# Electronics - Number Systems and Codes

### Exercise :: Number Systems and Codes - Filling the Blanks

1.

Digital electronics is based on the _________ numbering system.

 A. decimal B. hexadecimal C. binary D. octal

Explanation:

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2.

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

Explanation:

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3.

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

Explanation:

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4.

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

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

Explanation:

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5.

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