Logic Gates Recap

Which gate can be used as equality detector?

• OR

• NAND

• ENXOR

• NOT

Output of which logic gate is 1 when all its inputs are 0

• EXOR and NAND

• AND and EXNOR

• NOT and NAND

• OR and NOT

A(B+C) = AB+BC

• Commutative Law

• Distributive Law

• Demorgan's Theorem

• None of these

A+AB = ?

• A

• A+B

• B

• AB

Match the gates that give the same output.

• P-4,Q-1,R-3,S-2

• P-4,Q-2,R-3-S-1

• P-1,Q-2,R-3,S-4

• None

What should the input be , so that the output X=1?

• 1,0,0

• 1,1,1

• 0,1,1

• 1,0,1

The output of the logic gate is

• 0

• 1

• A

• A'

• 1,0,1,1

• 0,0,1,1

• 1,1,0,1

• 0,1,0,1

Name the Universal Gates

• NOR , NOT

• AND , OR

• OR , EXOR

• NAND, NOR

Use Boolean algebra to simplify the following relay (ladder logic) circuit and derive the expression.

• AB+BC

• A+BC

• AC+AB

• ABC+AC