Digital Electronics Set 7
On This Page
This set of Digital Electronics Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics Set 7
Q1 | Full subtractor is used to perform subtraction of
- 2 bits
- 3 bits
- 4 bits
- 8 bits
Q2 | The output of a full subtractor is same as
- half adder
- full adder
- half subtractor
- decoder
Q3 | The full subtractor can be implemented using
- two xor and an or gates
- two half subtractors and an or gate
- two multiplexers and an and gate
- two comparators and an and gate
Q4 | Why XOR gate is called an inverter?
- because of the same input
- because of the same output
- it behaves like a not gate
- it behaves like a and gate
Q5 | Controlled buffers can be useful
- to control the circuit’s output into the bus
- in comparison of component’s output with its input
- in increasing the output from its low input
- all of the mentioned
Q6 | A logic circuit that provides a HIGH output for both inputs HIGH or both inputs LOW is
- ex-nor gate
- or gate
- ex-or gate
- nand gate
Q7 | What is the first thing you will need if you are going to use a macro-function?
- a complicated design project
- an experienced design engineer
- good documentation
- experience in hdl
Q8 | What is the major difference between half- adders and full-adders?
- full-adders are made up of two half-adders
- full adders can handle double-digit numbers
- full adders have a carry input capability
- half adders can handle only single-digit numbers
Q9 | The binary subtraction of 0 – 0 = ?
- difference = 0, borrow = 0
- difference = 1, borrow = 0
- difference = 1, borrow = 1
- difference = 0, borrow = 1
Q10 | How many basic binary subtraction operations are possible?
- 1
- 4
- 3
- 2
Q11 | When performing subtraction by addition in the 2’s-complement system
- the minuend and the subtrahend are both changed to the 2’s-complement
- the minuend is changed to 2’s- complement and the subtrahend is left in its original form
- the minuend is left in its original form and the subtrahend is changed to its 2’s- complement
- the minuend and subtrahend are both left in their original form
Q12 | What are the two types of basic adder circuits?
- sum and carry
- half-adder and full-adder
- asynchronous and synchronous
- one and two’s-complement
Q13 | Which of the following is correct for full adders?
- full adders have the capability of directly adding decimal numbers
- full adders are used to make half adders
- full adders are limited to two inputs since there are only two binary digits
- in a parallel full adder, the first stage may be a half adder
Q14 | The selector inputs to an arithmetic/logic unit (ALU) determine the
- selection of the ic
- arithmetic or logic function
- data word selection
- clock frequency to be used
Q15 | The inverter can be produced with how many NAND gates?
- 2
- 1
- 3
- 4
Q16 | What are carry generate combinations?
- if all the input are same then a carry is generated
- if all of the output are independent of the inputs
- if all of the input are dependent on the output
- if all of the output are dependent on the input
Q17 | How many shift registers are used in a 4 bit serial adder?
- 4
- 3
- 2
- 5
Q18 | A D flip-flop is used in a 4-bit serial adder, why?
- it is used to invert the input of the full adder
- it is used to store the output of the full adder
- it is used to store the carry output of the full adder
- it is used to store the sum output of the full adder
Q19 | What is ripple carry adder?
- the carry output of the lower order stage is connected to the carry input of the next higher order stage
- the carry input of the lower order stage is connected to the carry output of the next higher order stage
- the carry output of the higher order stage is connected to the carry input of the next lower order stage
- the carry input of the higher order stage is connected to the carry output of the lower order stage
Q20 | If minuend = 0, subtrahend = 1 and borrow input = 1 in a full subtractor then the borrow output will be
- 0
- 1
- floating
- high impedance
Q21 | The decimal number system represents the decimal number in the form of
- hexadecimal
- binary coded
- octal
- decimal
Q22 | 29 input circuit will have total of
- 32 entries
- 128 entries
- 256 entries
- 512 entries
Q23 | BCD adder can be constructed with 3 IC packages each of
- 2 bits
- 3 bits
- 4 bits
- 5 bits
Q24 | The output sum of two decimal digits can be represented in
- gray code
- excess-3
- bcd
- hexadecimal
Q25 | The addition of two decimal digits in BCD can be done through
- bcd adder
- full adder
- ripple carry adder
- carry look ahead