Deck 8: Registers, Shift Registers, and Adders

Question 1

Full subtractor is used to perform subtraction of                        

A)2 bits
B)3 bits
C)4 bits
D)8 bits

Answer 1

3 bits

Question 2

The full subtractor can be implemented using                        

A)two xor and an or gates
B)two half subtractors and an or gate
C)two multiplexers and an and gate
D)two comparators and an and gate

Answer 2

two half subtractors and an or gate

Question 3

The output of a subtractor is given by (if A, B and X are the inputs).

A)a and b xor x
B)a xor b xor x
C)a or b nor x
D)a nor b xor x

Answer 3

a xor b xor x

Question 4

The output of a full subtractor is same as                          

A)half adder
B)full adder
C)half subtractor
D)decoder

Question 5

A register is defined as                        

A)the group of latches for storing one bit of information
B)the group of latches for storing n-bit of information
C)the group of flip-flops suitable for storing one bit of information
D)the group of flip-flops suitable for storing binary information

Question 6

The register is a type of                        

A)sequential circuit
B)combinational circuit
C)cpu
D)latches

Question 7

How many types of registers are?

A)2
B)3
C)4
D)5

Question 8

The main difference between a register and a counter is                        

A)a register has no specific sequence of states
B)a counter has no specific sequence of states
C)a register has capability to store one bit of information but counter has n-bit
D)a register counts data

Question 9

In D register, 'D' stands for  

A)delay
B)decrement
C)data
D)decay

Question 10

Registers capable of shifting in one direction is                        

A)universal shift register
B)unidirectional shift register
C)unipolar shift register
D)unique shift register

Question 11

A register that is used to store binary information is called                        

A)data register
B)binary register
C)shift register
D)d - register

Question 12

A shift register is defined as                        

A)the register capable of shifting information to another register
B)the register capable of shifting information either to the right or to the left
C)the register capable of shifting information to the right only
D)the register capable of shifting information to the left only

Question 13

How many methods of shifting of data are available?

A)2
B)3
C)4
D)5

Question 14

In serial shifting method, data shifting occurs                          

A)one bit at a time
B)simultaneously
C)two bit at a time
D)four bit at a time

Question 15

What is a recirculating register?

A)serial out connected to serial in
B)all q outputs connected together
C)a register that can be used over again
D)parallel out connected to parallel in

Question 16

When is it important to use a three-state buffer?

A)when two or more outputs are connected to the same input
B)when all outputs are normally high
C)when all outputs are normally low
D)when two or more outputs are connected to two or more inputs

Question 17

After two clock pulses, the register contains

A)10111000
B)10110111
C)11110000
D)11111100

Question 18

How much storage capacity does each stage in a shift register represent?

A)one bit
B)two bits
C)four bits
D)eight bits

Question 19

The decimal number system represents the decimal number in the form of

A)hexadecimal
B)binary coded
C)octal
D)decimal

Question 20

29 input circuit will have total of                          

A)32 entries
B)128 entries
C)256 entries
D)512 entries

Question 21

BCD adder can be constructed with 3 IC packages each of                          

A)2 bits
B)3 bits
C)4 bits
D)5 bits

Question 22

The output sum of two decimal digits can be represented in                          

A)gray code
B)excess-3
C)bcd
D)hexadecimal

Question 23

The addition of two decimal digits in BCD can be done through                          

A)bcd adder
B)full adder
C)ripple carry adder
D)carry look ahead

Question 24

3 bits full adder contains                          

A)3 combinational inputs
B)4 combinational inputs
C)6 combinational inputs
D)8 combinational inputs

Question 25

The simplified expression of full adder carry is                          

A)c = xy+xz+yz
B)c = xy+xz
C)c = xy+yz
D)c = x+y+z