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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...?
HintThe output provided by this circuit is quite opposite to its input
2). Which of the following is the best example of Latch?
HintIt includes two stable states
3). How many of the stable states do a Latch can include?
HintIt is equal to the stable states used in bistable multivibrator
4). Why latch is called a memory device?
HintIt stores single bit of data
5). What are the two stable states of latches?
HintMinimum and maximum outputs
6). The types of latches are
HintThe types are ranges from < 5 > 3
7). What is S & R in SR-latch?
HintThese are used to set and reset the signals
8). The inputs of an SR latch includes?
HintThe inputs are S & R
9). When both SR latches inputs are high, then the latch will go
HintParticular excited state of a system that has a longer lifetime
10). The working of the NAND latch includes...?
HintWhen the inputs are high
11). The analysis process of SR latch primary step is to..?
HintWhen the outputs are label
12). A feedback loop which can be formed in latch by Inverters is constantly...?
HintWhen inverters are changing constantly
13). Latch as one with a triggering circuit can form a...?
HintThe short form of this is "FF''
14). Which of the following doesn't contain a latch?
HintIt is also called as clock signal
15). The example of a level-triggered device is?
HintThese are used to store the information
16). Which of the subsequent latch is NOT a latch?
HintThis is one type of flip flop
17). The invalid condition for SR-Latch happens as both the S & R are...?
HintWhen the set and reset are maximum
18). Which of the following circuit is another name of the sequential circuit?
HintIt is also known as bistable multivibrator
19) Which of the following operations are faster?
HintThese circuits uses different logic gates
20). The SR-Latch inputs are...?
HintThese are also known as set and reset
21). The SR latch outputs are...?
HintThe outputs are high and low
22). When NAND latch works?
HintWhen both inputs of NAND latch is 1
23). The essential devices in Latches…?
HintThese are also called AC drives
24). Which of the following device is used to interface o/p devices?
HintThe device which has two stable states
25). The latch working mainly depends on?
HintWhen the CLK is high, then all the input effects will come into view on o/p.

MCQs on Latches for Interviews

26). In SR-Latch when the invalid state takes place?
HintWhen S & R are high
27). Which of the following FF can be used like a Latch?
HintThis type of FF uses delay within input using one CLK cycle
Please refer to this link to know more about Flip Flops
28). The present state in synchronous circuits can be determined through….?
HintIt is also called a bistable multivibrator
29). Unlocked FFs are also called?
HintIt depends on input to change its output
30). Latch circuit works on …states based on the triggering signals?
HintThe states are active low and active high
31). When enable pin of the latch is high then both the inputs are…..?
HintWhen the enable pin is low then both the inputs are high.
32). What are the inputs of a Latch?
HintThe outputs will be Q Q’
33). SR latch can be designed with…..logic gates?
HintThe function of this gate is quite opposite to the OR gate
34). The gated SR latch includes…..inputs?
HintThe inputs are SET, RESET, and Enable pin
35). Which of the following pin enables the inputs of Gates SR Latch?
HintThis pin enables the operation of both the inputs
36). Which of the following is used to connect the enable pin in Gated SR Latch?
HintIt interrupts the flow of current
37). Which of the following flip flop is similar to D latch?
HintThe difference between this FF and latch is to enable pin
38). Gated D Latch includes…inputs?
HintThe inputs are enabled and data
39). Which of the following latch is used to design a gated D latch?
HintThe inputs of this latch is SET & RESET
40). Which of the following latch is similar to the JK latch?
HintIn this latch, there is no o/p feedback to the inputs
41). Which of the following latch can be formed by shortening the inputs of the JK latch?
HintThis is also called toggle latch
42). When the T latch output will toggle?
HintWhen the input of the T latch is 1
43). How many types of latches are there in digital electronics?
HintThey are D, SR, Gated SR, Gated D, T, and JK
44). Why is latch is called a bistable multivibrator?
HintThe two stable states are Low and High
45). In digital electronics systems, the basic building blocks are?
HintThese circuits includes two stable states which are used to store the data
46). The example of a bistable multivibrator is….?
HintBoth the latch and bistable multivibrator includes two stable states.
47). Flip flops & latches are the basic building blocks of……?
HintThe output of these circuits depends on the input timing
48). Latches can be designed by using….?
HintA physical electronic device that is used to implement a Boolean function.
49). Latches are used to built…?
HintIt is used to store a 1-bit data
50). Logic gates can be built with…?
HintA semiconductor device is used to switch/amplify electronic signals
Please refer to this link to know more about Logic Gates

