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Solved problems for the chapter:

NOT, AND, OR, NAND and NOR Gates

View the theory »

Electric Current

1. Definition of electric current

2. Simple electrical circuit

2.1. Voltage source

2.2. Electrical consumer or load

2.3. Electrical conductor

3. Electric current in metals

3.1. Atomic model of electron motion

3.2. Speed of electrons along the conductor

4. Forum

↓ Show theory [1] ↓

Detailed solution steps are available at:

https://en.openprof.com/wb/chapter:not%2C_and%2C_or%2C_nand_and_nor_gates/3643/

Example 1.

The truth table for a logic gate is shown.

Which type of logic gate is it?

Example 2.

Which symbol represents an OR gate?

The diagram shows a logic gate.

Which input combinations at P and Q gives an output of 0 at R?

	P	Q
A	0	0
B	0	1
C	1	0
D	1	1

Which symbol represents a NAND gate?

What does the symbol shown represent?

an AND gate
a NOR gate
a NOT gate
an OR gate

This is the truth table for a logic gate.

Which symbol represents the logic gate?

A truth table for a type of logic gate is shown.

Which type of logic gate is it?

Two NAND gates are connected together as shown.

The arrangement acts like a single logic gate. What is the name of this single logic gate?

What does the symbol shown represent?

an AND gate
a NOR gate
a NOT gate
an OR gate

10.

The diagram shows two logic gates connected together.

The two inputs are both low (0). What are the logic states at P and at Q?

	P	Q
A	high (1)	high (1)
B	high (1)	low (0)
C	low (0)	high (1)
D	low (0)	low (0)

11.

An incomplete truth table for a NAND gate is shown.

What are the values of W, X, Y and Z?

	W	X	Y	Z
A	0	0	0	1
B	0	1	1	1
C	1	0	0	0
D	1	1	1	0

12.

The diagram shows an AND gate and an OR gate connected together.

Which combination of inputs X, Y and Z gives an output of 0?

	X	Y	Z
A	0	0	1
B	0	1	1
C	1	0	0
D	1	1	0

13.

The diagram represents a digital circuit using a NOR gate and an AND gate.

What is the truth table for this circuit?

14.

The circuit shown contains two gates.

Which truth table describes the operation of the circuit?

15.

Three NAND gates are connected in a single chip as shown.

The whole chip behaves as a single logic gate. Which type of logic gate does the chip act as?

AND gate
NAND gate
NOR gate
OR gate

16.

The two inputs of a NAND gate are joined together.

Which truth table represents the action of this gate?

17.

The diagram represents an alarm system using a logic gate.

The data for the system is shown.

The siren sounds when there is any indication of a fire. Which logic gate is used?

18.

The diagram shows a combination of logic gates.

Input P is at a logic state 0 (low) and input Q is at a logic state 1 (high). What are the logic states at output X and at output Y?

	output X	output Y
A	0	0
B	0	1
C	1	0
D	1	1

19.

The figure below shows a digital circuit designed to produce the values shown in the table for the output S from the two inputs P and Q.

The table below is the truth table for the circuit shown above.

Complete the column for point R in the table.
State which type of gate is used for gate X. Explain your answer.

statement .......................................................................................................................

explanation ....................................................................................................................

20.

Write down the truth table for an OR gate
Draw the symbol for a NOR gate.