Code Converts and Multiplexers Questions and Answers
Code Converters and Multiplexers are crucial topics in Digital Electronics aptitude questions and answers for exams like GATE, ISRO, DRDO, and BARC. These devices form the backbone of digital systems, helping in signal conversion and data routing. A code converter transforms one type of binary code to another, such as BCD to Gray or binary to excess-3. A multiplexer, on the other hand, selects one of many input signals and forwards it to a single output line. Understanding these concepts strengthens logical and numerical reasoning, especially for electronics and communication aspirants. Explore detailed aptitude questions with solutions PDF and explanations to boost your preparation and master problem-solving in digital circuits effectively.
Code Converts and Multiplexers
1. In a Gray code, each number is 3 greater than the binary representation of that number.
- TRUE
- FALSE
2. Use the weighting factors to convert the following BCD numbers to binary. 0101 0011 0010 0110 1000
- 01010011 001001101000
- 11010100 100001100000
- 110101 100001100
- 101011 001100001
3. Which digital system translates coded characters into a more useful form?
- encoder
- display
- counter
- decoder
4. From the following list of input conditions, determine the state of the five output leads on a 74148 octal-to-binary encoder. I0 = 1 I3 = 1 I6 = 1 I1 = 1 I4 = 0 I7 = 1 I2 = 1 I5 = 1 EI = 0
- GS = L, A0 = L, A1 = L, A2 = H, EO = H
- GS = L, A0 = H, A1 = L, A2 = L, EO = H
- GS = L, A0 = L, A1 = H, A2 = L, EO = H
- GS = L, A0 = H, A1 = H, A2 = L, EO = H
5. What is the function of an enable input on a multiplexer chip?
- to apply Vcc
- to connect ground
- to active the entire chip
- to active one half of the chip
6. The expansion inputs to a comparator are used for expansion to a(n):
- 4-bit system
- 8-bit system
- BCD system
- counter system
7. What do the mathematical symbols A < b and A > B mean?
- A < B means A is greater than B. A > B means A is less than B.
- A > B means A is less than B. A < B means A is greater than B.
- A < B means A is less than B. A > B means A is greater than B.
8. A basic multiplexer principle can be demonstrated through the use of a:
- single-pole relay
- DPDT switch
- rotary switch
- linear stepper
10. A principle regarding most IC decoders is that when the correct input is present, the related output will switch:
- active-HIGH
- to a high impedance
- to an open
- active-LOW