AST-trial-EXAM-1
Decide whether each of these statements is True (T) or False (F).A relay output channel from a PLC:(i) Is used for only d.c. switching.(ii) Can withstand transient overloads. Which option BEST describes the two statements?
(i) F (ii) T
The programmable logic controllers are used in __________.
1. Glass and paper industry 2. Process automation plants 3. Cement manufacturing
Convert denary number 100 to binary number: 100
110 0100
Convert octal 701 to binary
111000001
Convert hexadecimal number9F to denary number:
159
The hexadecimal equivalent of a binary 00100011 is __
23
Convert hexadecimal number D53 to denary number:
3411
Which of the following is most likely to be the voltage level used internally in a PLC, excluding the voltage levels that might occur during conditioning in output/input channels:
5V
Exclusive-OR (XOR) logic gates can be constructed from _________logic gates.
AND gates, OR gates, and NOT gates
Who invented the Programmable Logic Controller (PLC)?
Dick Morley
The form of training used to enforce the rules of organization is classified as
Discipline
The most popular language for PLCs is:
Ladder diagram
the term PLC stands for?
Programmable Logic Controller
System busses
The internal paths along which the digital signals flow within the PLC
What is Direct Current (DC)?
a flow of electrons along a circuit in one direction
Electric circuits are created in order to:
to perform a specific function
Decide whether each of these statements is True (T) or False (F).The reason for including optocouplers on input/output units is to:(i) Provide a fuse mechanism which breaks the circuit if high voltages or currents occur.(ii) Isolate the CPU from high voltages or currents. Which option BEST describes the two statements?
(i) F (ii) T
Decide whether each of these statements is True (T) or False (F). A limit switch:(i) Can be used to detect the presence of a moving part.(ii) Is activated by contacts making or breaking an electrical circuit.
(i) T (ii) T
Decide whether each of these statements is True (T) or False (F).A transistor output channel from a PLC:(i) Is used for only d.c. switching.(ii) Is isolated from the output load by an optocoupler. Which option BEST describes the two statements?
(i) T (ii) T
When an input signal 1 is applied to a NOT gate, the output is
0
The change in resistance of an electrical resistance strain gauge with a gauge factor of 2.0 and resistance 100 ( when subject to a strain of0.001 is:
0.2 ohms
A technology for the application of mechanical, electronics and computer-based systems to control and operate the systems is called
Automation
It may allow arithmetic operations, logic operators, block memory moves, computer interface, local area network, functions, etc.
CPU
In this control system, small components are attached to the industrial computer system with the help of a network and control is exercised.
DCS
The advantages of PLC are ____
Easy maintenance Reliability is high Small in size
The advantages of PLC are ______
Easy maintenance Reliability is high Small in size
What are the types of programmable logic controllers?
Fixed and modular PLC
The programmable logic controllers are used in __________
Glass and paper industry Cement manufacturing Process automation plants
Burns, cuts, electrical shock, amputation and absorption of chemicals are examples of hazards associated with arm injuries that's why we need a kind of protection.
Hand protection
The following are disadvantages of PLC control EXCEPT:
Have interfacing for inputs and outputs already inside the controller.
Which of these benefits of 6S are of value to your company?
Improved employee morale Improved safety Increased productivity Increased profitability
Which is not a benefit of Sort?
Improved machine dependability
What are the components that make the programmable logic controller work?
Input and output module CPU Power supply
Which one is NOT a benefit of Shine?
Inventory reduction
A NAND gate has ______ inputs and _______output.
LOW inputs and HIGH outputs
Which of these devices is a key part of a software program that controls the operations of the program?
Logic controls
This is where information is stored on the status of input and output devices and the values of timers and counters and other internal devices.
Memory
A diaphragm pressure sensor is required to give a measure of the gauge pressure present in a system. Such a sensor will need to have a diaphragm with:
One side open to the atmosphere. .
A circuit in which if one load fails, the others will still receive power and continue to function is called a:
Parallel circuit
Below are the main components of Programmable Logic Controller
Power Supply CPU I/O modules
It is an electronic device used in many industries to monitor and control construction systems and production processes.
Programmable Logic Controller
Which item is not a part of the Sort phase?
Putting tools at the point of use
A unit called Ohms is used to measure:
Resistance
What do you mean by SCADA?
Supervisory Control and Data AC
One of 6's means developing communication strategies and getting everyone involved while implementing daily auditing through daily workplace observation and displaying the daily scan diagnostic in a public place for all to see.
Sustaining
The internal paths along which the digital signals flow within the PLC
System busses
Memory
This is where information is stored on the status of input and output devices and the values of timers and counters and other internal devices.
What is the purpose of the policies and procedures
To help us act and behave professionally with each other, with customers and the environment
The following are advantages of PLC control EXCEPT
Too much work required in connecting wires.
It is usually the central part of a process control system.To run more complex processes it is possible to connect more PLC controllers to a central computer.
Traditional PLC
Below are the main components of Programmable Logic Controller EXCEPT
Traffic control
A common tool that specifies how a logic circuit's output depends on the logic levels present at the inputs?
Truth tables
Which of the following is the Boolean expression of the OR gate output?
X=A+B
included in a basic electric circuit?
a switch a load a power source a conductor
We measure current in a standard unit called
amperes
It is a mathematic system of logic in which truth functions are expresses as symbols and then these symbols are manipulated to arrive at conclusion
boolean algebra
When current flows around a complete electrical connection from one end to the other, it is a:
closed circuit
The outputs depends only on the current values of the input variables?
combination logic
An electric circuit is a configuration of:
components, wires and electricity
The function of a resistor is to:
control the flow of current to other components in a circuit
The only function of NOT gate is to
invert input signal
It is a logic gate whose output is the inverse or complement of its input.
inverter
Any number with an exponent of one is equal to
itself
Any number with an exponent of zero is equal to
one
Inductance is the tendency of an electrical conductor to:
oppose a change in the electric current flowing through it
The different electronic components in a circuit are connected using:
printed circuit board
The output can depend on present and also past values of the input and the output variables?
sequential logic
One of 6's which means physically cleaning and removing reasons for contamination, dust, debris, oil, etc.
shine
6's which means identifying needed items from items that are simply cluttering or are unnecessary to the process.
sorting
The function of a capacitor is to:
store energy in an electric circuit
What is voltage?
the difference in electrical potential between two places along an electrical circuit
Normally open contacts are open when:
when in put is not energized