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WorksheetsONE MARKS IN PLC
Total questions: 163
Worksheet time: 1hrs 22mins
Name
Class
Date
1.
PLC works with which values?
a)
Octal
b)
Boolean
c)
Hexadecimal
d)
All of the above
2.
1 nibble =
a)
4 byte
b)
4 bits
c)
4 KB
d)
8 bits
3.
1 word =
a)
16 bytes
b)
16 KB
c)
8 bits
d)
16 bits
4.
Full form of ADC is
a)
Analog to Data Converter
b)
Analog to Digital Converter
c)
Amplitude to Digital Converter
d)
Analog to Discrete data Converter
5.
PLC works with which values?
a)
Octal
b)
Boolean
c)
Hexadecimal
d)
All of the above
6.
1 byte =
a)
16 bytes
b)
16 KB
c)
8 bits
d)
16 bits
7.
A binary number with one digit is called a ____
a)
Bit
b)
byte
c)
Word
d)
Nibble
8.
Analog signal can be converted to Digital values using
a)
Resolution
b)
Sampling
c)
Memory Allocation
d)
None of the above
9.
The A/D converter samples the amplitude of the analog signal at
a)
Discrete intervals
b)
Discrete function
c)
maximum range
d)
None of the above
10.
three types of analog signals in PLC programming___ ____ ____
a)
Voltage, Current & Resistance
b)
Voltage,Current & Transistor
c)
Resistor,Current & Transistor
d)
All
11.
the process of mapping continuous infinite values to a smaller set of discrete finite values is ______
a)
Resolution
b)
Quantization
c)
Sampling
d)
ADC
12.
The number of bits used to represent the analog input defines
a)
Resolution
b)
Range
c)
Sampling
d)
ADC
13.
PLC Value 27648 represents 10V analog signal. calculate the real resolution of our analog signal.
a)
361.7 μV
b)
367.7 μV
c)
369.7 μV
d)
360.7 μV
14.
In Siemens PLC, what is Overshoot Range?
a)
22.86 mA
b)
22.96 mA
c)
22.81 mA
d)
22.76 mA
15.
In Siemens PLC, what is Undershoot Range?
a)
1.815 mA
b)
1.885 mA
c)
1.15 mA
d)
1.185 mA
16.
In Siemens PLC, what is Overflow Range?
a)
22.86 mA
b)
22.96 mA
c)
22.81 mA
d)
22.76 mA
17.
Wiring of Analog signals is categorised into?
a)
Voltage and Resistance
b)
Voltage and Current
c)
Resistance and Current
d)
None of the above
18.
Which of the following is example for input analog sensors and transmitters.
a)
Submersible Level Transmitters
b)
Pressure Transmitter Sensor
c)
Temperature Sensor
d)
All
19.
Temperature transmitter with a 4-20 mA output. Connected to the transmitter is a temperature sensor. The transmitter is then calibrated to a range of 0-100 degrees. What this means is that when the temperature is 0 degrees the output of the transmitter will be _____
a)
4 mA
b)
12mA
c)
16mA
d)
20mA
20.
Temperature transmitter with a 4-20 mA output. Connected to the transmitter is a temperature sensor. The transmitter is then calibrated to a range of 0-100 degrees. What this means is that when the temperature is 100 degrees the output of the transmitter will be _____
a)
4 mA
b)
12mA
c)
16mA
d)
20mA
21.
What is common between both voltage and current analog signal wiring?
a)
Temperature
b)
Resistance
c)
Reactance
d)
Current
22.
Analog voltage inputs has two terminals, what are those?
a)
AGND and AIP
b)
AIN and AG
c)
AIN and AGND
d)
None of the above
23.
All electrical wires (conductors) have resistance and hence creating a ____ drop.when you haveas long as distances of wiring.
a)
Current
b)
Resistance
c)
Voltage
d)
All
24.
PLC analog module terminal AIN is connected to______terminal of voltage source.
a)
Positive(+)
b)
Negative(-)
c)
Ground
d)
signal
25.
PLC analog module terminal AGND is connected to______terminal of voltage source.
a)
Positive(+)
b)
Negative(-)
c)
Ground
d)
signal
26.
