Digital Logic Circuits Set 5

Computer Science Engineering (CSE)

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This set of Digital Logic Circuits DLC Multiple Choice Questions & Answers (MCQs) focuses on Digital Logic Circuits Set 5

Q1 | A basic S-R flip-flop can be constructed by cross-coupling of which basic logic gates?
  • and or or gates
  • xor or xnor gates
  • nor or nand gates
  • and or nor gates
Answer: nor or nand gates
Q2 | The logic circuits whose outputs at any instant of time depends only on the present input but also on the past outputs are called
  • combinational circuits
  • sequential circuits
  • latches
  • flip-flops
Answer: sequential circuits
Q3 | Whose operations are more faster among the following?
  • combinational circuits
  • sequential circuits
  • latches
  • flip-flops
Answer: combinational circuits
Q4 | How many types of sequential circuits are?
  • 2
  • 3
  • 4
  • 5
Answer: 2
Q5 | The sequential circuit is also called                        
  • flip-flop
  • latch
  • strobe
  • adder
Answer: latch
Q6 | The basic latch consists of                        
  • two inverters
  • two comparators
  • two amplifiers
  • two adders
Answer: two inverters
Q7 | In S-R flip-flop, if Q = 0 the output is said to be                        
  • set
  • reset
  • previous state
  • current state
Answer: reset
Q8 | The output of latches will remain in set/reset untill                        
  • the trigger pulse is given to change the state
  • any pulse given to go into previous state
  • they don’t get any pulse more
  • the pulse is edge-triggered
Answer: the trigger pulse is given to change the state
Q9 | What is a trigger pulse?
  • a pulse that starts a cycle of operation
  • a pulse that reverses the cycle of operation
  • a pulse that prevents a cycle of operation
  • a pulse that enhances a cycle of operation
Answer: a pulse that starts a cycle of operation
Q10 | A latch is an example of a                        
  • monostable multivibrator
  • astable multivibrator
  • bistable multivibrator
  • 555 timer
Answer: bistable multivibrator
Q11 | Latch is a device with                        
  • one stable state
  • two stable state
  • three stable state
  • infinite stable states
Answer: two stable state
Q12 | Why latches are called a memory devices?
  • it has capability to stare 8 bits of data
  • it has internal memory of 4 bit
  • it can store one bit of data
  • it can store infinite amount of data
Answer: it can store one bit of data
Q13 | Two stable states of latches are                        
  • astable & monostable
  • low input & high output
  • high output & low output
  • low output & high input
Answer: high output & low output
Q14 | How many types of latches are __
  • 4
  • 3
  • 2
  • 5
Answer: 4
Q15 | The full form of SR is                        
  • system rated
  • set reset
  • set ready
  • set rated
Answer: set reset
Q16 | The SR latch consists of                        
  • 1 input
  • 2 inputs
  • 3 inputs
  • 4 inputs
Answer: 2 inputs
Q17 | The outputs of SR latch are                        
  • x and y
  • a and b
  • s and r
  • q and q’
Answer: q and q’
Q18 | The first step of analysis procedure of SR latch is to                        
  • label inputs
  • label outputs
  • label states
  • label tables
Answer: label outputs
Q19 | The inputs of SR latch are                        
  • x and y
  • a and b
  • s and r
  • j and k
Answer: s and r
Q20 | When a high is applied to the Set line of an SR latch, then                        
  • q output goes high
  • q’ output goes high
  • q output goes low
  • both q and q’ go high
Answer: q output goes high
Q21 | When both inputs of SR latches are low, the latch                        
  • q output goes high
  • q’ output goes high
  • it remains in its previously set or reset state
  • it goes to its next set or reset state
Answer: it remains in its previously set or reset state
Q22 | When both inputs of SR latches are high, the latch goes                        
  • unstable
  • stable
  • metastable
  • bistable
Answer: metastable
Q23 | The full form of MOS is                        
  • metal oxide semiconductor
  • metal oxygen semiconductor
  • metallic oxide semiconductor
  • metallic oxygen semiconductor
Answer: metal oxide semiconductor
Q24 | What are the types of MOSFET devices available?
  • p-type enhancement type mosfet
  • n-type enhancement type mosfet
  • depletion type mosfet
  • all of the mentioned
Answer: all of the mentioned
Q25 | Which insulating layer used in the fabrication of MOSFET?
  • aluminium oxide
  • silicon nitride
  • silicon dioxide
  • aluminium nitrate
Answer: silicon dioxide
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