Logic Gates

Which of the following two input logic functions can act as a Universal gate?

• A ⊕ B

• AB

• (A+B)’

• None of the above

The output of an AND gate will be 1 if

• At least one of the inputs is at 1.

• At most one of the inputs is at 0.

• An even number of inputs must be at 1.

• None of these.

XOR is known as

• An even function

• An odd function

• Both even or odd function

• None of these

which of the following functions is referred as complementary?

• NAND

• NOR

• OR

• NOT

A NAND gate is called a universal logic element because

• All digital computers use NAND gates

• All the minimisation techniques are applicable for optimum NAND gate realisation

• Everybody use this gate

• Any logic function can be realized by NAND gates alone

If a input signal a=11100 is applicable to a NOT gate ,its output signal is

• 00011

• 01001

• 00011

• 1000

When A and B represent the inputs of an Exclusive OR logic gate ,its output O will be

• O=AB’+A’B

• O=AB+A+B

• O=A+B+(AB)'

• None of these

A two input OR gate is designed for positive logic.Consider that this gate is operated with negative logic.Then the logic operation will be

• OR

• AND

• NOR

• EX-OR

AND-OR realisation is equivalent to

• SOP

• POS

• K-map

• None of these

OR-AND realisation is equivalent to

• SOP

• POS

• K-map

• None of these