Digital Logic Circuits Mcqs
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2. The EXCLUSIVE NOR gate is equivalent to which gate followed by an inverter ?
OR
AND
NAND
XOR
3. A one-to-four line demultiplexer is to be implemented using a memory. How many bits must each word have ?
1 bit
2 bits
4 bits
8 bits
4. What logic function is produced by adding an inverter to the output of an AND gate ?
NAND
NOR
XOR
OR
5. Which of the following gates is known as coincidence detector ?
AND gate
OR gate
NOT gate
NAND gate
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6. Which table shows the logical state of a digital circuit output for every possible combination of logical states in the inputs ?
Function table
Truth table
Routing table
ASCII table
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7. A positive AND gate is also a negative
NAND gate
NOR gate
AND gate
OR gate
8. A demultiplexer is used to
Route the data from single input to one of many outputs
Perform serial to parallel conversion
Both a & b
Select data from several inputs and route it to single output
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9. An OR gate can be imagined as
Switches connected in series
Switches connected in parallel
MOS transistors connected in series
None of these
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10. Which combination of gates does not allow the implementation of an arbitrary Boolean function?
OR gates and AND gates only
OR gates and exclusive OR gate only
OR gates and NOT gates only
NAND gates only
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11. How many full adders are required to construct an m-bit parallel adder ?
M/2
M-1
M
M+1
12. Parallel adders are
Combinational logic circuits
Sequential logic circuits
Both a and b
None of these
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13. The most efficient method followed by computers to multiply two unsigned numbers is _______ .
Booth algorithm
Bit pair recording of multipliers
Restoring algorithm
Non restoring algorithm
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14. For the addition of large integers most of the systems make use of ______ .
Fast adders
Full adders
Carry look-ahead adders
None of the above
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15. In a normal n-bit adder , to find out if an overflow as occurred we make use of _____ .
And gate
Nand gate
Nor gate
Xor gate
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