Multiple choice questions on digital electronics
Answers
2.In binary number system the first digit (bit) from right to left is called as a. LSB, Least Significant Bit b. MSB, Most Significant Bit c. First Bit d. Last Bit
3.Which of these sets of logic gates are designated as universal gates? a.NOR, NAND. b.XOR, NOR, NAND. c.OR, NOT, AND. d.NOR, NAND, XNOR
Ans. 1.(B)
2.(A)
3.(A)
Answer:
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Explanation:
1. 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
d) Single input gives single output
Answer: a
Explanation: A demultiplexer sends a single input to multiple outputs, depending on the select lines. For one input, the demultiplexer gives several outputs. That is why it is called a data distributor.
2. Most demultiplexers facilitate which type of conversion?
a) Decimal-to-hexadecimal
b) Single input, multiple outputs
c) AC to DC
d) Odd parity to even parity
Answer: b
Explanation: A demultiplexer sends a single input to multiple outputs, depending on the select lines. Demultiplexer converts single input into multiple outputs.
3. In 1-to-4 demultiplexer, how many select lines are required?
a) 2
b) 3
c) 4
d) 5
Answer: a
Explanation: The formula for total no. of outputs is given by 2n, where n is the no. of select lines. Therefore, for 1:4 demultiplexer, 2 select lines are required.
4. In a multiplexer the output depends on its ____________
a) Data inputs
b) Select inputs
c) Select outputs
d) Enable pin
Answer: b
Explanation: A demultiplexer sends a single input to multiple outputs, depending on the select lines. As the select input changes, the output of the multiplexer varies according to that input.
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