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WorksheetsPLC CLASS REVISION
Total questions: 49
Worksheet time: 28mins
What does PLC stands for?
Programmable logic controller
Programming ladder CPU
Programming logic computer
Programmable limited control
Which of the following methods can be used to program PLC.
On display programming
LAD
FBD
All of the above
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?
Output coil
Normally Open contact
Normally Closed contact
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)
PLC is _______________ type of system
User friendly
Microprocessor based
Special Computer
All of the above
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.
Which 1 below is NOT PLC's configuration types
Unitary
Modular
Automation
Rack mounted
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.
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.
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
What is the given device used as?
Input
Output
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
Select a PLC input device
Sensor
Fan
Motor
Light
select the sequence of label from the below option.
1.programming port 2.output port 3.Input port
1.output port. 2.programming port 3.Input port
1.programming port 2.Input port 3.output port
What is the given device used as?
Input
Output
When the programming device must be connected to the controller
Always
When entering a program
While monitoring a program
Both b and c
PLC software that runs on personal computer can be used to
Write a PLC program
Document a PLC program
Monitor and control the process
all of the above
Field devices refers to what?
Input devices only
Load devices only
Output devices only
All devices physically wired to the PLC
What is called a PLC that come in one package with no separate removable IO units
Analog
Digital
Fixed
Modular
What type is a NPN Transistor
Sinking
Sourcing
What type is a PNP Transistor
Sinking
Sourcing
What was used traditionaly in place of PLC for Automation?
Computer
Solenoid
Relay
Transistor
what is called the Time taken to complete one scan cycle?
Cyclic Time
Scan Time
Updating the output
Fetch Time
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
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
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
Single acting cylinder should interfaced to PLC output pin via.....
Relay
solenoid valve
Contactor
Reed switch
How many PLC output pin are used to operate 5/2 way double solenoid valve correctly?
1
2
3
5
Roller limit switch can be installed to PLC input pin.....
Directly
Via relay
Via contactor
Via push button
What is this table?
AND logic table
OR logic table
OUTPUT
NOT
Solenoids,Lamps,motors are connected to
Analog Input
Analog Output
Digital Input
Digital Output
For PLC's Scan cycle which one is correct.
1.Program execute 2.Output Write 3. Input Read
1. Input Read 2.Output Write 3.Program execute
1.Output Write 2.. Input Read 3.Program execute
1. Input Read 2.Program execute 3.Output Write
__ __
A . B
is the same as
_______
A + B
A . B
B . A
______
A . B
How many different combinations of 1 and 0 are possible with 3 bits?
2
4
6
8
How many values does a Boolean variable have?
4
3
2
1
Infinite
Apply Demorgan's theorem to simplify the following expression: [(A+B)+C]'
ABC
A'+B+C
A+B+C
A'B'C'
In Boolean expression A+AB simplifies ____
A
B
A+B
1
Which of these are logic gates?
AND
OR
NOT
IF
ELSE
The Boolean representation of this PLC program is:
ABC + D
C + (A + B)D
C + D(A + B)
C(AB' + D')
what is the alternate name of Holding register?
Working Register
Group Register
Input register
Output register
One group register can control how many outputs?
16
8
1
2
How many bytes of data are required to represent the state of 32 inputs?
1
2
3
4
