Table of Content 4.1 Thermionic Emission and Cathode Ray 4.2 Carthode Ray Oscilloscope 4.3 Semiconductor 4.4 Semiconductor Diode 4.5 Trasistor 4.6 Logic Gate

# Logic Gate

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1) A is a logic gate with input X and Y. Z is the output of the logic gate. The truth table of the logic gate is shown in table above. What type of logic gate is A?

 NAND NOR XOR AND

2) Table above shows the truth table of a logic gate. Which of the following is the symbol of the logic gate?

3) Diagram above shows a logic gate circuit. The input at P and Q are 1001 and 1100 respectively. What is the signal of the Z output?

 0101 1101 1111 0000

Explanation
The input and output of the logic gate is as follow:

4) The circuit shown above is a series of logic gate in an electronic appliance. The truth table of the Z output is

 X Y Z 0 0 1 0 1 0 1 0 0 1 1 1

 X Y Z 0 0 0 0 1 1 1 0 1 1 1 1

 X Y Z 0 0 1 0 1 1 1 0 0 1 1 1
 X Y Z 0 0 0 0 1 0 1 0 0 1 1 0

Explanation
The input and output of the logic gate is as follow:

5) Diagram (a) above shows a combination of logic gate labeled A, B, C and D. Table (a) shows the truth table of the logic gate.. Which of the following statements below are true?

I. A is an OR gate.
II. B is an AND gate
III. C is an NAND gate
IV D is a NOT gate

 I, II and IV only II, III and IV only I, III and IV only I, II, III and IV