Digital electronics miscellaneous
- Expression for Y (A, B, C) in figure, where A, B and C are Boolean variables is—
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The given circuit
From above circuit, we get
Y = A B. 1 + AB.C + A B.0 + AB. 0
or
Y = A B + ABC
or
Y = A (B + BC) = A (B+C) = AB + AC
Correct Option: C
The given circuit
From above circuit, we get
Y = A B. 1 + AB.C + A B.0 + AB. 0
or
Y = A B + ABC
or
Y = A (B + BC) = A (B+C) = AB + AC
- Which of the following is known as half-adder?
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XOR gate is known as half adder.
Correct Option: A
XOR gate is known as half adder.
- Consider the following circuit which one of the following gives the function implemented by the MUX based digital circuit?
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The given circuit
From figure
F = C2 C1.1 + C2C1( A + B) + C2 C1S + C2 C1.0
or
F = C2 C1 + C2 C1S + C2C1 A B
Correct Option: D
The given circuit
From figure
F = C2 C1.1 + C2C1( A + B) + C2 C1S + C2 C1.0
or
F = C2 C1 + C2 C1S + C2C1 A B
- It is required to construct a 2n to 1 multiplexer by using 2 to 1 multiplexers only. How many of 2 to 1 multiplexers are needed?
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To construct a 2n to 1 multiplexer by using 2 to 1 multiplexer, the number of 2 to 1 multiplex required are 2n– 1. For example, n = 3 means we have to construct 8 to 1 multiplexer. So we need 2n – 1 = 7, 2 to 1 multiplexer.
Correct Option: A
To construct a 2n to 1 multiplexer by using 2 to 1 multiplexer, the number of 2 to 1 multiplex required are 2n– 1. For example, n = 3 means we have to construct 8 to 1 multiplexer. So we need 2n – 1 = 7, 2 to 1 multiplexer.
- To add two m-bit numbers, the required number of half adder is—
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To add two m-bit numbers, the required no. of half adder is 2m–1.
Correct Option: A
To add two m-bit numbers, the required no. of half adder is 2m–1.