MCQs on Latches for Exams

51). Which of the following has positive feedback…..?
HintIt is mainly used to store state data
52). Which of the following doesn’t include a latch?
HintThis can be generated through a CLK generator
53). How can we design a circuit without using logic gates and that are not combinational?
HintBy creating loops within the circuit
54). If the feedback in the circuit is positive then it tends to include…?
HintA latch includes high output & low output
55). The feedback loop which is formed in a latch by an inverter is always…..?
HintIt exacerbates the results of a small trouble
56). Which of the following is a popular microprocessor chip?
HintIt is an octal latch chip
Please refer to this link to know more about Microprocessor
57). A switch debouncing can be possible by using a…….?
HintIt is an asynchronous device
58). Which of the following is cross-coupled to make an SR latch with an active high i/p?
HintThe o/p of this gate is positive when two inputs are negative
59). Which of the following statement is correct?
HintFF is an alteration to the latch
60). Which of the following is one of the drawbacks of a latch
HintWhenever a latch is level-sensitive then it is caused
61). As compared to FFs, the latch design is ….?
HintLatch design in digital electronics is easy
62). Latch occupies very less area because of….?
HintIts shape is very small
63). In high-speed circuit design, the latch performance is….?
HintLatches are asynchronous within the design of high-speed circuits
64). Which of the following is the main benefit of a latch?
HintIf the circuit design is not finished in the set time they take time from others
65). In which of the following, the circuit analyzing is difficult?
HintBecause latches have level-sensitive property
66). The testing of the latch circuit can be done by using…..?
HintIt uses an extra CAD program to test the circuit
67). In asynchronous systems, which of the following latch is used?
HintThese latches are used as input and output ports
68). In synchronous 2-phase systems, which latches are used?
HintFor decreasing the transit count these latches are used
69). Single bit storage elements are called?
HintThese are used to store the data and computing
70). Which of the following latch is similar to RS?
HintIn RS latch, the o/p feedback is not present
71). Which of the following latch is modified to form a gated D-latch?
HintIn this latch, the R input should be changed to an inverted S
72). When the JK latch inputs are shorted then which of the below latch is formed?
HintWhen the input of this latch is high then the output will be toggled
73). Why latches don’t work as a register?
HintLatches doesn’t include a CLK signal
74). Sequential circuits are available in ….types?
HintThey are synchronous and asynchronous
75). In sequential circuits, which of the following element provides memory?
HintA memory device that stores a single data bit

Latches MCQs for Quiz

76). At the end of bits in a shift register has……neighbors?
HintShift register has two neighbors at the end of the bit
77). SR latches are also known as…?
HintIt has two inputs like SET/RESET
78). How a NAND-based SR latch is changed into an SR latch?
HintBy connecting a latch and an inverter at its input
79). Which of the following circuits have quick operations?
HintIn these circuits, different logic gates can be used
80). In SR latch based on NAND gate, when the S=R=1 then what is the condition of the latch?
HintThere is no change within the latch condition
81). When SR Latch is designed with NAND gates then the circuit is called as….?
HintThis circuit activates through a -Ve level trigger
82). Which of the following latch is known as transparent latch?
HintThis latch is known as a data latch
83). Which of the following circuits is known as two-state devices?
HintThese circuits use memory elements
84). How many categories are there in sequential logic circuits?
HintThe categories are event, CLK and pulse driven
85). Sequential circuits are signified with….?
HintIt is also called FSM
86). The storage elements that function through levels of the signal are known as…?
HintThese are used to design asynchronous sequential circuit
87). The output crossing in SR Latch is called as?
HintThis circuit uses cross-coupling feedback
88). The amount of power used by latches is…..?
HintLatches works with very little power
89). Latches are better than….?
HintTo get the quick realizations, these are very better
90). In digital electronics, memories are considered as…?
HintMemory in digital electronics is a very essential component
91). The working of latches mainly depends on…?
HintIt depends on the function of enable input
Please refer to this link to know more about Digital Electronics MCQs
92). Transparent latches are used in….?
HintThese systems are quite opposite to synchronous
93). Which of the following IC is a quadruple transparent latch?
HintThese ICs are manufactured by Texas instruments
94). The series of 74HC75 latch is?
HintThese are digital logic ICS
95). The first electronic FF was invented by….?
HintHe is the British physicists
96). The electronic FF was invented in which year?
HintIt was invented by two scientists namely William Eccles & F. W. Jordan
97). In which of the following circuits, the o/p is mainly dependent on the present input?
HintThese circuits don’t have a memory element
98). In which of the following circuits, the o/p depend on the history of input?
HintThese circuits have the least single memory element
99). Which of the following device is a temporary storage device?
HintThese devices include two stable states
100). What is the property of a latch?
HintBecause of this property, circuit analyzing is hard
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