Digital Electronics - Study Mode

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[#126] In Boolean Algebra, A(A + B') is equivalent to:

(A) 0

(B) 1

(C) A

(D) B

Correct Answer

(C) A

[#127] Choose the correct one from among the alternatives A, B, C, D after matching an item from List-I with the most appropriate item in List-II List-I List-II a. Shift register 1. Frequency division b. Counter 2. Addressing in memory chips c. Decoder 3. Serial to parallel data conversion

(A) a-3, b-2, c-1

(B) a-3, b-1, c-2

(C) a-2, b-1, c-3

(D) a-1, b-2, c-3

Correct Answer

(B) a-3, b-1, c-2

[#128] A full adder circuit is constructed from two 2 input Ex OR gates, two 2-input AND gate and a

(A) 2-input OR gate

(B) input Ex-NOR gate

(C) 2-input AND gate

(D) 2 input NAND gate

Correct Answer

(A) 2-input OR gate

[#129] Which one of the following logical operations is performed by the digital circuit shown below?

(A) NOR

(B) NAND

(C) EX-OR

(D) OR

Correct Answer

(C) EX-OR

[#130] For CMOS implementation of 2 input XOR logic gate, how many nMOS and pMOS transistors are required?

(A) 2 nMOS and 2 pMOS

(B) 3 nMOS and 3 pMOS

(C) 6 nMOS and 6 pMOS

(D) 8 nMOS and 8 pMOS

Correct Answer

(C) 6 nMOS and 6 pMOS