Combinational Circuits

Question 41

If half adders and full adders are implemented using gates, then for the addition of two 17 bit numbers (using minimum gates) the number of half adders and full adders required will be

• 0, 17
• 16, 1
• 1, 16
• 8, 8

Question 42

Minimum number of multiplexers required to realize the following function,f = A\'B\'C + A\'B\'C\' Assume that inputs are available only in true form and Boolean constant 1 and 0 are available.

• 1
• 2
• 3
• 7

Question 43

Which of the following logic operations is performed by the following given combinational circuit?

• EXCLUSIVE-OR
• EXCLUSIVE-NOR
• NAND
• NOR

Question 44

Match the following:

• (1)
• (2)
• (3)
• (4)

Question 45

The output of the following combinational circuit is:

• X . Y
• X + Y
• X ⊕ Y
• (X ⊕ Y)`

Question 46

A multiplexer combines four 100-Kbps channels using a time slot of 2 bits. What is the bit rate?

• 100 Kbps
• 200 Kbps
• 400 Kbps
• 1000 Kbps

Question 47

How many 3-to-8 line decoders with an enable input are needed to construct a 6-to-64 line decoder without using any other logic gates?

• 7
• 8
• 9
• 10

Question 48

How many 2-input multiplexers are required to construct a 2¹⁰-input multiplexer?

• 1023
• 31
• 10
• 127

Question 49

The logic operations of two combinational circuits in Figure-I and Figure-II are

• entirely different
• identical
• complementary
• dual

Question 50

Which of the following is termed as minimum error code

• Binary code
• Gray code
• Excess 3 code
• Octal code