ELECTRONICS CHAPTER 5 3

The output of a NOR gate is HIGH if

• all inputs are HIGH

• any input is HIGH

• any input is LOW

• all inputs are LOW

A device which converts BCD to seven segment is called

• encoder

• decoder

• multiplexer

• none of these

The output of a NOT gate is HIGH when

• the input is LOW

• the input is HIGH

• power is applied to the gate's IC

• power is removed from the gate's IC

TTL operates from a _____

• 9-volt supply

• 3-volt supply

• 12-volt supply

• 5-volt supply

The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):

• Boolean constant

• Boolean variable

• truth table

• input logic function

How many pins does the 4049 IC have?

• 14

• 16

• 18

• 20

The power dissipation, Po, of a logic gate is the product of the

• dc supply voltage and the peak current

• dc supply voltage and the average supply current

• ac supply voltage and the peak current

• ac supply voltage and the average supply current

The switching speed of CMOS is now

• competitive with TTL

• three times that of TTL

• slower than TTL

• twice that of TTL

A CMOS IC operating from a 3-volt supply will consume

• less power than a TTL IC

• more power than a TTL IC

• the same power as a TTL IC

• no power at all

An OR gate has 4 inputs. One input is high and the other three are low. The output

• is low

• is high

• is alternately high and low

• may be high or low depending on relative magnitude of inputs