Question 1

The carry output of a half- adder can be expressed as _________.

Accepted Answer

A)  Cout = A + B 
B)  Cout = AB 
C)  ?   
D)  none of these 
A)  Cout = A + B 
B)  Cout = AB 
C)  ?   
D)  none of these B

Question 2

The circuit below can be used as a(n) 	_________.

Accepted Answer

A)  dual 4- line multiplexer 
B)  4- bit comparator 
C)  8- bit comparator 
D)  4- bit half- adder 
A)  dual 4- line multiplexer 
B)  4- bit comparator 
C)  8- bit comparator 
D)  4- bit half- adder B

Question 3

A BCD- to- decimal decoder has________ data input lines and ________ data output lines.

Accepted Answer

A)  10,10 
B)  1,10 
C)  4, 10 
D)  7,9 
A)  10,10 
B)  1,10 
C)  4, 10 
D)  7,9 C

Question 4

In binary addition, 0 + 0 = 00.

Accepted Answer

A) True 
 B)False

Question 5

A half- adder has no carry- in bit.

Accepted Answer

A) True 
 B)False

Question 6

Which statement below best describes the function of a decoder?

Accepted Answer

A)  A decoder will convert a decimal number into the proper binary equivalent. 
B)  Decoders are used to prevent improper operation of digital systems. 
C)  A decoder will convert a binary number into a specific output representing a particular character or digit. 
D)  Decoders are special ICs that are used to make it possible for one brand of computer to talk to another. 
A)  A decoder will convert a decimal number into the proper binary equivalent. 
B)  Decoders are used to prevent improper operation of digital systems. 
C)  A decoder will convert a binary number into a specific output representing a particular character or digit. 
D)  Decoders are special ICs that are used to make it possible for one brand of computer to talk to another.

Question 7

-The boolean expression for the decoder in Figure 6- 3 is ________.

Accepted Answer

A)    
B)  X = ABCD 
C)    
D)  None of these 
A)    
B)  X = ABCD 
C)    
D)  None of these

Question 8

The expression ?   describes _______.

Accepted Answer

A)  the sum output of a full- adder 
B)  the carry output of a half- adder 
C)  the carry output of a full- adder 
D)  the sum output of a half- adder 
A)  the sum output of a full- adder 
B)  the carry output of a half- adder 
C)  the carry output of a full- adder 
D)  the sum output of a half- adder

Question 9

‪  
-Refer to the symbol in Figure 6- 1. When A = 0 and B = 1, _______..

Accepted Answer

A)  ?= 1, Cout = 1 
B)  ? = 1, Cout = 0 
C)  ? = 0, Cout = 1 
D)  ? = 0, Cout = 0 
A)  ?= 1, Cout = 1 
B)  ? = 1, Cout = 0 
C)  ? = 0, Cout = 1 
D)  ? = 0, Cout = 0

Question 10

A demultiplexer has multiple inputs and a single output.

Accepted Answer

A) True 
 B)False

Question 11

In binary addition, 1 + 0 = 1.

Accepted Answer

A) True 
 B)False

Question 12

What is the major difference between half- adders and full- adders?

Accepted Answer

A)  Full- adders are made up of two half- adders. 
B)  Half- adders can only handle single digit numbers. 
C)  Full- adders can handle double digit numbers. 
D)  Full- adders have a carry input capability. 
A)  Full- adders are made up of two half- adders. 
B)  Half- adders can only handle single digit numbers. 
C)  Full- adders can handle double digit numbers. 
D)  Full- adders have a carry input capability.

Question 13

A BCD- to- decimal decoder can be classified as a 4- line to 10- line decoder.

Accepted Answer

A) True 
 B)False

Question 14

The symbol below most likely represents a ________.

Accepted Answer

A)  demultiplexer 
B)  multiplexer 
C)  comparator 
D)  full- adder 
A)  demultiplexer 
B)  multiplexer 
C)  comparator 
D)  full- adder

Question 15

What is one advantage of the look- ahead- carry adder?

