WorksheetsPLC and Timer Concepts Quiz
Total questions: 52
Worksheet time: 26mins
Address O1: 02/00, in which ‘:’ is known as__________.
Bit delimiter
File delimiter
Rack No.
File No.
Address I1: 02/00, in which ‘I’ is known as__________.
Terminal No.
File Type
Rack No.
File No.
Address O1: 02/00, in which ‘/’ is known as__________.
Bit delimiter
File delimiter
Rack No.
File No.
The main difference between a TON and a TOF timer is ___________
TON maintains accumulated time on loss of power to rung logic while TOFF cannot.
TOFF maintains accumulated time on loss of power to rung logic while TON cannot.
TOFF timer begins timing when logic continuity, to rung is lost and TON begins timing when logic continuity to rung is maintained
TON timer begins timing when logic continuity to the timing rung is lost and TOFF viceversa
The______ specifies at what rate the timer will increment
preset time
base time
reset time
rise time
A _________timer initiates an action at a specified time after enable input is made low.
ON delay timer
OFF delay Timer
Retentive timer
Pulse repetitive Timer
For Retentive timers ________input is mandatory.
Enable
Marker relay
Reset
Active
A timer that initiates an action at a specified time after enable input is made high is called ________.
ON delay timer
OFF delay Timer
Retentive timer
Pulse repetitive Timer
single input timer is called __________.
Non retentive
Retentive
Pulse timer
Pulse repetitive Timer
The major advantage of retentive timer is __________.
It has only one input
It looses accumulated time
It has only on delay
It retains accumulated time
Suppose you need to select a module to inter face out going AC or DC,two state, ON/OFF, or OPEN/CLOSED outgoing signals.Which will you choose
discrete output module
analog output module
discrete input module
Analog input module
Suppose you need to select a module to interface a continuously changing incoming voltage or current signal.which will you choose
analog input module
analog output module
discrete input module
combination of Analog and discrete input module
A discrete input module which can be interfaced is ___________
push buttons
Horn
contactor
Pilot lamp
Volatile memory is__________
RAM
ROM
PROM
EEPROM
Nonvolatile memory is________
RAM
ROM
PROM
EEPROM
The processor in any PLC is designed to perform specific duties in a specific sequence and then continuously repeat the sequence.The operating cycle is called __________
Access time
Operating system
Scan Cycle
scan time
The scan consists of a series of sequential operations which include, Reading________, program execution, data output
connection
Input
Output
Tie point
If the input devices change its state while the processor is in program scan or output scan of the scan cycle then the plc will _____________
Immediately react to them
React during the next scan cycle
Response very slow
Does not react to them
If two NC contacts are connected in series that satisfies _______Gate logic
AND
NAND
OR
NOR
NC contact can be used to satisfy ________gate condition.
NOT
OR
AND
NOR
If two NO contacts are connected in series that satisfies _______Gate logic.
OR
NAND
NOR
AND
If two NC contacts are connected in parallel that satisfies _______Gate logic.
AND
NAND
OR
NOR
The logical OR function is similar to connecting two NO contacts in _____________
parallel
series
Direct reversal
Indirect reversal
Status of input devices are stored in ________ Register.
Output single
Input single
Output group
Input group
Each instruction on a ladder diagram has a reference number associated with it which is_________
Its instruction comment
Its position identifier on the ladder rung
a number referencing the instructions associated input status table bit addrress
the instructions input address
Holding register is also known as_______.
Input register
Output Register
Working Register
Group Register
The abbreviations NO and NC represents the electrical state of switch contacts when_______________.
Power is applied
Power is not applied
The switch is actuated
The switch is not actuated
NC push button connected in hardware & NC contact in software then the coil connected to the NC contact will be ___________
ON
OFF
Short
Toggle
A limit switch is usually actuated by_________.
Hand
Pressure
Contact with an object
An electromagnet
A thermocouple ,when heated _______
Produces a small dc voltage
Increases its resistance value
Produces a small AC voltage
Decreases its resistance value
A________converts electrical pulses applied to it into discrete rotor movement
Tachometer
Solenoid
Stepper motor
Electronic magnetic flow meter
Digital I/O modules operate on___________
24V AC supply
24V DC supply
5V AC supply
12V DC supply
PNP type proximity sensor is compatible with __________ input module.
Sourcing
Sinking
AC
DC
NPN type proximity sensor is compatible with __________ input module
sourcing
sinking
AC
DC
Discrete input modules accept signals from field devices that are________
Analog type
Digital Type
Two-state Type
Digital or Two state type
A discrete input signal is considered valid if the signal is________
Is a two-state signal
Is successfully change from AC to DC through the bridge rectifier
For an AC signal, if it is between 80 & 132 VAC
If it is continous
Thumbwheels switches provide input to the PLC in _______ format
BCD
Binary
DECIMAL
Hexadecimal
Discrete output interface modules send signals to field devices that are__________
Digital devices
Analog devices
Two-state devices
Digital or Two state Device
Discrete output modules act as a _________ to control output field devices
Relay
Switch
Contactor
solenoid
Typical discrete output devices include_______
Servo Motor
Inductive proximity switches
Solenoids
LVDT
Changing signals like temperature control or the 4 to 20-milliamp-speed reference for a variable-frequency drive are called ______ signals
analog input
digital input
analog output
digital output
Suppose you need to select a module to interface AC or DC, two-state, ON/OFF, or OPEN/CLOSED incoming signals.which will you choose
analog input module
analog output module
discrete input module
combination of Analog and discrete input module
PLC has replaced__________
Transistor
Computer
Relay Logic
Solenoid
Disadvantage of PLC is _________
Security
Documentation
Fixed program application
Pilot running
PLC stands for_______
Programmable Ladder Controller
Program Low Controller
Programmable Logic Controller
Programmable Logic Converter
If the I/O Count of PLC is between 32 to 128 then it is called as ___________.
Micro PLCs
Medium PLCs
Small PLCs
Large PLCs
Output modules are available in various switching and _______configurations.
AC
DC
Relay
Transistor
The devices connected to PLC for sending status information are called _______field devices.
Programmer and monitoring
Memory
Output
Input
Hand held terminals is an example for___________.
CPU
Input Module
output Module
Programmer and monitoring
In PLC the user program is stored in ________ memory.
ROM
PROM
EPROM
EEPROM
Input modules provide an interface between ______________and_____________.
Input connections and the CPU
Field equipment and the CPU
Output modules and field devices
The CPU and output modules
PLC I/O systems provides an interface between __________ and ___________.
Input devices and the CPU
Field equipment and the CPU
Output modules and field devices
Input modules and output modules
