Quiz 3 142 CA

What is one of the drawbacks to using hand-held programmers? a. They require more time b. They are more expensive c. They lack portability d. They require backup power

a. They require more time

When a PLC is first turned ON, it will run a self-diagnostic or self-check test. a. true b. false

a. true

Which of the following is not one of the four steps in a typical program scan? a. read and solve the logic of the program ( ladder logic) b. clear ROM to accommodate new program data c. determine the status of the input device (ON or OFF) d. update the output devices (turn ON or OFF)

b. clear ROM to accommodate new program data

The actual scan time, or time it takes the PLC to complete a four-step scan, decreases as the number of the program words increases. a. true b. false

b. false

Which term describes changes that are made after a program has been loaded into the processor? a. stopgap programming b. on-line programming c. delayed programming d. off-line programming

b. on-line programming

Memory that requires a battery backup to protect data in case of a power failure is known ______. a. FLASH b. volatile c. solid-state d. EEPROM

b. volatile

1K of memory is actually ____________. a. 1,000 words b. 1,010 words c. 1,024 words d. 1,042 words

c. 1,024 words

What is a processor's maximum capacity of inputs and outputs a. 1,042 b. 256 c. 40,000 d. unlimited

c. 40,000

Which of the following can be used to erase memory in an EPROM chip? a. loss of power b. activation of an erase signal c. exposure to UV light d. removal from board

c. exposure to UV light

Reverse video of contacts and coils in a programmable device indicates which of the following? a. power failure b. memory loss c. logic continuity d. program timeout

c. logic continuity

Memory that can retain stored data following loss of power in a device is called ______________ memory. a. volatile b. solid-state c. nonvolatile d. CMOS-RAM

c. nonvolatile

A(n) __________ timer is preset to an amount of time that is slightly longer than the normal scan time. a. logic b. quartz c. watchdog d. interval

c. watchdog

Which of the following is not a type of nonvolatile memory? a. EEPROM b. PROM c. FLASH d. HMOS

d. HMOS

What is the most common type of volatile memory? a. PROM b. EAROM c. EEPROM d. RAM

d. RAM

For safety, lithium batteries should not ne exposed to which of the following? a. cold b. copper c. magnets d. watter

d. watter