint Please refer to this link to know more about Flip Flops 28). The present state in synchronous circuits can be determined through….? Latches Flip Flops Combinational Logic Circuits Multiplexers Hint 29). Unlocked FFs are also called? Combinational Logic Circuits Multiplexers Latches Logic Gates Hint 30). Latch circuit works on …states based on the triggering signals? 2 3 4 5 Hint 31). When enable pin of the latch is high then both the inputs are…..? High Low Medium No change Hint 32). What are the inputs of a Latch? High & :Low SET and RESET 0 & 1 A & B Hint 33). SR latch can be designed with…..logic gates? 2 AND 2 NOR 2 Ex-OR 2 NOR Hint 34). The gated SR latch includes…..inputs? 2 3 4 5 Hint 35). Which of the following pin enables the inputs of Gates SR Latch? Enable Pin Data Pin Register Pin Output Pin Q Hint 36). Which of the following is used to connect the enable pin in Gated SR Latch? Logic Gate Switch Transistor Diode Hint 37). Which of the following flip flop is similar to D latch? SR T D JK Hint 38). Gated D Latch includes…inputs? 2 3 4 5 Hint 39). Which of the following latch is used to design a gated D latch? Jk D Gated SR Latch T Hint 40). Which of the following latch is similar to the JK latch? D SR T Gated SR Hint 41). Which of the following latch can be formed by shortening the inputs of the JK latch? SR T D Gated SR Hint 42). When the T latch output will toggle? When the input is high Low Infinite None of the above Hint 43). How many types of latches are there in digital electronics? 2 4 6 8 Hint 44). Why is latch is called a bistable multivibrator? It includes two stable states Its working is similar to multivibrator It is a combinational circuit It removes the stored data Hint 45). In digital electronics systems, the basic building blocks are? Flip flops & Latches Logic Gates Integrated Circuits Multiplexers Hint 46). The example of a bistable multivibrator is….? Latch Flip Flop Integrated Circuits Logic Gate Hint 47). Flip flops & latches are the basic building blocks of……? Encoders Sequential Circuits Integrated Circuits Decoders Hint 48). Latches can be designed by using….? Encoders Logic Gates ICs Multiplexers Hint 49). Latches are used to built…? Flip Flops Logic Gates Encoders Decoders Hint 50). Logic gates can be built with…? Flip Flops Transistors Encoders Multiplexers Hint Please refer to this link to know more about Logic Gates MCQs on Latches for Exams 51). Which of the following has positive feedback…..? Transistors Encoders Latch Multiplexers Hint 52). Which of the following doesn’t include a latch? Memory CLK signal Logic Gates Enable Hint 53). How can we design a circuit without using logic gates and that are not combinational? Using Feedback Oscillator Inverter None Hint 54). If the feedback in the circuit is positive then it tends to include…? Signals Stable States Enable Pin Inverter Hint 55). The feedback loop which is formed in a latch by an inverter is always…..? Negative Infinite Positive Always Changing Hint 56). Which of the following is a popular microprocessor chip? 74LS337 74LS373 74LS278 74LS120 Hint Please refer to this link to know more about Microprocessor 57). A switch debouncing can be possible by using a…….? Integrator SR Latch D Flip Flop Multiplexer Hint 58). Which of the following is cross-coupled to make an SR latch with an active high i/p? 2 AND gates 2 OR Gates 2 NOR Gates 2 NOT Gates Hint 59). Which of the following statement is correct? A FF is edge-triggered A FF is level triggered A latch is not level triggered A latch edge-triggered Hint 60). Which of the following is one of the drawbacks of a latch Chance of metastability Expensive Sensitive Has many stable states Hint 61). As compared to FFs, the latch design is ….? Hard Very flexible Not easy Complicated Hint 62). Latch occupies very less area because of….? Its size is small Nano Design It uses fewer flip flops to design None of the above Hint 63). In high-speed circuit design, the latch performance is….? Very quick Slow Medium Very slow Hint 64). Which of the following is the main benefit of a latch? Latches use fewer components Very speed operation Uses more logic gates It borrows required time to complete the circuit design if the design is not completed in time Hint 65). In