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Flip Flops Question & Answers

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This article lists 100 Flip Flop MCQs for engineering students. All the Flip Flop Questions & Answers given below includes solution and link wherever possible to the relevant topic.

In a sequential circuit design, flip-flops are the basic building blocks. In a short or in a very simple way we can say that flip flop is on and off. The sequential circuit is generally a combinational circuit with memory. The flip flop stores only binary data that has two states they are logic 1 and logic 0. The set-reset, JK, delay, and trigger or toggle are the most commonly used flip flops.

1). The output of the sequential circuit depends upon _________
HintThe output of the sequential circuit depends upon present input and present state (past output)
2). The flip flops are categorized into ________
HintThe flip flops are categorized into four types they are set-reset, trigger or toggle, delay, and J-K flip flop
3). What is the standard form of S-R flip flop?
HintThe standard form of S-R flip flop is a set-reset flip flop
4). When the set is enabled in S-R flip flop then the output will be __________
HintWhen the set is enabled in S-R flip flop then the output will be set means one
5). When the set is disabled and reset is enabled in S-R flip flop then the output will be __________
HintWhen the set is disabled and reset is enabled in S-R flip flop then the output will be reset means zero
6). When both set and reset are disabled in S-R flip flop then the output will be __________
HintWhen set and reset neither them are enabled then there will be no change means the previous output will be the present output
7). When both set and reset are enabled in S-R flip flop then the output will be __________
HintWhen both set and reset are enabled in S-R flip flop then the output will be in Indeterminate condition that is known as a race condition
8). In which flip flop the present input will be the next output?
HintIn D-flip flop the present input will be the next output
9). The J-K flip flops has ___________ memory
HintThe J-K flip flops have a true memory
10). The preset input is used to make output ______
HintThe preset input is used to make output Q=1
11). The clear input is used to make output ______
HintThe clear input is used to make output Q=0
12). The preset and clear inputs don’t need synchronization?
HintYes, the preset and clear inputs both doesn’t need synchronization
13). When preset=0, clear=1 then the output will be ________
HintWhen preset=0, clear=1 then the output will be one
14). When preset=1, clear=0 then the output will be ________
HintWhen preset=1, clear=0 then the output will be zero
15). There are total ______ steps for flip flop conversions
HintThere are total of five steps for flip flop conversions they are not available required flip flop, write characteristics table of required F/F, write excitation table of available F/F, solve Boolean expression and draw circuit
16). In SR to JK flip flop conversion which one is an available flip flop?
HintIn SR to JK flip flop conversion, SR flip flop is an available flip flop
17). In SR to JK flip flop conversion which one is a required flip flop?
HintIn SR to JK flip flop conversion JK flip flop is required flip flop
18). The shift registers are categorized into ________
HintThe shift registers are categorized into four types they are SISO, PIPO, SIPO, and PISO
19). How many possible conversions are there to convert SR flip flop to other flip flops?
HintThe SR flip flop convert into other flip flops in three ways they are SR to JK, T, and D flip flop
20). A flip flop is an __________
HintA flip flop is an edge-sensitive and synchronous device
21). The operation of the flip flop is slow?
HintYes, the operation of the flip flops are very slow compared to latches that are only due to the clock signal
22). How many types of latches are there?
HintThere are six types of latches are there they are SR, gated SR, D, gated D, JK, and T latch
23). The flip flop requires _________
HintThe flip flop requires more gates and power when compared to latches
24). _________ are the applications of flip flop
HintThe registers, counters, storage devices, frequency dividers, etc are the applications of flip flop
25). Does the flip flop based on enable function input?
HintNo, the flip flops don’t base on enabling function input it based on clock pulses

