Digital Electronics And Logic Design Set 13
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This set of Digital Electronics and Logic Design Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics And Logic Design Set 13
Q1 | A combinational logic circuit which sends data coming from a single source to two or more separate destinations is
- decoder
- encoder
- multiplexer
- demultiple xer
Q2 | Data can be changed from special code to temporal code by using
- shift registers
- counters
- combination al circuits
- a/d converters
Q3 | Odd parity of word can beconveniently tested by
- or gate
- and gate
- nor gate
- xor gate
Q4 | Which one of the following will give the sum of full adders as output ?
- three point majority circuit
- three bit parity checker
- three bit comparator
- three bit counter
Q5 | The number of full and half-adders required to add 16-bit numbers is
- 8 half-adders,8 full-adders
- 1 half-adder,15 full- adders
- 16 half-adders, 0 full- adders
- 4 half-adders, 12 full-adders
Q6 | A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?
- 1 bit
- 2 bits
- 4 bits
- 8 bits
Q7 | What logic function is produced by adding an inverter to the output of an AND gate ?
- nand
- nor
- xor
- or
Q8 | A demultiplexer is used to
- route the data from single input to one of many outputs
- select data from several inputs and route it to single output
- perform serial to parallel conversion
- all of these
Q9 | How many full adders are required to construct an m-bit parallel adder ?
- m/2
- m-1
- m
- m+1
Q10 | Parallel adders are
- combinational logic circuits
- sequential logic circuits
- both (a) and (b)
- none of these
Q11 | The digital multiplexer is basically a combination logic circuit to perform the operation
- and-and
- or-or
- and-or
- or-and
Q12 | How many lines the truth table for a four-input NOR gate would contain to cover all possible input combinations ?
- 4
- 8
- 12
- 16
Q13 | How many truth tables can be made from one function table ?
- 1
- 2
- 3
- any no
Q14 | A comparison between serial and parallel adder reveals that serial order
- is slower
- is faster
- operates at the same speed as parallel adder
- is more complicate d
Q15 | What is the largest number of data inputs which a data selector with two control inputs can have ?
- 2
- 4
- 6
- 8
Q16 | If a logic gates has four inputs, then total number of possible input combinations is
- 4
- 8
- 16
- 32
Q17 | If a logic gates has four inputs, then total number of possible input combinations is
- input combination at the time
- input combination and the previous output
- nput combination at that time and the previous input combination
- present output and the previous output
Q18 | A combinational logic circuit which generates a particular binary word or number is
- decoder
- multiplexer
- encoder
- demultiple xer
Q19 | Which of the following circuit can be used as parallel to serial converter ?
- multiplexer
- demultiplexe r
- decoder
- digital counter
Q20 | In which of the following adder circuits, the carry look ripple delay is eliminated ?
- half adder
- full adder
- parallel adder
- carry- look- ahead adder
Q21 | Adders
- adds 2 bits
- is called so because a full adder involves two half-adders
- needs two input and generates two output
- all of these
Q22 | Excess-3 code is known as
- weighted code
- cyclic redundancy code
- self- complementi ng code
- algebraic code.
Q23 | The number of control lines for 32 to 1 multiplexer is
- 4
- 16
- 5
- 6
Q24 | The selector inputs to an arithmetic-logic unit (ALU) determine the:
- selection of
- arithmetic
- data word
- clock
Q25 | What are the two types of basic adder circuits?
- half adder and
- half adder
- asynchronou
- one\s