Which terminal is used as reference for our analog signal?
a)
AIN
b)
AGND
c)
AI
d)
GND
27.
How can we reduce the effect of Electromagnetic Interference?
a)
Sampling
b)
Shielding
c)
EMC
d)
Resistance
28.
The current in analog signals is usually measured in _____unit
a)
Resistance
b)
Voltage
c)
Amperes (A).
d)
milliamperes (mA).
29.
A resistor is put between positive (AI) and negative (AGND). This will converts our current signal to a voltage signal.This resistor called as___
a)
Capacitor
b)
Closed loop
c)
Voltage drop
d)
Shunt Resistor
30.
What is the resistance of shunt resistor in Siemens analog input module.
a)
300 Ohm
b)
250 Ohm
c)
350 Ohm
d)
250 Kohm
31.
Which analog input Wiring methosh is separates the supply from the signal
a)
2-wire Analog Input
b)
3-wire Analog Input
c)
4-wire Analog Input
d)
All
32.
convert the raw value from the analog input to some sort of engineering value Is
a)
unscaling
b)
scaling
c)
both a and b
d)
none of these
33.
Example for engineering value is
a)
ampere
b)
volt
c)
resistence
d)
kg
34.
The block used for scaling in PLC is
a)
FC 107
b)
FC 106
c)
FC 105
d)
BC 105
35.
FC 105 has -------- inputs
a)
3
b)
2
c)
5
d)
4
36.
The range of Raw value in siemens plc is
a)
0-37650
b)
0-27648
c)
0-27248
d)
0-1024
37.
Example for Analog outputs for PLC are
a)
motor
b)
sensor
c)
valve
d)
both a and c
38.
PLC Analog outputs need ------------ Signal
a)
descrete signal
b)
pulse signal
c)
continous
d)
none of these
39.
Wiring of Voltage and Cureent IS same in PLC
a)
true
b)
false
c)
both a and b
d)
cant say
40.
Wiring of Voltage and Cureent is depends on
a)
input
b)
sensor
c)
plc
d)
load
41.
Volatage Output consist of how many terminal
a)
2
b)
3
c)
4
d)
1
42.
opposition that a circuit presents to changes in current or voltage
a)
flux
b)
density
c)
line impedence
d)
current
43.
opposition that a circuit presents to changes in current or voltage
a)
flux
b)
density
c)
line impedence
d)
current
44.
Two extra terminals are used in voltage analog output wiring
a)
for load
b)
for compensating
c)
for signal
d)
all of the above
45.
Minimum load impedance in Voltage wiring is
a)
500 Ohm
b)
1k ohm
c)
300 ohm
d)
500-1k ohm
46.
if we want to generate 8ma signal from plc what value should be given D to A converter
a)
7612
b)
8610
c)
6912
d)
13792
47.
The need of scaling function in PLC
a)
for processing
b)
to show the measurement on an HMI.
c)
It is convenient to work with the engineering value
d)
both a and c
48.
The need of unscaling function in PLC
a)
module can convert to an output
b)
for processing
c)
to show the measurement on an HMI.
d)
none of these
49.
Two extra terminals are used in voltage analog output wiring
a)
for load
b)
for compensating
c)
for signal
d)
all of the above
50.
Minimum load impedance in Voltage wiring is
a)
500 Ohm
b)
1k ohm
c)
300 ohm
d)
500-1k ohm
51.
Current Output consist of how many terminal
a)
2
b)
3
c)
4
d)
1
52.
The vertical lines of PLC ladder diagram is called
a)
Rung
b)
Rail
c)
branch
d)
nest
53.
The horizontal lines of PLC ladder diagram is called
a)
Rung
b)
Rail
c)
branch
d)
nest
54.
A normally-open type contact will __________ when its bit is 0 and ________ when its bit is 1:
a)
Open, Close
b)
close, open
c)
open,open
d)
close, close
55.
Which of the following is correct about contacts or coils seen in a Ladder Diagram PLC:
a)
All contacts and coils are real
b)
Contacts are real, while coils are programmed bits
c)
Coils are real, while contacts are programmed bits
d)
Both coils and contacts are bits in PLC memory
56.