Flip-Flops Important Questions with Hints

26). The flip flops works with ________
HintThe flip flop works with both clock signal and binary inputs
27). The flip flop can’t be used as a register is it true?
HintNo, the flip flops can be used as a register
28). What is the standard form of T flip flop?
HintThe standard form of T flip flop is a trigger or toggle flip flop
29). The JK flip flop convert to other flip flops in ________?
HintThe JK flip flop convert into other flip flops in three ways they are JK to SR, T, and D flip flop
30). How many types of triggers are there?
HintThere are three types of triggers are there they are edge, level, and pulse triggering
31). When S=0, R=0, CLK=X then the output will be ___________
HintWhen S=0, R=0, CLK=X then there will be no change in the output
32). When reset is low and set is high in a NOR D-latch table then the output will be __________
HintWhen reset is low and set is high in a NOR D-latch table then the output will be high
33). When reset is high and set is low in a NOR D-latch table then the output will be __________
HintWhen reset is high and set is low in a NOR D-latch table then the output will be low
34). When reset is high and set is low in a NAND D-latch table then the output will be __________
HintWhen reset is high and the set is low in a NAND D-latch table then the output will be low
35). When reset is low and set is high in a NAND D-latch table then the output will be __________
HintWhen reset is low and the set is high in a NAND D-latch table then the output will be high
36). Which circuit doesn’t have a memory unit?
HintThe combinational circuit doesn’t have a memory unit whereas the sequential circuit has a memory unit
37). ________ is an example for sequential circuit
HintThe flip flop is an example of a sequential circuit
38). _______ is an example for combinational circuit
HintThe multiplexer is an example of a combinational circuit
39). How many possible conversions are there to convert T flip flop to other flip flops?
HintThe toggle or trigger flip flop convert to other flip flops in three ways they are T to JK, SR, and D flip flop
40). What is the standard form of D flip flop?
HintThe standard form of D flip flop is delay flip flop
41). How many inputs does the RS latch have?
HintThe RS latch has two inputs they are set and reset
42). When triggers on high clock level then this type of trigger is known as ________
HintWhen triggers on high clock level then this type of trigger is known as high-level triggering
43). When triggers on low clock level then this type of trigger is known as ________
HintWhen triggers on low clock level then this type of trigger is known as low-level triggering
44). The flip flops require ________
HintThe flip flops require more area and more power compare to latches
45). The type of operation performed by flip flop is _______
HintThe type of operation performed by flip flop is synchronous
46). The type of operation performed by latches is _______
HintThe type of operation performed by latches is asynchronous
47). The flip flop is a _______ device
HintThe flip flop is a bi-stable device that is used to store either o or 1
48). In which year the first flip flop was invented?
HintIn 1918 the first flip flop was invented
49). How many possible conversions are there to convert D flip flop to other flip flops?
HintThe Delay flip flop convert into other flip flops in three ways they are D to JK, T, and SR flip flop
50). Who invented first flip flop?
HintThe first flip flop was invented by F.W.Jordan and William Eccles
Read more about Flipflops

Flip-Flops Important Questions for Engineering Students

51). The set-reset flip flops constructed by cross-coupling of ______ gates
HintThe set-reset flip flops constructed by cross-coupling of NAND or NOR gates
52). The sequential circuits are categorized into _______
HintThe sequential circuits are categorized into two types they are synchronous and asynchronous sequential circuits
53). How many inverters does the basic latch consists of?
HintThe basic latch consists of two inverters
54). How many additional AND gates does SR flip flop consists of?
HintThe set-reset flip flop consists of two AND gates at the set and resets inputs of the S-R latch
55). The J-K flip flop characteristic similar to _________ flip flop
HintThe J-K flip flop characteristic similar to set-reset flip flop
56). The latch is a __________ device
HintThe latch is a bi-stable device that is used to store either o or 1
57). When toggle condition occurs in JK flip flop?
HintWhen both J and K inputs are high then their toggle condition occurs
58). The no-change conditions occur when ________ in JK flip flop
HintThe no-change condition occurs when J=0, K=0 in JK flip flop
59). The flip flop are categorized into _______ types
HintThe flip flop is categorized into four types they are SR, D, JK, and T flip flops
60). How many outputs does D-flip flop have?
HintThe D-flip flop has only one output
61). When the clock input is low in a D flip flop then the input of the D flip flop is _______
HintWhen the clock input is low in a D flip flop then there is no change in the delay input
62). When the clock input is high and D input is high then the output of a D flip flop will be _______
HintWhen the clock input is high and D input is high then the output of a D flip flop will be low
63). The combinational circuit have ____________ number of stable states
HintThe combinational circuit has two stable states they are zero and one
64). How many inputs does D flip flop have?
HintThe D flip flop has only one input
65). The flip flops are activated by _____________ trigger
HintThe flip flops are activated by either positive or negative edge trigger
66). The RS flip flop input clock is given to _______
HintThe RS flip flop input clock is given to pulse
67). How many NAND gates does the D flip flop circuit consists of?
HintThe D flip flop circuit consists of four NAND gates
68). The inputs of the SR, JK, and D flip flop are the _____ inputs
HintThe inputs of the SR, JK, and D flip flop are the synchronous inputs
Read more about Gates
69). The counters are categorized into ______
HintThe counters are categorized into three types they are asynchronous/synchronous modulus, and single & multimode
70). How many states does the decimal counter have?
HintThe decimal counter has ten states
71). The synchronous counter is one type of _______ counter
HintThe synchronous counter is one type of medium-scale integrated counter
72). The BCD is one type of counter which is also known as __________
HintThe BCD is one type of counter which is also known as a decade counter
73). The counter circuit parallel outputs represent _________
HintThe counter circuit parallel outputs represent clock count
74). How many of states are there in a 4 bit counter?
HintThe number of states in a four-bit counter is 16
75). An IC 7493 is a______ bit binary ripple counter
HintAn IC 7493 is a four-bit binary ripple counter

