QUIZ 2.2 Digital Circuits and Logic Gates

Which of the following is false?

A NOT gate cannot accept more than one input.

A gate other than NOT gate cannot accept more than two inputs.

A NAND gate has the same effect as placing an AND gate followed by a NOT gate.

An OR gate outputs 1 when an input is not equal to 0.

In constructing circuits, which of the following is incorrect?

No output of a gate can eventually be fed back into that gate.

Two input wires can be combined.

An output wire can be used as input.

A single input wire can be split partway and used as input for two separate gates.

The lights in a classroom are controlled by three switches. Moving either switch to the opposite position turns the lights off if they are on and on if they are off. Assume the lights have been installed so that when all switches are in the down position, the lights are off.
Question: How many input combinations are there which makes the lights turn on?

Which of the following is the Boolean expression of the given input/output table?

$$(P\cdot Q\cdot \overline{R})\cdot(\overline{P}\cdot Q\cdot R)$$

$$(P\cdot Q\cdot \overline{R})+(\overline{P}\cdot Q\cdot R)$$

$$(P+Q+\overline{R})\cdot(\overline{P}+Q+R)$$

$$(P+Q+\overline{R})+(\overline{P}+Q+R)$$

Which of the following is true based on the pairs of circuits below?

Only the top pair of circuits are equivalent.

Only the bottom pair of circuits are equivalent.

Both the top and bottom pair of circuits are equivalent.

Neither the top nor bottom pair of circuits are equivalent.

How many gates would be required to implement the following expression: $$xy+x(x+z)+y(x+z)$$ before simplification?

For the expression $$xy+x(x+z)+y(x+z)$$, what is the simplified expression and its corresponding required number of gates?

$$xy+(x+y)(x+z) \text{ ; 4 gates}$$

$$y(x+z)+x \text{ ; 3 gates}$$

$$x+yz+xy \text{ ; 3 gates}$$

$$x+yz \text{ ; 2 gates}$$

The circuit below can be simplified to:

A ______ is a circuit that outputs a 1 for exactly one particular combination of input signals and outputs 0’s for all other combinations.

Two digital logic circuits are ______ if, and only if, their input/output tables are identical.

QUIZ 2.2:
Digital Circuits and Logic Gates

QUIZ 2.2:
Digital Circuits and Logic Gates

QUIZ 2.2 Digital Circuits and Logic Gates