1) Which architectural unit/block of PLC decides the sequence of different operations to be executed by means of instructions written in memory?
a. Memory
b. Programming software
c. I/O interface
d. CPU
|
Answer
Explanation
|
ANSWER: CPU
Explanation:
No explanation is available for this question!
|
|
2) Which among the following units of PLC is adopted to convey the control plan to CPU?
a. Memory
b. Power supply unit
c. I/O interface
d. Programming software
|
Answer
Explanation
|
ANSWER: Programming software
Explanation:
No explanation is available for this question!
|
|
3) How many digital inputs are present in PLCs?
a. 4
b. 8
c. 16
d. 32
|
Answer
Explanation
|
ANSWER: 16
Explanation:
No explanation is available for this question!
|
|
4) Which is the correct sequence of operational steps necessary for proper operation of an elevator (lift) control mechanism?
1. Up switch
2. Stop switch
3. Down switch
4. Start switch
a. 1-2-3-4
b. 2-1-4-3
c. 4-2-1-3
d. 3-1-2-4
|
Answer
Explanation
|
ANSWER: 4-2-1-3
Explanation:
No explanation is available for this question!
|
|
5) In addition to storage instructions, PLC controls __________
a. Logic sequence timing
b. Counting
c. Arithmetic operations
d. All of the above
|
Answer
Explanation
|
ANSWER: All of the above
Explanation:
No explanation is available for this question!
|
|
6) In P-D controller, the derivative action plays a significant role in increasing _______ of response.
a. Time
b. Distance
c. Speed
d. Volume
|
Answer
Explanation
|
ANSWER: Speed
Explanation:
No explanation is available for this question!
|
|
7) In P-I controller, what does an integral of a function compute?
a. Density of curve
b. Area under the curve
c. Volume over the curve
d. Circumference of curve
|
Answer
Explanation
|
ANSWER: Area under the curve
Explanation:
No explanation is available for this question!
|
|
8) Which controller has the potential to eliminate/overcome the drawback of offset in proportional controllers?
a. P-I
b. P-D
c. Both a and b
d. None of the above
|
Answer
Explanation
|
ANSWER: P-I
Explanation:
No explanation is available for this question!
|
|
9) Which time is responsible for introducing an error in the temperature regulation of applications associated with ON-OFF controllers?
a. Rise time
b. Dead time
c. Switching time
d. Decay time
|
Answer
Explanation
|
ANSWER: Dead time
Explanation:
No explanation is available for this question!
|
|
10) If an error signal e(t) of an ON-OFF controller is found to be greater than zero, what would be its output?
a. 10%
b. 50%
c. 80%
d. 100%
|
Answer
Explanation
|
ANSWER: 100%
Explanation:
No explanation is available for this question!
|
|
