PLC Chapter 1 Questions With All Correct &
Verified Answers
1.Programmable logic controllers are used to control .
A. robots
B. electric motors
C. conveyors
D. All of the above: D. All of the above
2.PLCs were first introduced in the .
A. automotive industry
B. power industry
C. process industry
D. None of the above: A. automotive industry
3.PLCs are designed to replace .
A. microprocessors
B. microcontrollers
C. electromechanical relay panels
D. desktop computers: C. electromechanical relay panels
4.Which of the following component(s) can be found in a PLC?
A. central processing units
B. input/output ports
C. power supply
D. All of the above.: D. All of the above.
5.The first PLC was built by .
A. General Motor
B. Allen-Bradley
C. Siemens
D. IBM: A. General Motor
6.Which of the following is part of the central processing unit (CPU)?
A. RAM and ROM memory units
B. Microprocessor
C. Support chips
D. All of the above.: D. All of the above.
7.A microprocessor has a(n) .
A. arithmetic logic unit (ALU)
B. decode unit
C. data and instruction cache
D. All of the above.: D. All of the above.
8.Changing relay logic requires .
A. rewiring the relays
B. changing input port names
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, PLC Chapter 1 Questions With All Correct &
Verified Answers
C. changing output port addresses
D. None of the above: A. rewiring the relays
9.An advantage of changing a relay logic circuit over a PLC logic control is
.
A. it is less expensive
B. it is less time consuming to program
C. it has less current capability
D. None of the above.: D. None of the above.
10.Static RAM .
A. requires more space than dynamic RAM on the PLC motherboard
B. is more expensive than dynamic RAM
C. requires more transistors and has faster response than dynamic RAM
D. All of the above: D. All of the above
11.Which of the following statements is false?
A. EPROM can be programmed several times.
B. EEPROM can be programmed several times.
C. Flash ROM can be programmed several times.
D. Masked ROM can be programmed several times.: D. Masked ROM can
be programmed several times.
12.Which of the following statements is false?
A. Optoisolators are used to protect CPU from high voltage in the input port
B. Optoisolators are used to protect CPU from a short circuit in the output por
C. Optoisolators are used to protect the input/output devices
D. Optoisolators are used to isolate the CPU from input/output ports: C.
Op- toisolators are used to protect the input/output devices
13.Allen-Bradley industrial controllers are grouped as .
A. Programmable Logic Controllers
B. Programmable Automation Controllers
C. Safety Programmable Controllers
D. All of the above.: D. All of the above.
14.. Which of the following method(s) may be used to program PLCs?
A. Ladder Logic Diagram (LLD) programming
B. Function block programming
C. Text programming
D. All of the above.: D. All of the above.
15.Which of the following statements is false?
A. All Allen-Bradley PLCs have power supply and central processing units
B. All Allen-Bradley PLCs have Analog-To-Digital (ADC) and Digital-To-
Analog (DAC) Ports
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Verified Answers
1.Programmable logic controllers are used to control .
A. robots
B. electric motors
C. conveyors
D. All of the above: D. All of the above
2.PLCs were first introduced in the .
A. automotive industry
B. power industry
C. process industry
D. None of the above: A. automotive industry
3.PLCs are designed to replace .
A. microprocessors
B. microcontrollers
C. electromechanical relay panels
D. desktop computers: C. electromechanical relay panels
4.Which of the following component(s) can be found in a PLC?
A. central processing units
B. input/output ports
C. power supply
D. All of the above.: D. All of the above.
5.The first PLC was built by .
A. General Motor
B. Allen-Bradley
C. Siemens
D. IBM: A. General Motor
6.Which of the following is part of the central processing unit (CPU)?
A. RAM and ROM memory units
B. Microprocessor
C. Support chips
D. All of the above.: D. All of the above.
7.A microprocessor has a(n) .
A. arithmetic logic unit (ALU)
B. decode unit
C. data and instruction cache
D. All of the above.: D. All of the above.
8.Changing relay logic requires .
A. rewiring the relays
B. changing input port names
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6
, PLC Chapter 1 Questions With All Correct &
Verified Answers
C. changing output port addresses
D. None of the above: A. rewiring the relays
9.An advantage of changing a relay logic circuit over a PLC logic control is
.
A. it is less expensive
B. it is less time consuming to program
C. it has less current capability
D. None of the above.: D. None of the above.
10.Static RAM .
A. requires more space than dynamic RAM on the PLC motherboard
B. is more expensive than dynamic RAM
C. requires more transistors and has faster response than dynamic RAM
D. All of the above: D. All of the above
11.Which of the following statements is false?
A. EPROM can be programmed several times.
B. EEPROM can be programmed several times.
C. Flash ROM can be programmed several times.
D. Masked ROM can be programmed several times.: D. Masked ROM can
be programmed several times.
12.Which of the following statements is false?
A. Optoisolators are used to protect CPU from high voltage in the input port
B. Optoisolators are used to protect CPU from a short circuit in the output por
C. Optoisolators are used to protect the input/output devices
D. Optoisolators are used to isolate the CPU from input/output ports: C.
Op- toisolators are used to protect the input/output devices
13.Allen-Bradley industrial controllers are grouped as .
A. Programmable Logic Controllers
B. Programmable Automation Controllers
C. Safety Programmable Controllers
D. All of the above.: D. All of the above.
14.. Which of the following method(s) may be used to program PLCs?
A. Ladder Logic Diagram (LLD) programming
B. Function block programming
C. Text programming
D. All of the above.: D. All of the above.
15.Which of the following statements is false?
A. All Allen-Bradley PLCs have power supply and central processing units
B. All Allen-Bradley PLCs have Analog-To-Digital (ADC) and Digital-To-
Analog (DAC) Ports
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