which of the following, the circuit analyzing is difficult? Latches Flip Flops Multiplexers Demultiplexers Hint 66). The testing of the latch circuit can be done by using…..? Multimeter Additional CAD program Simmulation Voltmeter Hint 67). In asynchronous systems, which of the following latch is used? T Latch D Latch SR Latch JK Latch Hint 68). In synchronous 2-phase systems, which latches are used? SR Latch D Latch T Latch JK Latch Hint 69). Single bit storage elements are called? Flip Flops Latches Logic Gates Encoders Hint 70). Which of the following latch is similar to RS? D Latch T Latch JK latch Gated SR Latch Hint 71). Which of the following latch is modified to form a gated D-latch? T Latch D Latch SR latch Gated SR Latch Hint 72). When the JK latch inputs are shorted then which of the below latch is formed? T Latch SR latch D Latch Gated SR Latch Hint 73). Why latches don’t work as a register? Lack of a CLK Signal Memory Binary Inputs Outputs Hint 74). Sequential circuits are available in ….types? 2 4 5 6 Hint 75). In sequential circuits, which of the following element provides memory? Encoder Decoder Combinational Logic Circuit Flip Flop Hint Latches MCQs for Quiz 76). At the end of bits in a shift register has……neighbors? 2 4 6 8 Hint 77). SR latches are also known as…? D Flip Flops Direct Coupled RS FFs Multiplexers None of above Hint 78). How a NAND-based SR latch is changed into an SR latch? By arranging a D-latch at every i/p By arranging an inverter at every i/p Both an inverter & a latch at its i/p None of the above Hint 79). Which of the following circuits have quick operations? Flip Flops Combinational Circuits Latches Multiplexers Hint 80). In SR latch based on NAND gate, when the S=R=1 then what is the condition of the latch? Outputs will be low Outputs will be high Reset No change Hint 81). When SR Latch is designed with NAND gates then the circuit is called as….? Active low circuit Active high circuit Combinational circuit Logic circuit Hint 82). Which of the following latch is known as transparent latch? D Latch SK Latch T Latch None of the above Hint 83). Which of the following circuits is known as two-state devices? Sequential logic circuits Logic gate circuits Combinational logic circuits None of the above Hint 84). How many categories are there in sequential logic circuits? 1 3 5 7 Hint 85). Sequential circuits are signified with….? Infinite state machine Finite state machine Multiplexers Encoders Hint 86). The storage elements that function through levels of the signal are known as…? Flip Flops Multiplexers Encoders Latches Hint 87). The output crossing in SR Latch is called as? Coupling Cross-coupling Interfacing None of the above Hint 88). The amount of power used by latches is…..? Less Huge Very high None of the above Hint 89). Latches are better than….? Multiplexers Flip flops Logic gates Encoders Hint 90). In digital electronics, memories are considered as…? Essential components Storage elements Detachable elements Protection devices Hint 91). The working of latches mainly depends on…? Enable i/p function Based on inputs Based on Memory Based on Logic Function Hint Please refer to this link to know more about Digital Electronics MCQs 92). Transparent latches are used in….? Synchronous systems Asynchronous systems Digital systems Control systems Hint 93). Which of the following IC is a quadruple transparent latch? 74HC76 74HC75 73HC20 75HC40 Hint 94). The series of 74HC75 latch is? 7400 series 74 series 74H series 7H series Hint 95). The first electronic FF was invented by….? William George William Jouls William Eccles Lindley Hint 96). The electronic FF was invented in which year? 1920 1910 1928 1918 Hint 97). In which of the following circuits, the o/p is mainly dependent on the present input? Combinational circuits Sequential circuits Logic circuits Multiplexers Hint 98). In which of the following circuits, the o/p depend on the history of input? Sequential circuits Combinational circuits Logic circuits Multiplexers Hint 99). Which of the following device is a temporary storage device? Flip flop Logic gates Latch Multiplexers Hint 100). What is the property of a latch? Level Sensing Memory Storage Voltage Detection Triggering Hint Time is Up! Time's up