When relay coil is energized it is said to be:
a)
picked up
b)
drop out
c)
Roll in
d)
none of the above
57.
The PLC’s can be programmed in _______
a)
ladder logic, structured text
b)
Instruction list, Functional block diagram
c)
Sequential function chart
d)
All of the above
58.
The instruction list plc programming language uses ________ code.
a)
c language code
b)
python
c)
Mnemonic code
d)
none of the above
59.
The structure text PLC programming language is denoted by _____
a)
ST
b)
SYNTXT
c)
STX
d)
BOTH ST AND STX
60.
Which are the programming method?
a)
Ladder diagram
b)
Functional block diagram
c)
Sequential function chart
d)
All of the above
61.
which one is the PLC programming language?
a)
HMI
b)
MMI
c)
FBD
d)
none of the above
62.
What is the standard form of IEC?
a)
International Electrotechnical commission
b)
Internation electrical commission
c)
International electronics commission
d)
none of the above
63.
what are the elements of ladder logic?
a)
NO
b)
NC
c)
BOTH A AND B
d)
none of the above
64.
What are the standard form of FBD?
a)
functional block diagram
b)
first block diagram
c)
functional block division
d)
none of the above
65.
The combination of series & parallel branches in the same or different Rungs are called ____
a)
Series
b)
parallel
c)
nest branch
d)
none of the above
66.
what is the abbreviation of Ladder diagram?
a)
LD
b)
LDR
c)
LDG
d)
LDM
67.
if one input is true, the output will also become true
a)
OR GATE
b)
AND GATE
c)
NOT GATE
d)
XOR GATE
68.
If both the inputs are true, then the output is also true
a)
AND gate
b)
NOT GATE
c)
NAND
d)
XOR GATE
69.
Which is the following is not a PLC programming language?
a)
laddar diagram
b)
Instruction list
c)
c language
d)
FBD
70.
The ladder logic of PLC consists of _____
a)
logic gates
b)
relays
c)
fuctional block
d)
relay coils and contacts
71.
which one is the oldest programming language?
a)
ladder logic
b)
Functional block diagram
c)
instruction list
d)
none of the above
72.
Advantages of ST PLC programming language
a)
Easier to understand
b)
High Flexibility
c)
Transferability
d)
All of the above
73.
A set of rules that sends and receives data between two or more communicating devices is called ________
a)
communication protocol
b)
Network
c)
Transmitter
d)
Receiver
74.
PPI Stands for_____________
a)
Parallel port interface
b)
prallel point interface
c)
Point to Point Interface
d)
Parallel to parallel interface
75.
MPI Stands for_____________
a)
Multi Port Interface
b)
Multi Point Interface
c)
Multi point Internet
d)
Multi post Internet
76.
PPI adaptor used in ______PLC Module
a)
S7 200
b)
S7 300
c)
S7 400
d)
S7 1200
77.
MPI adaptor used in ______PLC Module
a)
S7 200
b)
S7 300
c)
Both S7 200 & S7 300
d)
All Modules
78.
Baud rate is also known as
a)
protocols
b)
modules
c)
Communication speed
d)
NONE
79.
Baud rate for Ethernet communication protocol
a)
100Mb/s
b)
12Mb/s
c)
5Mb/s
d)
500Kb/s
80.
Network Length for Profibus communication protocol
a)
15Km
b)
50m
c)
100m
d)
30Km
81.
Number of Nodes for Device Net Communication protocol
a)
8
b)
16
c)
32
d)
64
82.
Network Length for Control Net Communication protocol
a)
15Km
b)
50m
c)
100m
d)
30Km
83.
protocol uses a Master/Slave technique to communicate between devices.
a)
Ethernet/IP and Ethernet TCP/IP
b)
Modbus RTU
c)
Modbus TCP/IP
d)
Profibus and Profinet
84.
Types of PLC Communication Protocols
a)
EtherNet/IP
b)
DirectNet
c)
ControlNet
d)
ALL
85.
IP Stands for_____________
a)
Internet point
b)
Internet Protocol
c)
Interface point
d)
Input
86.
