Computer Aided Manufacturing (3161917) MCQs

MCQs of Programmable Logic Controllers

Showing 21 to 30 out of 35 Questions
21.

In PLC, a digital counter consists of 

(a)

a count register

(b)

an accumulator

(c)

a relay contact

(d)

all of the mentioned

Answer:

Option (d)

22.

The accumulator is used to either increment or decrements a count each time an input pulse is received.

(a)

True

(b)

False

Answer:

Option (a)

23.

When the accumulator value equals the register value, the relay contact is

(a)

deactivated

(b)

activated

(c)

remain the same

(d)

can’t predict

Answer:

Option (b)

24.

Memory size in a PLC is measured in either bits, bytes or words.

(a)

Correct

(b)

Incorrect

Answer:

Option (a)

25.

Volatile memory of PLC maintains the information in memory even if the power is interrupted.

(a)

True

(b)

False

Answer:

Option (b)

26.

Peripherals are used in PLC to

(a)

program the PLC

(b)

prepare the program listing

(c)

back up the program

(d)

All of the mentioned 

Answer:

Option (d)

27.

Which is the type of PLC peripheral?

(a)

Operator console

(b)

Printer

(c)

Simulator

(d)

All of the mentioned

Answer:

Option (d)

28.

Which is not the type of PLC peripheral?

(a)

Network communication interface

(b)

EPROM loader

(c)

RAM loader

(d)

PC-based programming software

Answer:

Option (c)

29.

__________ is a means of graphically representing the logic required in a relay logic system.

(a)

C++

(b)

Ladder diagram

(c)

OOP+

(d)

VHDL

Answer:

Option (b)

30.

Power flows from the left rail to the right rail, and each rung must have an output to prevent a short.

(a)

Agree

(b)

Disagree

Answer:

Option (a)

Showing 21 to 30 out of 35 Questions