ESE 2021 Technical Quiz 43 || Combinational Circuits

Attempt now to get your rank among 182 students!

Question 1

What are the output bits S (Sum) and C (Carry) of a Half Adder having inputs A = 1 and B = 1 ?
S C

• A1 1
• B1 0
• C0 1
• D0 0

Question 2

In which of the following adder circuits, the carry look ripple delay is eliminated?

• AHalf adder
• BFull adder
• CParallel adder
• DCarry-look-ahead adder

Question 3

Consider the following statement:
For 3 input variables a, b, c; a Boolean function y=ab+bc+ca represents.
1). a 3-input majority gate
2). a 3-input minority gate
3). carry output of a full adder
4). product circuit for a, b and c.
Which of the above statement are correct?

• A1 and 4 only
• B2 and 3 only
• C1 and 3 only
• D3 and 4 only

Question 4

Consider a multiplexer with X and Y as data inputs and Z as control input. Z = 0 selects input X and Z = 1 selects input Y. What are the connections required to realize the 2- variable Boolean function , without using any additional hardware?

• AR to X, 1 to Y, T to Z
• BT to X, R to Y, T to Z
• CT to X, R to Y, 0 to Z
• DR to X, 0 to Y, T to Z

Question 5

The following switching functions are to be implemented using a decoder.

The minimum configuration of the decoder should be

• A2-to-4 lines
• B3-to-8 lines
• C4-to-16 lines
• D5-to-32 lines

• 182 attempts
• 0 upvotes
• 4 comments