Question 1

____ coils revert to their de-energized state whenever the PLC is cycled from stop to run or whenever the power is cycled.&#10;A) Retentive&#10;B) Nonretentive&#10;C) Negative&#10;D) Open

Accepted Answer

Nonretentive coils revert to their de-energized state whenever the PLC is cycled from stop to run or whenever the power is cycled. Retentive coils maintain their state even after a power cycle or when the PLC is cycled from stop to run. Negative and open are not relevant terms in this context.

Question 2

A(n) ____ output module will produce output signals that are either 0 to 10 VDC or 4 to 20 milliamperes.&#10;A) analog&#10;B) digital&#10;C) differential&#10;D) variable

Accepted Answer

An analog output module produces output signals that are in the form of continuous voltage or current levels. The options given are 0 to 10 VDC or 4 to 20 milliamperes, which are both forms of analog signals. Digital output modules produce binary signals, while differential and variable output modules have different functions and characteristics.

Question 3

____ timers will retain their timed value during a loss of power.&#10;A) Retentive&#10;B) Nonretentive&#10;C) On-delay&#10;D) Off-delay

Accepted Answer

Retentive timers have the ability to retain their timed value even during a loss of power. Nonretentive timers, on the other hand, will reset their value to zero during a power loss. On-delay and off-delay timers refer to the way the timer functions in relation to the activation signal and do not relate to their ability to retain their value during a power loss.

Question 4

___ coil is a nonretentive coil used to perform a latch function.&#10;A) SET&#10;B) RESET&#10;C) LET&#10;D) TLC

Accepted Answer

A SET coil is used in ladder logic programming for PLCs (Programmable Logic Controllers) to perform a latch function, allowing the output to remain active even after the input condition is no longer true.

Question 5

Digital input modules are available for DC inputs, AC inputs, or a mix.

Accepted Answer

Digital input modules are available for different types of inputs, including DC and AC inputs, and can also handle a mix of inputs.

Question 6

Which is a PLC program control instruction?&#10;A) LOCATION&#10;B) SEND&#10;C) MRC&#10;D) ENDMCR

Accepted Answer

ENDMCR is a PLC program control instruction used to mark the end of a master control relay section in a program.

Question 7

The five programming languages for PLCs are the ladder diagram, the function block diagram, the instruction list, the sequential function chart and the structured graphic.

Accepted Answer

The five programming languages for PLCs are the ladder diagram, the function block diagram, the instruction list, the sequential function chart, and the structured text, not structured graphic.

Question 8

____ timers perform a timing function while receiving power. The state of the associated contact(s) do not change until the timer has timed out.&#10;A) Coil&#10;B) Off-Delay&#10;C) On-delay&#10;D) End

Accepted Answer

On-delay timers start timing when power is applied, and the contacts change state only after the set time has elapsed.

Question 9

Which PLC language is a BASIC style language?&#10;A) Sequential Function Chart&#10;B) Structured Text&#10;C) Ladder Diagram&#10;D) Instruction List

Accepted Answer

Structured Text is a BASIC-style language that uses familiar programming structures like IF-THEN-ELSE statements and loops. It is similar to the language used in programming PC applications, and is particularly useful for complex algorithms or mathematical calculations.

Question 10

Down-counters perform a counting function when the associated input element transitions from a(n) ____ to a(n) ____ state.&#10;A) on, off&#10;B) off, on&#10;C) on, reset&#10;D) off, reset

Accepted Answer

Down-counters count down the occurrences of the input transition from "on" to "off" state. This transition is also called a falling edge. Therefore, option B, where the input element transitions from "off" to "on" state, cannot trigger the counting function of a down-counter.

Question 11

Most PLCs consist of an assortment of modules (input and output), a CPU, a power supply, and a rack in which to mount the modules.

Accepted Answer

The answer of Most PLCs consist of an assortment of...

Question 12

One big advantage of using point-to-point wiring of relay controls over a PLC is that the wiring is greatly simplified and reduced.

Accepted Answer

The answer of One big advantage of using point-to-point wiring...

Question 13

Instruction List is a low-level program best suited for small applications and fast execution.

Accepted Answer

The answer of Instruction List is a low-level program best...

Question 14

The Function Block Diagram is a(n) ____ language.&#10;A) graphical&#10;B) text-based&#10;C) BASIC style&#10;D) C++ style

Accepted Answer

The answer of The Function Block Diagram is a(n) ____...

Question 15

A PLC will treat all inputs and output sources the same; they will be looked upon as a(n) ____.&#10;A) signal&#10;B) voltage source&#10;C) resistance&#10;D) load

Accepted Answer

The answer of A PLC will treat all inputs and...

Deck 24: Programmable Logic Controllers