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101.	The inputs of SR latch are ___________(a) x and y(b) a and b(c) s and r(d) j and kThe question was asked in semester exam.My question comes from Latches in portion Flip-Flops of Digital Circuits
Answer» Right CHOICE is (c) s and R Easiest explanation: SR or Set-Reset latch is the simplest TYPE of bistable multivibrator having two STABLE states. The inputs of SR latch are s and r while outputs are Q and q’. It is clear from the diagram:

102.	The first step of the analysis procedure of SR latch is to ___________(a) label inputs(b) label outputs(c) label states(d) label tablesThe question was asked in examination.This is a very interesting question from Latches in division Flip-Flops of Digital Circuits
Answer» The correct answer is (b) label outputs The best I can explain: All FLIP flops have at least ONE output labeled Q (i.e. inverted). This is so because the flip flops have inverting gates inside them, hence in ORDER to have both Q and Q COMPLEMENT available, we have atleast one output labelled.

103.	The NAND latch works when both inputs are ___________(a) 1(b) 0(c) Inverted(d) Don’t caresThe question was posed to me in an online quiz.The doubt is from Latches in section Flip-Flops of Digital Circuits
Answer» CORRECT OPTION is (a) 1 Explanation: The NAND latch works when both INPUTS are 1. Since both of the inputs are inverted in a NAND latch.

104.	How many types of latches are ___________(a) 4(b) 3(c) 2(d) 5This question was addressed to me in a national level competition.This is a very interesting question from Latches in portion Flip-Flops of Digital Circuits
Answer» Right choice is (a) 4 The EXPLANATION: There are FOUR types of latches: SR latch, D latch, JK latch and T latch. D latch is a MODIFIED form of SR latch WHEREAS, T latch is an advanced form of JK latch.

105.	The outputs of SR latch are ___________(a) x and y(b) a and b(c) s and r(d) q and q’This question was posed to me in unit test.This question is from Latches in division Flip-Flops of Digital Circuits
Answer» Correct answer is (d) Q and q’ Easy explanation: SR or Set-Reset latch is the SIMPLEST type of bistable MULTIVIBRATOR having two stable states. The inputs of SR latch are s and r while OUTPUTS are q and q’. It is clear from the DIAGRAM: .

106.	The SR latch consists of ___________(a) 1 input(b) 2 inputs(c) 3 inputs(d) 4 inputsI had been asked this question in quiz.This question is from Latches in portion Flip-Flops of Digital Circuits
Answer» The correct choice is (b) 2 inputs The explanation is: SR or Set-Reset LATCH is the simplest TYPE of bistable MULTIVIBRATOR having two stable states. The diagram of SR latch is shown below:

107.	The full form of SR is ___________(a) System rated(b) Set reset(c) Set ready(d) Set RatedI had been asked this question at a job interview.This intriguing question originated from Latches topic in portion Flip-Flops of Digital Circuits
Answer» Right option is (b) Set reset To ELABORATE: The full FORM of SR is set/reset. It is a TYPE of LATCH having two stable states.

108.	Two stable states of latches are ___________(a) Astable & Monostable(b) Low input & high output(c) High output & low output(d) Low output & high inputThe question was posed to me in exam.I'd like to ask this question from Latches topic in portion Flip-Flops of Digital Circuits
Answer» Correct answer is (c) High output & low output Easy EXPLANATION: A latch has two stable states, following the principle of Bistable MULTIVIBRATOR. There are two stable states of LATCHES and these states are high-output and low-output.

109.	Why latches are called memory devices?(a) It has capability to stare 8 bits of data(b) It has internal memory of 4 bit(c) It can store one bit of data(d) It can store infinite amount of dataI have been asked this question in an interview for job.My question is from Latches in chapter Flip-Flops of Digital Circuits
Answer» Correct choice is (c) It can store one bit of data To explain I would say: LATCHES can be MEMORY devices, and can store one bit of data for as LONG as the DEVICE is POWERED. Once device is turned off, the memory gets refreshed.

110.	Latch is a device with ___________(a) One stable state(b) Two stable state(c) Three stable state(d) Infinite stable statesI got this question by my school principal while I was bunking the class.Question is taken from Latches topic in division Flip-Flops of Digital Circuits
Answer» Correct ANSWER is (B) TWO STABLE state Easiest explanation: Since a latch works on the PRINCIPAL of bistable multivibrator. A Bistable multivibrator is one in which the circuit is stable in either of two states. It can be flipped from one state to the other state and vice-versa. So a latch has two stable states.

111.	A latch is an example of a ___________(a) Monostable multivibrator(b) Astable multivibrator(c) Bistable multivibrator(d) 555 timerThe question was asked in an interview for internship.This interesting question is from Latches topic in section Flip-Flops of Digital Circuits
Answer» Right answer is (C) BISTABLE multivibrator Easiest explanation: A latch is an example of a bistable multivibrator. A Bistable multivibrator is ONE in which the circuit is stable in either of TWO states. It can be flipped from one STATE to the other state and vice-versa.

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