Digital Electronics-Code Converts and Multiplexers
Digital Electronics-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
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
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