ALL THE BEST!!!
PLC-HOAGRA-21ST AUGUST2024
1 / 50
The main difference between online and offline PLC programming is
2 / 50
One of the following has tendency to oscillate
3 / 50
Which of the following statements about a single pole double throw relay NOT true ?
4 / 50
A good control system has all the following features except
5 / 50
Memory size in a PLC is measured in either bits, bytes or words.
6 / 50
In electrical-pneumatic system analogy the current is considered analogous to
7 / 50
Electronic soft starters are used for motors to:
8 / 50
An OR function implemented in ladder logic uses
9 / 50
Which of the following statements is not correct?
10 / 50
Which of the following RLL applications is not normally perfomed in early automation systems ?
11 / 50
In pneumatic control systems the control valve used as final control element converts
12 / 50
A control system working under unknown random actions is called
13 / 50
The initial response when the output is not equal to input is called
14 / 50
Very often relays and valves are connected to
15 / 50
When a relay is NOT energized:
16 / 50
Any externally introduced signal affecting the controlled output is called a
17 / 50
The capacitance , in force-current analogy, is analogous to
18 / 50
Which one of the following increases the steady state accuracy.
19 / 50
Current flows into the………………………………..
20 / 50
A closed loop system is distinguished from open loop system by which of the following ?
21 / 50
In a PLC “I” is used for output and “Q” is used for input
22 / 50
The type of memory which is fast and temporarily stores the data which are immediately required for use is called as______.
23 / 50
Which one of the following in not a final control element.
24 / 50
How is the speed of operation of the conventional relay system compared to digital controllers?
25 / 50
Which of the following statements is correct ?
26 / 50
PLC can be ___________ in plant to change the sequence of operation.
27 / 50
The effect of error damping is to
28 / 50
PLC stands for programmable logo controller
29 / 50
Which of the following is the definition of proportional band of a controller ?
30 / 50
To increase the number of inputs and outputs of the PLC, one can use expansion modules.
31 / 50
Parallel connections of a ladder logic program are typically called
32 / 50
Which of the following cannot be an input that is given to the PLC?
33 / 50
Eddy current drive can be a retrofit for ____________
34 / 50
Volatile memory of PLC maintains the information in memory even if the power is interrupted.
35 / 50
The d.c. series motor should always be started with load because
36 / 50
Which of the following is an open loop control system ?
37 / 50
The temperature, under thermal and electrical system analogy, is considered analogous to
38 / 50
The basic functions of electronic ballast excludes one of the following
39 / 50
40 / 50
PLC, s are………………………………….designed for use in the control of a wide varity of manufacturing machine and system.
41 / 50
Which of the following statements about RLL is NOT true ?
42 / 50
Which of the following is the output of a thermocouple ?
43 / 50
In liquid level and electrical system analogy, voltage is considered analogous to
44 / 50
Which one of the following is the reference input minus the primary feedback.
45 / 50
In open loop system
46 / 50
Which of the following statements about a single pole double throw relay is true ?
47 / 50
The ………………………………….. is moved toward the relay electromagnet when the relay is on.
48 / 50
The PLC is used in _______.
49 / 50
Which of the following should be done to make an unstable system stable ?
50 / 50
When a synchronous motor is running at synchronous speed. The damper winding produces
