Q-Which of the following cannot be an input that is given to the PLC?
a. Manual switches
b. Relays
c. Sensors
d. None of the above


ANSWER: None of the above


Q-Which of the following can be the output of PLC?

1. Relay coils
2. Solenoids
3. Indicators
4. Motors
5. Lamps
6. Alarms

a. Only (1), (2), (3) and (4)
b. Only (3), (4), (5) and (6)
c. Only (1), (2), (3) and (5)
d. All the (1), (2), (3), (4), (5), and (6)


ANSWER: All the (1), (2), (3), (4), (5), and (6)


Q-The PLC is used in _______.

a. machine tools
b. automated assembly equipment
c. moulding and extrusion machines

d. all of the above


d. all of the above



Q-PLC can be ___________ in plant to change the sequence of operation.

a. only programmed
b. only reprogrammed
c. programmed and reprogrammed
d. able to give a set point


ANSWER: programmed and reprogrammed


Q-__________ of PLCs can be done in very little time.

a. Programming
b. Installation
c. Commissioning
d. All of the above


ANSWER: All of the above


Q-How is the noise immunity of PLCs to electrical noises as compared to that of conventional relay controllers?

a. poor
b. excellent
c. as good as noise immunity of conventional relay controllers
d. unpredictable


ANSWER: poor


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