TCP Stands for_____________
a)
Transmission Control Point
b)
Transister Control Protocol
c)
Transmission Control Protocol
d)
Transmission Circuit Protocol
87.
IEA Stands for_____________
a)
Industrial Electronics Association
b)
Industrial Ethernet Association
c)
Internet Ethernet Association
d)
Internet Electronics Association
88.
The communication protocols are dependent upon three fundamental parts ____ ____ ___
a)
baud rate, network length, and the number of nodes.
b)
speed , protocol and nodes
c)
Characteristics, Speed and nodes
d)
Node , Junctions and Speed
89.
Profibus Stands for_____________
a)
PROcess-FIeld-BUS
b)
Protocol
c)
Internet Bus
d)
Internet Protocol
90.
When Porfibus network operate at speed of 12 megabits per second. What is the cable length used in network.
a)
1000 meters
b)
50 meters
c)
100 meters
d)
500 meters
91.
When Porfibus network speed increases What happends to cable Length
a)
Increase
b)
Decrease
c)
No change
d)
All
92.
When Porfibus network speed increases What happends to cable Length
a)
Increase
b)
Decrease
c)
No change
d)
All
93.
The physical interface used for Profinet is a standard ____ Ethernet jack
a)
RJ-46
b)
RJ-48
c)
RJ-45
d)
RJ-47
94.
Common reasons why PLC control systems fail
a)
module failure
b)
power outages
c)
bad network connections
d)
ALL
95.
the engineer usually determines where the sequence has stopped by interrogating the software to ____Mode
a)
On-line
b)
Off line
c)
execution
d)
All
96.
Possible root cause for I/O module and input/output point problems.
a)
Configuration error
b)
Tripped circuit breaker
c)
Loose terminal block
d)
All
97.
Most of the cases the PLC fails due to following factors
a)
Module failure of the input/output (I/O).
b)
Problems with a field device
c)
Problems with the power supply
d)
All
98.
protecting both the PLC and maintenance personnel _____ is very Important
a)
Power supply
b)
Proper Grounding
c)
network connection
d)
Loose connection
99.
EMI stands for ____
a)
Electromechanic Interference
b)
Electronic Machine interference
c)
Electric Machine interference
d)
Electromagnetic Interference
100.
RFI stands for ____
a)
Resistor Frequency interface
b)
Radio filter interference
c)
Radio frequency interference
d)
Radio frequency Internet
101.
Source of Electromagnetic Interference
a)
High frequency devices
b)
Power lines
c)
Electric motors
d)
All
102.
Ligitning causes _____Electrical Noise interference
a)
Electromagnetic interference
b)
short circuit
c)
Tripped circuit breaker
d)
All
103.
The memory of a PLC can become corrupted due to
a)
frequency interference
b)
disruptions of power
c)
sudden loss of power
d)
All
104.
To avoid the possibility of power failure, the majority of today’s industrial facilities have ________________
a)
Preventing power failures
b)
Backup power sources.
c)
Regular check up
d)
Monitoring power system
105.
Identify the redundant power source for Back Up.
a)
UPS
b)
Current source
c)
DC Power Source
d)
AC Power Source
106.
Power failures can cause damage such as __________&__________.
a)
Short circuit And overheating
b)
hanging & Shut down
c)
System damage & Data loss
d)
Electronic circuit &damage
107.
On some PLCs, _________ are installed for prolonged power when a blackout hits.
a)
Current source
b)
DC Power Source
c)
AC Power Source
d)
Batteries
108.
To safeguard systems from communication network loss, engineers must ______ the connections between different system parts.
a)
randomly inspect
b)
not at all inspect
c)
rarely inspect
d)
regularly inspect
109.
PLC fails factors
a)
Module failure of the input/output (I/O).
b)
Problems with a field device.
c)
Problems with the power supply.
d)
ALL
110.
EMI
a)
Electromagnetic interference
b)
Electromechanical interference
c)
Electromotive induction
d)
ALL
111.
The memory of a PLC can become corrupted by
a)
frequency
b)
interference
c)
disruptions of power
d)
ALL
112.
What protecting both the PLC and maintenance personnel.
a)
Power
b)
grounding
c)
plc
d)
ALL
113.
