# Digital Logic And Logic Families-a2

Approved & Edited by ProProfs Editorial Team
The editorial team at ProProfs Quizzes consists of a select group of subject experts, trivia writers, and quiz masters who have authored over 10,000 quizzes taken by more than 100 million users. This team includes our in-house seasoned quiz moderators and subject matter experts. Our editorial experts, spread across the world, are rigorously trained using our comprehensive guidelines to ensure that you receive the highest quality quizzes.
| By Pratiksha Patil
P
Pratiksha Patil
Community Contributor
Quizzes Created: 2 | Total Attempts: 222
Questions: 9 | Attempts: 136

Settings

Digital logic and logic families: Digital signals, combinational and sequential logic circuits, clock signals, Boolean algebra and logic gates. Integrated circuits and logic families: Logic Levels, Noise Immunity, Fan Out, Propagation Delay, TTL logic family CMOS Logic family, comparison with TTL family Flip flops: Set Reset(SR),Trigger(T), clocked F/Fs; Registers, decoders and encoders, Multiplexer and Demultiplexer, applications
04

• 1.

• 2.

### According to boolean law: A + 1 = ?

• A.

1

• B.

A

• C.

0

• D.

A'

A. 1
Explanation
According to boolean law, when a variable A is ORed with 1, the result will always be 1. This is because in boolean algebra, 1 represents a true value and any variable ORed with true will always result in true. Therefore, the correct answer is 1.

Rate this question:

• 3.

### VLSI refers to digital ICs having

• A.

More than 1000 gates

• B.

More than 100 gates

• C.

More than 1000 but less than 9999

• D.

More than 100 but less than 999

C. More than 1000 but less than 9999
Explanation
VLSI refers to Very Large Scale Integration, which means integrating a large number of components or gates onto a single chip. The correct answer states that VLSI refers to digital ICs having more than 1000 but less than 9999 gates. This range indicates that VLSI chips are capable of integrating a significant number of gates, making them suitable for complex digital circuits and applications.

Rate this question:

• 4.

### Whose operations are more faster among the following?

• A.

Combinational circuits

• B.

Sequential circuits

• C.

Latches

• D.

Flip-flops

A. Combinational circuits
Explanation
Combinational circuits are faster than sequential circuits, latches, and flip-flops because they do not have any memory elements or feedback loops. Combinational circuits perform operations based solely on the current input values, without considering any previous states or inputs. This lack of memory allows them to have faster propagation delays and shorter gate delays compared to sequential circuits, latches, and flip-flops, which need to store and process information over time. Therefore, in terms of speed, combinational circuits are the fastest among the given options.

Rate this question:

• 5.

### Which is the major functioning responsibility of the multiplexing combinational circuit?

• A.

Decoding the binary information

• B.

Generation of all minterms in an output function with OR-gate

• C.

Generation of selected path between multiple sources and a single destination

• D.

All of the Mentioned

C. Generation of selected path between multiple sources and a single destination
Explanation
The major functioning responsibility of a multiplexing combinational circuit is the generation of a selected path between multiple sources and a single destination. This means that the circuit is designed to route or switch data from multiple input sources to a single output destination based on a selection signal. This allows for efficient transmission of data and enables the sharing of resources among multiple sources.

Rate this question:

• 6.

### How many select lines are required for a 1-to-8 demultiplexer? a) 2 b) 3 c) 4 d) 5

• A.

2

• B.

3

• C.

4

• D.

5

B. 3
Explanation
A 1-to-8 demultiplexer takes one input and distributes it to one of the eight outputs based on the select lines. In this case, the correct answer is 3 because three select lines are required to represent 8 possible output combinations. With three select lines, we can have 2^3 = 8 different combinations, allowing us to select any one of the eight outputs.

Rate this question:

• 7.

### The NOR gate output will be high if the two inputs are

• A.

00

• B.

10

• C.

10

• D.

11

A. 00
Explanation
The NOR gate is a logic gate that produces an output of 1 (high) only when both of its inputs are 0 (low). In the given options, the only option where both inputs are 0 is "00". Therefore, the output of the NOR gate will be high for this input combination.

Rate this question:

• 8.

### A single transistor can be used to build which of the following digital logic gates?

• A.

AND gates

• B.

OR gates

• C.

NOT gates

• D.

NAND gates

C. NOT gates
Explanation
A single transistor can be used to build a NOT gate. In a NOT gate, the output is the inverse of the input. By connecting the input to the base of the transistor and the output to the collector, when the input is low, the transistor is turned on and the output is high. Conversely, when the input is high, the transistor is turned off and the output is low. This behavior of the transistor allows it to function as a NOT gate.

Rate this question:

• 9.

### Digital data refers to information that is

• A.

Continuous

• B.

Discrete

• C.

Bits

• D.

Bytes

B. Discrete
Explanation
Digital data refers to information that is discrete. This means that it is represented by distinct and separate values, rather than being continuous or analog. Discrete data is typically represented in binary format using bits and bytes, where each bit can have a value of 0 or 1. This allows for precise and accurate representation of information, making it suitable for digital storage, transmission, and processing.

Rate this question:

Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

• Current Version
• Mar 22, 2023
Quiz Edited by
ProProfs Editorial Team
• Mar 06, 2019
Quiz Created by
Pratiksha Patil

Related Topics