Code Converts and Multiplexers Questions and Answers

Practice Mode
Showing 10 of 48 questions
Q21
Why is a demultiplexer called a data distributor?
  • A The input will be distributed to one of the outputs.
  • B One of the inputs will be selected for the output.
  • C The output will be distributed to one of the inputs.
Answer: Option A
Q22
What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?
  • A S0 = 0, S1 = 1, S2 = 0
  • B S0 = 0, S1 = 0, S2 = 1
  • C S0 = 1, S1 = 1, S2 = 0
  • D S0 = 1, S1 = 0, S2 = 1
Answer: Option D
Q23
One way to convert BCD to binary using the hardware approach is:
  • A with MSI IC circuits
  • B with a keyboard encoder
  • C with an ALU
  • D UART
Answer: Option A
Q24
A microcontroller differs from a microprocessor in that it has several ________ ports and ________ built into its architecture, making it better suited for ________ applications.
  • A communication, PROMs, control
  • B parallel, logic gates, processing
  • C input/output, memory, control
  • D data, memory, decoding
Answer: Option C
Q25
How is an encoder different from a decoder?
  • A The output of an encoder is a binary code for 1-of-N input.
  • B The output of a decoder is a binary code for 1-of-N input.
Answer: Option A
Q26
Why is the Gray code more practical to use when coding the position of a rotating shaft?
  • A All digits change between counts.
  • B Two digits change between counts.
  • C Only one digit changes between counts.
Answer: Option C
Q27
For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs? A0 = 0    B0 = 1    IA < B = 0 A1 = 1    B1 = 0    IA = B = 1 A2 = 1    B2 = 0    IA > B = 0 A3 = 0    B3 = 0    
  • A A = B = 0, A < B = 0, A > B = 1
  • B A = B = 0, A < B = 1, A > B = 0
  • C A = B = 1, A < B = 0, A > B = 0
  • D A = B = 0, A < B = 0, A > B = 0
Answer: Option A
Q28
When two or more inputs are active simultaneously, the process is called:
  • A first-in, first-out processing
  • B priority encoding
  • C ripple blanking
  • D first-in, first-out processing or priority encoding
Answer: Option B
Q29
A binary code that progresses such that only one bit changes between two successive codes is:
  • A nine's-complement code
  • B 8421 code
  • C excess-3 code
  • D Gray code
Answer: Option D
Q30
Which of the following is not a weighted value positional numbering system:
  • A hexadecimal
  • B binary-coded decimal
  • C binary
  • D octal
Answer: Option B

📚 More from Digital Electronics

← All Topics 🎯 Practice ⏱️ Take Test 🔍 Search
Digital Electronics
Back to Digital Electronics
Other Subjects
Questions and Answers for Competitive Exams Various Entrance Test