Flip-Flops Important Questions for Interviews

76). How many JK master-slave flip flops are required for IC 7493?
HintIC 7493 required four JK master-slave flip flops
77). Which IC is a decade counter?
HintAn IC 7490 is a decade counter
78). How many pins does ripple counter IC have?
HintThe ripple counter IC has 14 pins
Read more about Counters
79). __________ type of counter counts in an upward manner
HintThe up counter is a type of counter which counts in an upward manner
80). In which manner does down counter count?
HintThe down counter counts in a downward manner
81). The high-speed counter is a __________ type of counter
HintThe high-speed counter is a synchronous type of counter
82). The another name for fundamental mode is ____________
HintThe other name for fundamental mode is pulse operation
83). Is it true that the up-down counter is a combination of latches and flip-flops?
HintNo, the up-down counter is a combination of latches and flip flops, it is a combination of up and down counter
84). How many of states are there in a 3 bit counter?
HintThe number of states in a three-bit counter is 8
85). Which one is also called as a multimode counter?
HintThe up and down counter is also called a multimode counter
86). __________ is a truncated modulus example
HintModulus-9, 11, and 15 is a truncated modulus example
87). Is register is a type of combinational circuit?
HintNo, the register is not a type of combinational circuit, it’s a type of sequential circuit
88). What is the standard form of SISO?
HintThe standard form of SISO is Serial Input Serial Output
89).What is the standard form of PIPO?
HintThe standard form of PIPO is Parallel Input Parallel Output
90). The Johnson and ring shift counters are _________ type of counters
HintThe Johnson and ring shift counters are the synchronous type of counters
91). Does an IC 74HC195 use for all SISO, PIPO, SIPO, and PISO operations?
HintYes, an IC 74HC195 used for all SISO, PIPO, SIPO, and PISO operations
92). How many bits of information do flip-flop store?
HintThe flip flops store only one bit of information
93). The very large scale integration chip is made up of _______
HintThe very large scale integration chip is made up of BICMOS, CMOS, BJT, and NMOS
94). How many of states are there in a 2 bit counter?
HintThe number of states in a two-bit counter is 4
95). What is the standard form of SOSI?
HintThe standard form of SOSI is Serial Output Serial Input
96).What is the standard form of POSI?
HintThe standard form of POSI is Parallel Output Serial Input
97). Read-only memory consists of _______ arrays
HintRead-only memory consists of both NAND and OR arrays
98). What is the available flip flop in T to D flip flop conversion?
HintThe available flip flop in T to D flip flop conversion is T flip flop
99). What is the required flip flop in T to D flip flop conversion?
HintThe required flip flop in T to D flip flop conversion is D flip flop
100). What is the required flip flop in JK to D flip flop conversion?
HintThe required flip flop in JK to D flip flop conversion is D flip flop

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