মাইক্রোকন্ট্রোল এন্ড পিএলসি MCQ
1. 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
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
3. 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
4. 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
5. 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
6. 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
7. 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
8. The PLC is used in
machine tools
automated assembly equipment
moulding and extrusion machines
all of the above
9. 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
10. 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
11. . 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
12. Most World Wide Web pages contain commands in the language of-
NIH
HTML
URL
IRC
13. Which of the following cannot be an input that is given to the PLC?
Manual switches
Relay
Sensors
None of the above
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
15. Which one is used to close a running document?
alt + W
ctrl+S
ctrl + A
none
16. In a memory-mapped I/O system, which one is not present?
LDA
IN
ADD
OUT
17. Which one can be used for read?
RAM
ROM
Both (a) & (b)
none
18. 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
19. -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
20. 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