Digital Electronics Question Bank

8. What are the different types of number complements?
i) r‟s Complement(1‟s complement)
ii) (r-1)‟s Complement (2‟s complement).
iii) 9‟s complement
iv) 10‟s complement
9. Why complementing a number representation is needed?
Complementing a number becomes as in digital computer for simplifying the
subtraction operation and for logical manipulation complements are used.
10. How to represent a positive and negative sign in computers?
Positive (+) sign by 0
Negative (-) sign by 1.
11. What is meant by Digital Systems?
An electronic system consisting of digital circuits/or devices. A digital system is
a data technology that uses discrete (discontinuous) values. The analog (non-digital)
systems use a continuous range of values to represent information. Although digital
representations are discrete, they can be used to carry either discrete information, such as
numbers, letters or other individual symbols, or approximations of continuous
information, such as sounds, images, and other measurements of continuous systems.
12. Define Gray Code?
A code in which only one bit changes between successive numbers. This code is
used extensively for shaft encoders because of this property. It is not a weighted code.
The gray code is a reflected code.
13. What is code?
A system of representation numeric, alphapets or special characters in a binary
form for processing and transmission using digital principles. Codes are used for error
detection and error correction in digital systems.
14. Define Positive Logic.
When high voltage or more positive voltage level is associated with binary „1‟and
While the low or less positive level is associated with binary „0‟ then the system adhering
to this is called positive logic.