Font size
WorksheetsPLC MCQ 1
Total questions: 67
Worksheet time: 17hrs 45mins
Which 1 below is NOT PLC's configuration types
Unitary
Modular
Automation
Rack mounted
Which below the main parts of PLC?
i/o module, power supply, controller
i/o module, decoder modul, DAC module
Controller, motor driver modul, relay module
Sensor, motor, controller
identify the input device in PLC
LED
Motor
Lamp
sensor
Identify the output device in PLC
pumps
switch
push button
sensor
the part of the PLC where inputs and outputs are connected are
input /output interface
memory
Processor
power supply
the plc stores its programs in
memory
programming device
power supply
input device
the program is written in _______________ and then transferred to the memory of PLC
input
Programming device
output
power supply
What does PLC stands for?
Programmable logic controller
Programming ladder CPU
Programming logic computer
Programmable limited control
Which of the following is a basic part of the PLC
Input Module
CPU
Output Module
All of the above
Select a PLC input device
Sensor
Fan
Motor
Light
Select a analog input device
Switch
Push button
Potentiometer
Digital Optical Sensor
What is the name of the part marked with red in the figure?
Power Supply connection
Output connection
Control Panel
Input connection
Which of the following methods can be used to program PLC.
On display programming
LAD
FBD
All of the above
What does this LAD connection represents
An interlock
Latch
Motor control
Two ways to control an output
In the relay, what is the main purpose of the coil?
Increase the current
Reduce the voltage
Generates the magnetic field
Protects the relay from overcurrent
What is this symbol called?
Normally Close contact
Normally Open contact
Output coil
What is this symbol called?
Output coil
Normally Open contact
Normally Closed contact
what is description of NO and NC
Not Open and Not Closed
Need Open and Not Closed
Never Open and Never Closed
Normally Open and Normally Closed
Why does PLC program in Ladder diagram Logic system need to have END function ?
To make the PLC turn off when reach the END function.
To make the PLC stop running when reach END function.
To make the PLC do nothing when reach the END function.
To make PLC know the end of program when reach the END function.
Which of the following is NOT part of basic PLC system?
Memory
Relay box
Power supply
Central Processing Unit (CPU)
What is meant by programming device in PLC?
Platform where data is processed.
Platform where program or control logic is written.
Platform where incoming power supply coming in.
Platform where input or output source is connected.
PLC is _______________ type of system
User friendly
Microprocessor based
Special Computer
All of the above
In traditional control system _________ makes the rule
Wiring
Program
In PLC system ___________ makes the rule.
Wiring
Program
PLC is preferred over traditional logic system because
Security & Speed of Operation
Visual Observation & Documentation
Flexible & Reliable
Compact
All of the above
Choose the symbol that is similar to this diagram.
Choose the symbol that is similar to this diagram.
What is the meaning of "download" ?
To transfer the program to PC
To retrieve the program from PLC
To transfer the program to PLC
To retrieve the program from PC
____________ track the number of events that take place in a process
On Delay Timer
Off Delay Timer
Up/Down Counter
Internal Memory
The______ counter that counts the events that has happened and decrements the counted number by one count.
Up Counter
Down Counter
Weekly Counter
Hourly Counter
(a) specifies the number of events that a counter has counted and is pre-set to zero
Counter Specifies the counter address in the _____storage file
Internal
External
Bit
Data
In Up Counter when the Done bit energies output enables when (a)
The Counter enable pin is enabled when the rung is (a)
A CTU accumulation is reset by the _______ instruction.
Overflow instruction
Reverse instruction
Reset instruction
Preset Value
Number of pins available in counter block diagram of siemens logosoft is ________
2
4
6
3
ON/OFF Thresholds in counters are _______
variables
constant value
address
time based
What is the job of the CPU?
Forms the interface between input field devices to the controller.
To provide DC power to the PLC.
Store and run the PLC software program.
Forms the interface between output field devices to the controller.
What is the address in the PLC program for a push-button that is landed on terminal 4 in the 3rd slot of the chassis?
I: 3/4
I: 4/3
O: 3/4
O: 4/3
Which type of memory stores the PLC operating system?
RAM
ROM
GOAT
USB
What does an optical isolator do?
Electrically isolates the internal components from the I/O terminals.
Uses the data tables to make logical decisions.
Takes a current signal and turns it into a pressure.
Powers up each individual card and it doubles as a communication bus.
How many binary bits are in a byte?
1
2
8
16
Which timer bit is similar to instantaneous contacts in electronic timers?
Timer Enable Bit
Timer Timing Bit
Timer Done Bit
Timer ID Bit
Single acting cylinder should interfaced to PLC output pin via.....
Relay
solenoid valve
Contactor
Reed switch
How many PLC output pin used to operate 5/2 way solenoid valve correctly?
1
2
3
5
When install reed switch to PLC input pin, it must be interfaced via X component.
What is X?
Switch
Push button
Relay
Solenoid valve
Roller limit switch can be installed to PLC input pin.....
Directly
Via relay
Via contactor
Via push button
Optical sensor can be installed to PLC input pin.....
Directly
Via relay
Via contactor
Via push button
24V dc motor can be installed to PLC output pin.....
Directly
Via relay
Via contactor
Via push button
12V dc motor can be installed to PLC output pin.....
Directly
Via relay
Via contactor
Via push button
AC 3 phase motor can be installed to PLC output pin.....
Directly
Via relay
Via contactor
Via push button
Forward reverse dc motor can be installed to PLC output pin.....
Directly
Via relay
Via contactor
Via push button
The easiest and fasterst way to program an MPS system with sequence process by using.....
Mnemonic cod
Ladder diagram
SFC
Instruction text
The easiest and fasterst way to program an MPS system with complex process as in WSMB mechatronic competitio by using.....
Mnemonic cod + ladder diagram
Ladder diagram + SFC
SFC + instruction text
Instruction text + mnemonic codw
What does PLC stand for:
Please Learn Carefully
Programmable Logic Controller
Program Learn Code
Programming Learning Computing
What one is not true?
PLCs use inputs to create outputs
PLCs cannot control a process
PLCs need analog data converted to digital
Which I/O modules requires more space?
Plug-in modules
Expansion modules
Which is not part of a wiring diagram
What components are connected
Where components are connected
How components are connected
What each component looks like
Which is not an input
push button
pilot light
sensor
potentiometer
Which is not an output
Potentiometer
Pilot Light
Motor
Alarm light
What is the given device used as?
Input
Output
What is the given device used as?
Input
Output
What is the given device used as?
Input
Output
What is this table?
AND logic table
OR logic table
OUTPUT
NOT
This table for
OR
AND
NOT
None of the above
This circuit is :
AND
OR
INPUT
OUTPUT