RFI
a)
rasio frequency interference
b)
radio frequency interference
c)
radio form interference
d)
NONE
114.
Common reasons why PLC control systems fail
a)
module failure
b)
power outages
c)
bad network connections
d)
ALL
115.
the engineer usually determines where the sequence has stopped by interrogating the software to ____Mode
a)
On-line
b)
Off line
c)
execution
d)
All
116.
Possible root cause for I/O module and input/output point problems.
a)
Configuration error
b)
Tripped circuit breaker
c)
Loose terminal block
d)
All
117.
Most of the cases the PLC fails due to following factors
a)
Module failure of the input/output (I/O).
b)
Problems with a field device
c)
Problems with the power supply
d)
All
118.
protecting both the PLC and maintenance personnel _____ is very Important
a)
Power supply
b)
Proper Grounding
c)
network connection
d)
Loose connection
119.
To avoid the possibility of power failure, the majority of today’s industrial facilities have ________________
a)
Preventing power failures
b)
Backup power sources.
c)
Regular check up
d)
Monitoring power system
120.
Identify the redundant power source for Back Up.
a)
UPS
b)
Current source
c)
DC Power Source
d)
AC Power Source
121.
Power failures can cause damage such as __________&__________.
a)
Short circuit And overheating
b)
hanging & Shut down
c)
System damage & Data loss
d)
Electronic circuit &damage
122.
On some PLCs, _________ are installed for prolonged power when a blackout hits.
a)
Current source
b)
DC Power Source
c)
AC Power Source
d)
Batteries
123.
Most PLC control systems need to communicate with periphery devices such as __________
a)
Human Machine Interfaces (HMIs)
b)
Motors
c)
Robots
d)
Actuators
124.
A loss of communication between devices will often result in immediate_________
a)
Failure
b)
Fault
c)
Plant downtime
d)
short circuit
125.
The peripheral Devices and HMI's are connected with one another via___________cables
a)
Power cables
b)
Ethernet cables
c)
Long cable
d)
Optical cable
126.
To safeguard systems from communication network loss, engineers must ______ the connections between different system parts.
a)
randomly inspect
b)
not at all inspect
c)
rarely inspect
d)
regularly inspect
127.
A PLC system surrounded by ________ equipment could be at risk of failure if not properly safeguarded.
a)
sound system
b)
Heat emitting
c)
heavy machinaries
d)
instruments
128.
As facilities,________ should be set to a level that will keep the area around the PLC at a relatively low temperature
a)
The cooling setting
b)
Heat emitting device
c)
heavy machinaries
d)
instruments
129.
As a general rule, all equipment should be maintained at temperatures well below the maximum threshold specified by the________
a)
Customer
b)
Dealer
c)
Manufacturer
d)
Engineer
130.
A PLC can ________ when the internal status of code is incompatible with something that occurs on the outside.
a)
Cause power failure
b)
make main system off
c)
send signals
d)
malfunction or fail
131.
In order to reduce the possibility of PLC problems, facility engineers must follow ______ to ensure all parts are properly connected at all ends.
a)
randomly steps
b)
own method
c)
procedural steps
d)
other machine steps
132.
___________ is a device or software that is used to communicate with the machines or groups of machines in the plant or production area.
a)
Motors
b)
HMI - HMI (Human Machine Interface)
c)
Genarators
d)
Routers
133.
HMI is a device that can connect with the ______ on a network and gives all the information of process parameters as well as status of inputs and outputs without losing the integrity of PLC security.
a)
PLC
b)
switches
c)
Routers
d)
connectors
134.
_________can operate and monitor the machine from the HMI.
a)
MANAGER
b)
Customer
c)
An operator or maintenance personnel
d)
Directors
135.
The _________ software allows the engineer to design what the operator will actually see on the screen, what they can monitor on the screen, what “buttons” can be pushed, and how the operator can manipulate the machine.
a)
HMI
b)
PLC
c)
Camera
d)
Robot
136.
HMI is a _______ representation of what’s happening on the manufacturing floor.
a)
manual
b)
VISUAL
c)
super-imagined
d)
physical
137.
