মাইক্রোকন্ট্রোল এন্ড পিএলসি MCQ
1. What is the largest integer number that a PLC counter function can reach if it uses a 16-bit register?
The largest integer number that a PLC counter function can reach if it uses a 16 bit register is 65.535
32,768
65.535
65.536
65.537
2. ---is a system which is used to direct, command or regulate itself or another system.
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
Control system
Open loop control system
Closed loop control system
None of the above
3. Which one is used to close a running document?
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.
alt + W
ctrl+S
ctrl + A
none
4. . From which of the following control system has feedback available?
Closed loop control system has feedback available.
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
5. Which one can be used for read?
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
RAM
ROM
Both (a) & (b)
none
6. Current limiting reactors in power system have-
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
large resistance and low reactance
large reactance and low reactance
large reactance and resistance
low reactance and resistance
7. A good application for a timed interrupt in a PLC program would be-
A good application for a toned interrupt in a PLC Program wouldbe A PID function black.
A communications function block
A PID function block
A math function block
A motor start/stop rung
8. Most World Wide Web pages contain commands in the language of-
HTML- হলো একটি অত্যাধুনিক ইন্দ্র Browser. HTML-এর পূর্ণরূপ হলো- Hypertex Multiple Languages.
NIH
HTML
URL
IRC
9. যে টাইমার একটি নির্দিষ্ট সময় পর টার্ন-অফ হয় অর্থাৎ টার্ন-অফ হওয়ার পূর্বে একটি নির্ধারিত সময় পর্যন্ত টার্ন- অন থাকে, তার নাম কী?
যে টাইমার একটি নির্দিষ্ট সময় পর পর টার্ন-অফ হয়, তাকে অফ-ডিলে টাইমার বলে।
অন-ডিলে টাইমার
অফ-ডিলে টাইমার
ক্যাসকেড টাইমার
কোনোটিই নয়
10. Which of the following cannot be an input that is given to the PLC?
Manual switches
Relay
Sensors
None of the above
11. An OR function implemented in ladder logic uses
An OR function implemented in ladder logie. Uses Normally-Open contacts in parallel.
Normally-closed contacts in series
Normally-open contacts in series
A single normally-closed contact
Normally-open contacts in parallel
12. PLC can be in plant to change the sequence of operation.
No explanation is available for this question.
only programmed
only reprogrammed
programmed and reprogrammed
able to give a set point
13. In PLC programming, a retentive function is one that-
in PLC Programming, a retentine function is One that is not reset afier a Power loss.
Defaults to the "on" state
Comes last in the program
Cannot be edited or deleted
Is not reset after a power cycle
14. -is an automatic device that uses error signal to correct the performance of a mechanism.
Servo control 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
15. The PLC is used in
The PLC is Used in machine tools, automated assembly equipment, moulding and extrusion machines.
machine tools
automated assembly equipment
moulding and extrusion machines
all of the above
16. In a PLC, the scan time refers to the amount of time in which-
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.
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
17. From the following which control system is simple and cheap?
Open loop control system is a simple and cheap type of control system
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
18. In a memory-mapped I/O system, which one is not present?
In memory-mapped 100 devices and the memory share the same address space.
LDA
IN
ADD
OUT
19. Which of the following is a type of control system?
There are two common control loop systems Used in industrial Processes. They are the Open Loop system and the closed loop system.
Closed loop control system
Open loop control system
Both (a) & (b)
None of the above
20. The difference between online and offline PLC
The difference between online and offline Programming. Where the edited Program resides,
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