Subsection 05a/b Logic circuits Flashcards
A CMOS logic gate is operated from a 12v supply, if a voltage of 3v is measured at the input to the gate this would be considered?
LOGIC 0
LOGIC 1 may be represented in an analogue system by ( where Q is an output of a latch/flip-flop) = ?
Positive/ Magnetised/ Q
A Logic gate having 12-50 gates is an example of?
MSI
A NAND and NOR to become a NOT gate have?
Their inputs connected together
A NOR gate with both inputs inverted becomes?
an AND gate
A schematic diagram for a flap warning system is most likely to include?
Both AND + OR gates
A standard quad TTL NAND gate is an example of?
LSI technology
Adding invertors to the two inputs of an AND gate makes a?
NOR
AND gate output is 1 when inputs are?
Both 1
An AND gate with inverted inputs and an inverted output is equivalent to?
An OR gate
An Aircraft system most likely to use a system of logic gates would be?
Landing gear
In positive logic representation, state 1 is?
More positive than 0
Logic gates internal operating mechanisms are produced from?
Transistors
Making an inverter from a NAND or NOR gate is achieved by?
Connecting the inputs
Switching within logic gates is normally achieved with?
Diodes
The most appropriate logic family for use in a portable of test equipment is?
MOS
The output of a NOT gate is 1, the input is?
0
The output of a NOT gate is 1, the input is?
0
The output of an AND gate having two inputs A+B is logic 1, the two inputs will have the logic states of?
A=1 B=1
The output of an OR gate having two inputs A+B is logic 0 the two inputs will have the logic states of?
A=0 B=0
The truth table of A=0011 B=0101 and X=0110 indicates that the logic device is?
An exclusive OR gate
What logic gate will only give an output logic 1 when both A+B inputs are either both logic 1 or both logic 0?
A NOT XOR gate
What sort of gate requires either input negative or two negative input voltages to operate?
NAND
What sort of gate requires two positive voltages to operate?
AND
When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is?
NEGATIVE
When will a NAND gate give logic 0 at the output?
When both inputs are at 1
Which logic gate can be represented as a parallel circuit?
OR gate
Which logic gate has both inputs ‘HIGH’ to get an output?
AND
A Full adder has 3 inputs and?
Two outputs
The ‘FAN IN’ in a gate is the?
Number of inputs to a gate
Tristate devices are found on?
Output circuits
