digital

In a ripple counter

a. whenever a flip flop sets to 1, the next higher FF toggles

b. whenever a flip flop sets to 0, the next higher FF remains unchanged

c. whenever a flip flop sets to 1, the next higher FF faces race condition

• whenever a flip flop sets to 1, the next higher FF toggles

• whenever a flip flop sets to 0, the next higher FF remains unchanged

• whenever a flip flop sets to 1, the next higher FF faces race condition

• whenever a flip flop sets to 0, the next higher FF faces race condition

Ring and Johnson counters are ____________

• Asynchronous counters

• synchronous counters

• True binary counters

• Synchronous and true binary counters

The above circuit is a

• AND

• NOR

• NAND

• OR

Which gate gives a high output only when all its inputs are low

• NAND

• NOR

• OR

• AND

The minimum number of 2- input NAND gates required to create a 2-input XOR gate is

• 6

• 7

• 4

• 3

Exclusive-OR (XOR) logic gates can be constructed from

………..logic

 gates.

• OR gates only

• AND gates and NOT gates

• OR gates and NOT gates

• AND gates, OR gates, and NOT gates

Which of the following circuit has its output dependent only on its present inputs

• Analog circuits

• Flipflops

• Combinational circuits

• Sequential circuits

3 bits full adder contains ________

• 3 combinational inputs

• 4 combinational inputs

• 6 combinational inputs

• 8 combinational inputs

How is an encoder different from a decoder?

• The output of an encoder is a binary code for 1-of-N input

• The output of a decoder is a binary code for 1-of-N input

• The output of an encoder is a binary code for N-of-1 output

• The output of a decoder is a binary code for N-of-1 output

For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is ___________

• The same as if the carry-in is tied LOW since the least significant carry-in is ignored

• That carry-out will always be HIGH

• A one will be added to the final result

• The carry-out is ignored