Question 1

Batteries are used in a PLC's processor to:

Accepted Answer

A)  maintain data in volatile memory when line power is removed from the processor.
B)  operate the status lights LEDs.
C)  maintain data in nonvolatile memory when line power is removed from the processor.
D)  maintain outputs through a power failure.E) B) and D)
F) C) and D)

Question 2

The purpose of the triac switch is to:

Accepted Answer

A)  turn the load ON and OFF.
B)  vary the current flow to the load in accordance with the input signal level.
C)  vary the voltage across the load in accordance with the input signal level.
D)  both b and c.E) A) and C)
F) None of the above

Question 3

The most commonly used programming device is a:

Accepted Answer

A)  personal computer.
B)  dedicated industrial programming terminal.
C)  hand-held programmer.
D)  proprietary programming device.E) All of the above
F) B) and C)

Question 4

Which of the following specifications defines the number of field inputs or outputs that can be connected to a single module?

Accepted Answer

A)  Electrical isolation.
B)  Points per module.
C)  Threshold voltage.
D)  Current per input.E) A) and C)
F) B) and D)

Question 5

Most PLC electronic components are not sensitive to electrostatic discharge.

Accepted Answer

A) True 
 B)False

Question 6

An analog input or output is a signal that varies continuously within a certain range.

Accepted Answer

A) True 
 B)False

Question 7

The "ON state input voltage range" specification refers to:

Accepted Answer

A)  the type of voltage device that will be accepted by the input.
B)  range of leakage voltage present at the input in its ON state.
C)  minimum and maximum output operating voltages.
D)  voltage at which the input signal is recognized as being ON.E) C) and D)
F) B) and C)

Question 8

Discrete means that each input or output has two states: true (on)or false (off).

Accepted Answer

A) True 
 B)False

Question 9

A ______ module is used to establish connections for the exchange of data.

Accepted Answer

A)  thumbwheel
B)  communication
C)  servo
D)  PIDE) B) and D)
F) B) and C)

Question 10

A discrete output interface module is designed to provide:

Accepted Answer

A)  output voltages only in the 5 VDC range.
B)  varying AC or DC voltages depending on the type of module selected.
C)  ON/OFF switching of the output field device.
D)  binary-coded outputs.E) B) and C)
F) All of the above

Question 11

The Allen-Bradley SLC-500 address I:2/4 refers to an:

Accepted Answer

A)  Input module in slot 4,terminal 2.
B)  Output module in slot 4,terminal 2.
C)  Input module in slot 2,terminal 4.
D)  Output module in slot 2,terminal 4.E) A) and D)
F) None of the above

Question 12

The schematic diagram shown is that of a(n) :

Accepted Answer

A)  discrete output module.
B)  analog output module.
C)  discrete input module.
D)  analog input module.E) All of the above
F) A) and D)

Question 13

A volatile memory will lose its programmed contents if operating power is lost.

Accepted Answer

A) True 
 B)False

Question 14

For the PLC analog I/O control system shown,the fluid flow is controlled by:

Accepted Answer

A)  varying the amount of the valve opening.
B)  switching the valve ON and OFF.
C)  switching the level sensor ON and OFF.
D)  varying the position of the level sensor.E) A) and D)
F) A) and C)

Question 15

Information stored in a RAM memory location can be written into or read from.

Accepted Answer

A) True 
 B)False

Question 16

For the block diagram of the output module shown,the input comes from the:

Accepted Answer

A)  input field device.
B)  processor.
C)  output field device.
D)  line power supply.E) A) and B)
F) C) and D)

Question 17

Electronic components found in PLC modules:

Accepted Answer

A)  are not effected by electrostatic voltages.
B)  can be damaged by electrostatic voltages.
C)  can have their performance degraded by electrostatic voltages.
D)  both b and c.E) B) and D)
F) All of the above

Question 18

When the triac is in the OFF state:

Accepted Answer

A)  zero current always flows through the load.
B)  a small leakage current may flow through the load.
C)  the rated surge current flows through the lamp.
D)  the rated nominal current flows through the lamp.E) A) and C)
F) A) and B)

Question 19

The main element of an analog output module is:

Accepted Answer

A)  AC to DC rectifier.
B)  DC to AC inverter.
C)  analog to digital converter.
D)  digital to analog converter.E) A) and B)
F) A) and C)

Question 20

The thermocouple shown is a:

Accepted Answer

A)  ungrounded type with the shield grounded at the module end.
B)  ungrounded type with the shield grounded at the thermocouple end.
C)  grounded type with the shield grounded at the module end.
D)  grounded type with the shield grounded at the thermocouple end.E) All of the above
F) C) and D)

Exam 2: Plc Hardware Components

Information stored in a RAM memory location can be written into or read from.

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The main element of an analog output module is:

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Electronic components found in PLC modules:

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For the PLC analog I/O control system shown,the fluid flow is controlled by:

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A volatile memory will lose its programmed contents if operating power is lost.

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The "ON state input voltage range" specification refers to:

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For the block diagram of the output module shown,the input comes from the:

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Most PLC electronic components are not sensitive to electrostatic discharge.

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The Allen-Bradley SLC-500 address I:2/4 refers to an:

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The most commonly used programming device is a:

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The purpose of the triac switch is to:

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The thermocouple shown is a:

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A discrete output interface module is designed to provide:

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When the triac is in the OFF state:

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Which of the following specifications defines the number of field inputs or outputs that can be connected to a single module?

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Batteries are used in a PLC's processor to:

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The schematic diagram shown is that of a(n) :

Correct AnswerverifiedShow Answer

A ______ module is used to establish connections for the exchange of data.

Correct AnswerverifiedShow Answer

Discrete means that each input or output has two states: true (on)or false (off).

Correct AnswerverifiedShow Answer

An analog input or output is a signal that varies continuously within a certain range.

Correct AnswerverifiedShow Answer

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