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02 - Truth tables and logic circuits

 1. The concept may be confusing at first but all digital circuits are created using a combination of logic _______________ 
Learning note: 
==============
>>Electronic gates require a power supply.

>>Gate INPUTS are driven by voltages having two nominal values, e.g. 
0V and 5V representing logic 0 and logic 1 respectively.

>>The OUTPUT of a gate provides two nominal values of voltage only, 
e.g. 0V and 5V representing logic 0 and logic 1 respectively. 

>>In general, there is only one output to a logic gate except in some 
special cases.There is always a time delay between an input being 
applied and the output responding.

  mates

  gates

  CPUs

  bulbs

 2. The functionality of each gate can be described using a ________________

  truth table

  mathematical formula

  alegebraic expression that uses brackets

  logical deduction using english statements

 3. The following gate is an '_______' gate.
orgate.gif

  AND

  NOT

  OR

  NAND

 4. The NOT gate is an electrical circuit that produces an _______ version of the input as the output. (e.g. a 1 will be a 0)

  converted

  positive

  inverted

  negative

 5. A truth table can show the operations (with inputs and outputs) of any given gates. The following shows the truth table for the ________ 
2 Input truth table for an ____gate
======================
A      B      Output
------------------------
0       0            0
0       1            0                                   1       0            0       
1       1            1

  And Gate because both inputs (A and B) need to be 1 in order for the output to be 1

  This truth table is incorrect and doesn't describe any gate

  NOT Gate - because the output is always the inversion (opposite) of what is in A or B

  Or Gate because when either A or B inputs are 1 the output is 1

 6. Digital systems are said to be constructed by using logic gates. These gates are the AND, OR, NOT, NAND, NOR, EXOR and EXNOR gates.
allgates.png

  TRUE

  FALSE

 7. The following gate is an '_______' gate.
andgate.gif

  OR

  NOT

  AND

  NAND

 8. The following gate is an '_______' gate.
orgate.gif

  AND

  OR

  NAND

  NOT

 9. The following gate is an '_______' gate.
notgate.gif

  AND

  OR

  NOT

  NAND

 10. The AND gate is an electrical circuit that gives an output of ____ only if all of its inputs are also _____.

  0

  1

  3

  2

 11. The OR gate is an electrical circuit that gives an output of a 1 if_______________ of its inputs are a 1.

  at least one

  at least two

  all

  none

 12. If the input into a NOT gate is a 0 the output will also be a 0.

  TRUE

  FALSE

 13. Operations carried out by a NOT gate are also known as:

  opposing

  oppositing

  inverting

  reverting

 14. A logic gate in which the output is zero for inputs in which one input is one and other input is zero is likely to be:

  a FOR gate

  an AND gate

  a NOT gate

  an OR gate

 15. This is a table used to show possible combination of inputs for a specific output

  Logic Table

  Truth Table

  False Table

  Gate Table


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