PLC Chapter4 HW4

The two binary states can be defined as:

• a) “high” or “low”

• b) “on” or “off”

• c) 1” or “0”

• d) all of these

A gate can have one or more outputs but only one input. (True/False)

• True

• False

The ______ table shows the resulting output for each possible gate input conditions.

• a. input status

• b. output status

• c. data

• d. truth

A light that is "off" or a switch that is "open" would normally be represented by a binary 1. (True/False)

• True

• False

The OR function, implemented using contacts, requires contacts connected in series. (True/False)

• True

• False

With an AND gate, if any input is 0, the output will be 0. (True/False)

• True

• False

The symbol shown is that of a(an) ________ .

• a) AND gate

• b) OR gate

• c) NAND gate

• d) inverter

Hardwired logic is changeable only by altering the way devices are connected. (True/False)

• True

• False

Each programmed rung is a combination of input conditions connected from left to right with the symbol that represents the output at the far right. (True/False)

• True

• False

The correct Boolean equation for the combination logic gate circuit shown is:

• a. Y = ABCD

• b. Y = (AB) + (CD)

• c. Y = (A + B) (C + D)

• d. Y = (AB)/(CD)