UNIT II

The output is dependent only on present input?

• Combinational Circuits

• Analog circuits

• Flip flop

• Sequential circuits

The combination of two half adders is _____________

• Comparator

• Half adder

• Full adder

• Smitt trigger

The device shown here is most likely a ________

• Comparator
  

• Multiplexer
  

• Inverter
  

• Demultiplexer

The gates required to build a half adder are __________

• EX-OR gate and NOR gate

• EX-OR gate and OR gate

• EX-OR gate and AND gate

• EX-NOR gate and AND gate

A full-adder has a Cin = 0. What are the sum ( S) and the carry (Cout) when A = 1 and B = 1?

• S= 0, Cout = 0

• S= 0, Cout = 1

• S= 1, Cout = 0

• S= 1, Cout = 1

The binary numbers A = 1100 and B = 1001 are applied to the inputs of a comparator.

What are the output levels?

• A > B = 1, A < B = 0, A < B = 1

• A > B = 0, A < B = 1, A = B = 0

• A > B = 1, A < B = 0, A = B = 0

• A > B = 0, A < B = 1, A = B = 1

How many data select lines are required for selecting eight inputs?

• 4

• 3

• 2

• 1

How many inputs must a full-adder have?

• 2

• 3

• 4

• 5

If the number of n selected input lines is equal to 2^m then it requires _____ select

lines

• 2

• m

• n

• 2n

How many select lines would be required for an 8-line-to-1-line multiplexer?

• 2

• 4

• 8

• 3