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MCQ
1. In PLC programming, a retentive function is one that-
Defaults to the "on" state
Comes last in the program
Cannot be edited or deleted
Is not reset after a power cycle
in PLC Programming, a retentine function is One that is not reset afier a Power loss.
2. ---is a system which is used to direct, command or regulate itself or another system.
Control system
Open loop control system
Closed loop control system
None of the above
A control system manages, contmands, directs, regulates the behavior of other devices or rystos using Control loops. It can range from a single l heating controller using a thermostat controlling a domestic boiler to large industrial contro ryster which are used for controlling Processes or machines
3. The PLC is used in
machine tools
automated assembly equipment
moulding and extrusion machines
all of the above
The PLC is Used in machine tools, automated assembly equipment, moulding and extrusion machines.
4. From the following which control system is simple and cheap?
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
Open loop control system is a simple and cheap type of control system
5. In a memory-mapped I/O system, which one is not present?
LDA
IN
ADD
OUT
In memory-mapped 100 devices and the memory share the same address space.
6. What is the largest integer number that a PLC counter function can reach if it uses a 16-bit register?
32,768
65.535
65.536
65.537
The largest integer number that a PLC counter function can reach if it uses a 16 bit register is 65.535
7. An OR function implemented in ladder logic uses
Normally-closed contacts in series
Normally-open contacts in series
A single normally-closed contact
Normally-open contacts in parallel
An OR function implemented in ladder logie. Uses Normally-Open contacts in parallel.
8. Most World Wide Web pages contain commands in the language of-
NIH
HTML
URL
IRC
HTML- হলো একটি অত্যাধুনিক ইন্দ্র Browser. HTML-এর পূর্ণরূপ হলো- Hypertex Multiple Languages.
9. A good application for a timed interrupt in a PLC program would be-
A communications function block
A PID function block
A math function block
A motor start/stop rung
A good application for a toned interrupt in a PLC Program wouldbe A PID function black.
10. Which of the following is a type of control system?
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
There are two common control loop systems Used in industrial Processes. They are the Open Loop system and the closed loop system.
11. Which one can be used for read?
RAM
ROM
Both (a) & (b)
none
RAM stands for Random Access Memory. RAM data is volatile. Data is present till power supply is present. Rom stands for Read Only Memory. Rom data is permanent. Not requiring power to store dam
12. . From which of the following control system has feedback available?
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
Closed loop control system has feedback available.
13. যে টাইমার একটি নির্দিষ্ট সময় পর টার্ন-অফ হয় অর্থাৎ টার্ন-অফ হওয়ার পূর্বে একটি নির্ধারিত সময় পর্যন্ত টার্ন- অন থাকে, তার নাম কী?
অন-ডিলে টাইমার
অফ-ডিলে টাইমার
ক্যাসকেড টাইমার
কোনোটিই নয়
যে টাইমার একটি নির্দিষ্ট সময় পর পর টার্ন-অফ হয়, তাকে অফ-ডিলে টাইমার বলে।
14. PLC can be in plant to change the sequence of operation.
only programmed
only reprogrammed
programmed and reprogrammed
able to give a set point
No explanation is available for this question.
15. In a PLC, the scan time refers to the amount of time in which-
the technician enters the program
timers and counters are indexed by
one "rung" of ladder logic takes to complete
the entire program takes to execute
transmitted data communications must finish
PLC Scan Time is the time token by tye PLC to read the inputs. Solve the logic and update the output is called a PLC Scan Time. This time is measured in millisecond.
16. Which one is used to close a running document?
alt + W
ctrl+S
ctrl + A
none
List of basic word shortcut keys Ctrl+S = Save Ctrl+A = Select all contents of the page. Ctrl+W = Close document. Alt+F4 = Close current open program Al + W = Open the view tab.
17. Current limiting reactors in power system have-
large resistance and low reactance
large reactance and low reactance
large reactance and resistance
low reactance and resistance
The current limiting reactor is an inductive reactances in comparison to their resistance is used for limiting short circuit currents during fault conditions. Current-voltage reactors also reduced the voltage disturbances on the rest of the system
18. -is an automatic device that uses error signal to correct the performance of a mechanism.
Auto-mechanism
Servo mechanism
Servo control
None of the above
Servo control is an automatic device that uses error signal to correct the Performance of a mechanism .
19. Which of the following cannot be an input that is given to the PLC?
Manual switches
Relay
Sensors
None of the above
20. The difference between online and offline PLC
programming is whether the PLC is running or stopped
whether the programming PC has internet connectivity
the type of programming cable used
where the edited program resides
The difference between online and offline Programming. Where the edited Program resides,