This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “PLC Operations”.
1. How is the operating cycle of PLC is termed as?
a) Operation
b) Scan
c) Pan
d) Cycle
View Answer
Explanation: The operating cycle of the programmable Logic Controller is typically termed as Scan. It includes collecting the instructions in the form of programs, executing the programs sequentially and returning to the initial instruction finishing.
2. Which of the following process involves reading of the inputs by the processor?
a) Processor Scan
b) Process Scan
c) Reading Scan
d) Input Scan
View Answer
Explanation: In order to read the inputs to the Programmable Logic Controller, it will be fed to the processor. The Processor processes the inputs and executes the function given by the given Programmable Logic Controller Programmer.
3. Control Program will not be executed during the program scan.
a) True
b) False
View Answer
Explanation: Program Scan executes the control program. It executes the instructions stored in the memory one by one. It has the capability to decide the output based on the previous inputs given by the user.
4. Which of the following process updates the values in the PLC cycle?
a) Full Scan
b) Output Scan
c) Input Scan
d) Null Scan
View Answer
Explanation: Output scan updates the values based on the input values in the memory during the typical Programmable Logic Controller cycle. The cycle will restart after finishing the current cycle. It can also self check to determine the faults in it.
5. Which term is used to define the time required to perform the scan of PLC cycle?
a) Scan Time
b) PLC time
c) Defining Time
d) Required Time
View Answer
Explanation: The term which is used to denote the time required to perform the scan of a typical Programmable Logic Controller cycle is known as Scan Time. It depends on the number of inputs given and the complexities of the functions to be performed.
6. How is the scan time of PLC cycle measured?
a) Macro seconds
b) Milliseconds
c) Microseconds
d) Nanoseconds
View Answer
Explanation: Scan times of a typical PLC cycle are usually measured in milliseconds. The average scan time of Programmable Logic Controller will be 10-50 milliseconds. For kilo programs, it will take 2-5 milliseconds in general.
7. Which of the following is used to activate the output if the entry ceases?
a) Activator
b) Stopper
c) Mapping
d) Latching
View Answer
Explanation: In order to activate the output after the entry ceases, Latching is done in the Programmable Logic Controller circuit. It is typically used in applications to run the system in the absence of the user.
8. Programmable Logic Controllers perform slower than conventional relays.
a) True
b) False
View Answer
Explanation: Conventional Relays were slower than Programmable Logic Controllers. Programmable Logic Controllers replaced conventional relays because of its quick performing ability to execute the functions.
Sanfoundry Global Education & Learning Series – Flexible Manufacturing System.
To practice all areas of Flexible Manufacturing System, here is complete set of 1000+ Multiple Choice Questions and Answers.
If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]