HMI's Have ______ Primary Roles
a)
ONE
b)
TWO
c)
THREE
d)
FOUR
138.
__________Operator interface Used in applications that require constant feedback and monitoring. HMI's that serve as data handlers come equipped with large capacity memories
a)
Text panels
b)
manual
c)
system supervision
d)
data handling
139.
________interface works with SCADA (Supervisory Control And Data Acquisition) and MES (Manufacturing Execution System) to display information.
a)
Text panels
b)
manual
c)
system supervision
d)
data handling
140.
Hard wired push buttons and indicator lights were replaced by __________, Which had membrane push buttons on them.
a)
Text panels
b)
manual
c)
system supervision
d)
data handling
141.
For applications that require constant feedback from your company's system or printed production reports, the ____________ is the perfect HMI.
a)
Text panels
b)
data handler
c)
manual
d)
system supervision
142.
Text panels were replaced by _______ which had good screen resolution and touch screen controls on them
a)
switches
b)
routers
c)
graphical displays
d)
connectors
143.
_________ in SCADA / HMI is very useful to track, monitor, calculate, to diagnose useful process parameters from the past saved trend data.
a)
Trends
b)
switches
c)
routers
d)
connectors
144.
__________ are the graphs that display the values of data in real-time and the graph updates for every instant of time we have specified.
a)
old charts
b)
Real-time Trends
c)
Historical Trends
d)
graphs
145.
__________are used to display the data in real-time at the same time the old data can be retrieved and viewed on the run time.
a)
old charts
b)
Real-time Trends
c)
Historical Trends
d)
graphs
146.
In HMI wiring while connecting the Power supply Ensure correct______
a)
polarity
b)
non polarity
c)
bi-polarity
d)
uni-polarity
147.
In HMI wiring while Connecting a programming device to a Basic Panel DP _______ the HMI device.
a)
restarts
b)
Shut down
c)
close the software
d)
switch on
148.
_________are used to connect the configuration PC
a)
Power cables
b)
optical cables
c)
CAT5 Ethernet cable
d)
fibre cables
149.
Which communication protocol is compatible to connect HMI & PLC
a)
Modbus
b)
Ethernet/IP
c)
Profibus
d)
All
150.
KPT700 Basic SIMATIC Basic panel
a)
7 Inch Display
b)
6 Inch Display
c)
8 Inch Display
d)
5 Inch Display
151.
The standard form of MMI is
a)
Main Machine Interface
b)
Master Machine Interface
c)
Man Machine Interface
d)
None of the above
152.
________ is one type of human machine interface
a)
Monochrome or coloured
b)
Screens with keypad or touch screens
c)
Both a and b
d)
None of the above
153.
The human machine interface information like _________
a)
Temperature, pressure
b)
Running time, material counts
c)
The process steps
d)
All
154.
The human machine interface can be used to monitor and control various locations such as ________
a)
Engine assembly, vehicle assembly
b)
Machine shops
c)
Paint shops
d)
All
155.
HMI is very useful to track, monitor, calculate, to diagnose useful process parameters from the past saved_____
a)
Trending data
b)
HMI
c)
Alarms
d)
All
156.
An HMI can allow plant operators to locate a malfunction in the equipment by viewing
a)
Alarms
b)
digital screen
c)
Messages
d)
System
157.
data saving feature is a advantage of
a)
HMI
b)
PLC
c)
Profibus
d)
Network
158.
______can reduce operating costs by replacing hundreds of selectors, pushbuttons, indicator lights and more
a)
human machine interface
b)
PLC
c)
Automation
d)
switch
159.
Advantages of HMI
a)
Cost Reduction
b)
Data saving
c)
Alarms/Warnings
d)
All
160.
Applications of HMI
a)
Automotive
b)
Energy
c)
Food and Beverage
d)
All
161.
Applications of HMI
a)
Manufacturing
b)
Military and Aerospace
c)
Medical
d)
All
162.
Applications of HMI
a)
Recycling
b)
Power
c)
Oil and Gas
d)
All
163.
Applications of HMI
a)
Robotics
b)
Water and Wastewater
c)
Manufacturing
d)
All
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