# Number Systems And Codes MCQs

## 3428 is the decimal value for which of the following binary coded decimal (BCD) groupings?

• A. 11010001001000
• B. 11010000101000
• C. 011010010000010
• D. 110100001101010

## A BCD code that represents each digit of a decimal number by a binary number derived by adding 3 to its 4-bit true binary value is _________.

• A. 9's complement code
• B. excess-3 code
• C. 8421 code
• D. gray code

## A binary code that progresses such that only one bit changes between two successive codes is _________.

• A. 9's complement code
• B. excess-3 code
• C. 8421 code
• D. gray code

## A binary number’s value changes most drastically when the ____ is changed.

• A. LSB
• B. duty cycle
• C. MSB
• D. frequency

## Base 10 refers to which number system?

• A. binary coded decimal
• B. decimal
• C. octal

• A. 201
• B. 2001
• C. 20
• D. 210

• A. 125
• B. 12.5
• C. 90.125
• D. 9.125

• A. 5B
• B. 5F
• C. 5A
• D. 5C

## Convert the decimal number 151.75 to binary.

• A. 10000111.11
• B. 11010011.01
• C. 00111100.00
• D. 10010111.11

• A. decimal
• C. binary
• D. octal

## Sample-and-hold circuits in ADCs are designed to:

• A. sample and hold the output of the binary counter during the conversion process
• B. stabilize the ADCs threshold voltage during the conversion process
• C. stabilize the input analog signal during the conversion process
• D. sample and hold the ADC staircase waveform during the conversion process

• A. excess-3
• B. gray
• C. multibit
• D. minival

## The binary coded decimal (BCD) code is a system that represents each of the 10 decimal digits as a(n) ____________.

• A. 4-bit binary code
• B. 8-bit binary code
• C. 16-bit binary code
• D. ASCII code

• A. 8
• B. 4
• C. 1
• D. 2

• A. 1
• B. 2
• C. 3
• D. 4

• A. 191
• B. 1911
• C. 19
• D. 19111

## What is the difference between binary coding and binary coded decimal?

• A. Binary coding is pure binary.
• B. BCD is pure binary.
• C. Binary coding has a decimal format.
• D. BCD has no decimal format.

• A. 327.375
• B. 12166
• C. 1388
• D. 1476