Subsection 05a/b Logic circuits

Question 1

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?

Answer 1

LOGIC 0

Question 2

LOGIC 1 may be represented in an analogue system by ( where Q is an output of a latch/flip-flop) = ?

Answer 2

Positive/ Magnetised/ Q

Question 3

A Logic gate having 12-50 gates is an example of?

Answer 3

MSI

Question 4

A NAND and NOR to become a NOT gate have?

Answer 4

Their inputs connected together

Question 5

A NOR gate with both inputs inverted becomes?

Answer 5

an AND gate

Question 6

A schematic diagram for a flap warning system is most likely to include?

Answer 6

Both AND + OR gates

Question 7

A standard quad TTL NAND gate is an example of?

Answer 7

LSI technology

Question 8

Adding invertors to the two inputs of an AND gate makes a?

Answer 8

NOR

Question 9

AND gate output is 1 when inputs are?

Answer 9

Both 1

Question 10

An AND gate with inverted inputs and an inverted output is equivalent to?

Answer 10

An OR gate

Question 11

An Aircraft system most likely to use a system of logic gates would be?

Answer 11

Landing gear

Question 12

In positive logic representation, state 1 is?

Answer 12

More positive than 0

Question 13

Logic gates internal operating mechanisms are produced from?

Answer 13

Transistors

Question 14

Making an inverter from a NAND or NOR gate is achieved by?

Answer 14

Connecting the inputs

Question 15

Switching within logic gates is normally achieved with?

Answer 15

Diodes

Question 16

The most appropriate logic family for use in a portable of test equipment is?

Answer 16

MOS

Question 17

The output of a NOT gate is 1, the input is?

Answer 17

0

Question 18

The output of a NOT gate is 1, the input is?

Answer 18

0

Question 19

The output of an AND gate having two inputs A+B is logic 1, the two inputs will have the logic states of?

Answer 19

A=1 B=1

Question 20

The output of an OR gate having two inputs A+B is logic 0 the two inputs will have the logic states of?

Answer 20

A=0 B=0

Question 21

The truth table of A=0011 B=0101 and X=0110 indicates that the logic device is?

Answer 21

An exclusive OR gate

Question 22

What logic gate will only give an output logic 1 when both A+B inputs are either both logic 1 or both logic 0?

Answer 22

A NOT XOR gate

Question 23

What sort of gate requires either input negative or two negative input voltages to operate?

Answer 23

NAND

Question 24

What sort of gate requires two positive voltages to operate?

Answer 24

AND

Question 25

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?

Answer 25

NEGATIVE

Question 26

When will a NAND gate give logic 0 at the output?

Answer 26

When both inputs are at 1

Question 27

Which logic gate can be represented as a parallel circuit?

Answer 27

OR gate

Question 28

Which logic gate has both inputs ‘HIGH’ to get an output?

Answer 28

AND

Question 29

A Full adder has 3 inputs and?

Answer 29

Two outputs

Question 30

The ‘FAN IN’ in a gate is the?

Answer 30

Number of inputs to a gate

Question 31

Tristate devices are found on?

Answer 31

Output circuits