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?

Choice 1
NAND
Choice 2
NOR
Choice 3
XOR
Choice 4 AND


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

Choice 1
Choice 2
Choice 3
Choice 4



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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?

Choice 1
0101
Choice 2
1101
Choice 3
1111
Choice 4 0000


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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

Choice 1
X
Y
Z
0
0
1
0
1
0
1
0
0
1
1
1
Choice 2
X
Y
Z
0
0
0
0
1
1
1
0
1
1
1
1
Choice 3
X
Y
Z
0
0
1
0
1
1
1
0
0
1
1
1
Choice 4
X
Y
Z
0
0
0
0
1
0
1
0
0
1
1
0


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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


Choice 1
I, II and IV only
Choice 2
II, III and IV only
Choice 3
I, III and IV only
Choice 4 I, II, III and IV


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electromagnetism notes