GATE 2019: Digital Electronics Quiz 2

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Question 1

How many output lines are required to design a BCD-to-decimal decoder with 4 inputs?

• A4
• B8
• C10
• D16

Question 2

To implement 6 × 64 decoder how many number of 2decoders are required?

• A24
• B18
• C19
• D21

Question 3

The minimum number of multiplexers required to implement a half adder circuit are [when only basic inputs are available, compliments are not available].

• A4
• B2
• C3
• D5

Question 4

Given f (A, B, C) = design 8 x 1 MUX using A, B, C as selection lines. Find the inputs ?

• A(1, D, 1, , 1, 0, D, D)
• B(1, D, 1, D, 1, 0, D, D)
• C(1, D, 1, 1, 1, D, D, D)
• DNone of these

Question 5

Consider the logic circuit given below. The min terms in f(A,B,C,D) are _____.

• A
• B
• C
• D

Question 6

f(A, B, C, D) = π(0,1, 3, 4, 5, 7, 9, 11, 12, 13, 14, 15) is a maxterm representation of a Boolean function f(A, B, C, D) where A is the MSB and D is the LSB. The equivalent minimized representation of this function is

• A
• B
• C
• D

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