Code Converters and Multiplexers problems
- 1. Which digital system translates coded characters into a more useful form?
Options- A. encoder
- B. display
- C. counter
- D. decoder Discuss
Correct Answer: decoder
- 2. A basic multiplexer principle can be demonstrated through the use of a:
Options- A. single-pole relay
- B. DPDT switch
- C. rotary switch
- D. linear stepper Discuss
Correct Answer: rotary switch
- 3. Why can a CMOS IC be used as both a multiplexer and a demultiplexer?
Options- A. It cannot be used as both.
- B. CMOS uses bidirectional switches. Discuss
Correct Answer: CMOS uses bidirectional switches.
- 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
Options- A. GS = L, A0 = L, A1 = L, A2 = H, EO = H
- B. GS = L, A0 = H, A1 = L, A2 = L, EO = H
- C. GS = L, A0 = L, A1 = H, A2 = L, EO = H
- D. GS = L, A0 = H, A1 = H, A2 = L, EO = H Discuss
Correct Answer: GS = L, A0 = H, A1 = H, A2 = L, EO = H
- 5. Use the weighting factors to convert the following BCD numbers to binary. 0101 0011 0010 0110 1000
Options- A. 01010011 001001101000
- B. 11010100 100001100000
- C. 110101 100001100
- D. 101011 001100001 Discuss
Correct Answer: 110101 100001100
- 6. A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):
Options- A. BCD matrix
- B. display driver
- C. encoder
- D. decoder Discuss
Correct Answer: encoder
- 7. How many select lines would be required for an 8-line-to-1-line multiplexer?
Options- A. 2
- B. 3
- C. 4
- D. 8 Discuss
Correct Answer: 3
- 8. What control signals may be necessary to operate a 1-line-to-16 line decoder?
Options- A. flasher circuit control signal
- B. a LOW on all gate enable inputs
- C. input from a hexadecimal counter
- D. a HIGH on all gate enable circuits Discuss
Correct Answer: a LOW on all gate enable inputs
- 9. In a BCD-to-seven-segment converter, why must a code converter be utilized?
Options- A. to convert the 4-bit BCD into 7-bit code
- B. to convert the 4-bit BCD into 10-bit code
- C. to convert the 4-bit BCD into Gray code
- D. No conversion is necessary. Discuss
Correct Answer: to convert the 4-bit BCD into 7-bit code
- 10. When two or more inputs are active simultaneously, the process is called:
Options- A. first-in, first-out processing
- B. priority encoding
- C. ripple blanking
- D. first-in, first-out processing or priority encoding Discuss
Correct Answer: priority encoding
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