Logic Circuits

Question 1

Disadvantages of a semi conductor

Answer 1

Sensitive to temperature

Overheating can cause malfunction and reduce components working life

Sensitive to supply voltage polarity

Question 2

Semi Conductor

Answer 2

Highly resistive in natural state but electrical properties modified

Adding energy can change it into a conductor

Question 3

Zener Diode

Answer 3

Diode that allows reverse current flow after a voltage has been achieved

Used in voltage regulators and as protection device for voltage sensitive equipment

Question 4

Logic Circuits represent

Answer 4

A switching action in a circuit

Question 5

The AND gate

Answer 5

Need logic 1 from both inputs

Semi circle looking bullet

Question 6

The OR Gate

Answer 6

Produces a logic 1 as long as there is one logic 1 in the sequence

1 + 0 = 1
1 + 1 = 1
0 + 0 = 0

Question 7

The NAND Gate

Answer 7

If two logic 1 = logic 0 output

1 + 1 = 0
0 + 1 = 1
0 + 0 = 1

Think nipple

Question 8

The NOR Gate

Answer 8

Anything apart from logic 0 inputs produces 0 voltage

Question 9

The Not Gate

Answer 9

1 input - if logic entry is 0 output will be logic 1

1 = 0
0 = 1