Accepted Answer

A)  It is slower than the ripple- carry adder. 
B)  It is faster than a ripple- carry adder. 
C)  It is easier to implement logically than a full- adder. 
D)  It requires advance knowledge of the final answer. 
A)  It is slower than the ripple- carry adder. 
B)  It is faster than a ripple- carry adder. 
C)  It is easier to implement logically than a full- adder. 
D)  It requires advance knowledge of the final answer.

Question 16

A multiplexer has multiple inputs and a single output.

Accepted Answer

A) True 
 B)False

Question 17

‪  
-Referring to the symbol in Figure 6- 1, which combination of outputs should never occur?

Accepted Answer

A)  ? = 0, Cout = 0 
B)  ? = 1, Cout = 0 
C)  ? = 0, Cout = 1 
D)  ?= 1, Cout = 1 
A)  ? = 0, Cout = 0 
B)  ? = 1, Cout = 0 
C)  ? = 0, Cout = 1 
D)  ?= 1, Cout = 1

Question 18

Full- adders do not provide for a carry input or a carry output.

Accepted Answer

A) True 
 B)False

Question 19

Adders with greater bit capacities can be constructed by connecting 2- bit adders in parallel.

Accepted Answer

A) True 
 B)False

Question 20

Full- adders can be used as a BCD- to- binary converters.

Accepted Answer

A) True 
 B)False

The carry output of a half- adder can be expressed as _________.

The circuit below can be used as a(n) _________.

A BCD- to- decimal decoder has data input lines and data output lines.

In binary addition, 0 + 0 = 00.

A half- adder has no carry- in bit.

Which statement below best describes the function of a decoder?

-The boolean expression for the decoder in Figure 6- 3 is ________.

The expression ? describes _______.

‪ -Refer to the symbol in Figure 6- 1. When A = 0 and B = 1, _______..

A demultiplexer has multiple inputs and a single output.

In binary addition, 1 + 0 = 1.

What is the major difference between half- adders and full- adders?

A BCD- to- decimal decoder can be classified as a 4- line to 10- line decoder.

The symbol below most likely represents a ________.

What is one advantage of the look- ahead- carry adder?

A multiplexer has multiple inputs and a single output.

‪ -Referring to the symbol in Figure 6- 1, which combination of outputs should never occur?

Full- adders do not provide for a carry input or a carry output.

Adders with greater bit capacities can be constructed by connecting 2- bit adders in parallel.

Full- adders can be used as a BCD- to- binary converters.

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Latches, Flip-Flops, and Timers

Shift Registers

Counters

Programmable Logic

Data Storage

Signal Conversion and Processing

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters

Exam 6: Functions of Combinational Logic

The carry output of a half- adder can be expressed as _________.

The circuit below can be used as a(n) _________.

A BCD- to- decimal decoder has________ data input lines and ________ data output lines.

In binary addition, 0 + 0 = 00.

A half- adder has no carry- in bit.

Which statement below best describes the function of a decoder?

-The boolean expression for the decoder in Figure 6- 3 is ________.

The expression ? describes _______.

‪ -Refer to the symbol in Figure 6- 1. When A = 0 and B = 1, _______..

A demultiplexer has multiple inputs and a single output.

In binary addition, 1 + 0 = 1.

What is the major difference between half- adders and full- adders?

A BCD- to- decimal decoder can be classified as a 4- line to 10- line decoder.

The symbol below most likely represents a ________.

What is one advantage of the look- ahead- carry adder?

A multiplexer has multiple inputs and a single output.

‪ -Referring to the symbol in Figure 6- 1, which combination of outputs should never occur?

Full- adders do not provide for a carry input or a carry output.

Adders with greater bit capacities can be constructed by connecting 2- bit adders in parallel.

Full- adders can be used as a BCD- to- binary converters.

Introductory Concepts

Number Systems, Operations, and Codes

Logic Gates

Boolean Algebra and Logic Simplification

Combinational Logic Analysis

Latches, Flip-Flops, and Timers

Shift Registers

Counters

Programmable Logic

Data Storage

Signal Conversion and Processing

Data Transmission

Data Processing and Control

Integrated Circuit Technologies

Filters

A BCD- to- decimal decoder has data input lines and data output lines.