Deck 1: Introduction to Industrial Control Systems, Discrete Control Input and Output Devices

Question 1

The switch from water power to steam power caused the industrial revolution.

Answer 1

True

Question 2

Changes in manufacturing are driven primary by a need for increased product quality.

Answer 2

False

Question 3

At the start of the 20th century the electrification of manufacturing and the invention of the electric motor moved manufacturing to the next level.

Answer 3

True

Question 4

The process of a machine measuring the product output and automatically correcting for improper operation is call feedback control.

Question 5

Project type manufacturing with the many complex parts needs the greatest level of automation control.

Question 6

FMS stands for flexible material system and is often made up of FMCs that are linked together.

Question 7

Fixed automation machines are designed for a small number of products and FMCs are designed to be flexible and produce a variety of products.

Question 8

Software that has been thoroughly tested and used for some period of time is usually not the cause of system problems.

Question 9

There are two conditions when software is the source of a system problem. One of the condition is when an operator enters incorrect set points or parameters into the program.

Question 10

The difference between power and signal flow on a system block diagram is that signal flows from left to right and power flows from right to left.

Question 11

Flow of signal from a block on the left to a block on the right through four other blocks is what type of signal flow?

A) Switched path
B) Divergent
C) Linear
D) Convergent
E) Feedback

Question 12

Flow of signal from one block to two or more other blocks is what type of signal flow?

A) Linear
B) Divergent
C) Convergent
D) Switched path
E) Feedback

Question 13

Flow of signal from two or more blocks into a single block is what type of signal flow?

A) Convergent
B) Switched path
C) Linear
D) Feedback
E) Divergent

Question 14

Flow of signal from the output back to the input is what type of signal flow?

A) Convergent
B) Linear
C) Switched path
D) Divergent
E) Feedback

Question 15

The term "divide and conquer" means

A) Divide the troubleshooting tasks equally between troubleshooters.
B) Make the first measurement at the first point where a signal divides.
C) Make the first troubleshooting measurement halfway between the input and output on the signal flow path.
D) All of the above

Question 16

In a divergent circuit the signal at the output of one of the divergent circuit is correct. What can you conclude?

A) The problem is between the divergent input and the input of the system.
B) All divergent outputs are correct.
C) The problem is in the divergent circuit.
D) All other divergent paths must be measured before a decision.
E) No conclusions without more data

Question 17

In a linear circuit the signal at the output is bad. The testing approach that would reduce the number of measurements is to

A) Measure the input and then check the output of each block starting from the input.
B) Make the first measurement at the output of the block half way between the input and output.
C) Measure the signal at each block output starting at the output.
D) None of the above.

Question 18

In a convergent circuit with three switched inputs, the signal at the output is bad when the switch is on the first convergent input. When the switch is changed to second of the convergent inputs the output is correct. What can you conclude?

A) The switch could be bad.
B) There is a problem between the first convergent input and input to the system.
C) There is a problem between the convergent switch and the output of the system.
D) Both A and C.
E) Both A and B

Question 19

If two symptom are present that are unrelated that means that

A) A single component may have failed in two different circuits or modules.
B) Two component may have failed in the same circuit or module.
C) The problem is in a convergent circuit.
D) The problem is in a divergent circuit.
E) None of the above

Question 20

When using funneling as a part of the troubleshooting process you would

A) start with bracket narrow and move them to a wider separation.
B) start with tests that focus on replacing sub -system components and modules
C) start with tests that focus on front panel control settings.
D) start with tests that focus on measuring signals to verify the symtoms.
E) None of the above.

Question 21

Match the five manufacturing categories with the description of each type

-Project

A) Many complex parts are used to build a one-of-a-kind product.
B) A flow of products from a manufacturing system that is never interrupted.
C) A system where the delivery time required by the customer is often shorter than the total time it takes to build the product: the product has many options or models; and an inventory of subassemblies is normally present.
D) A system with 100 percent repeat business, multi-year contracts, high but variable production quantities.
E) Non-complex products with few parts and small production volum

Question 22

Match the five manufacturing categories with the description of each type

-Job shop

A) Many complex parts are used to build a one-of-a-kind product.
B) A flow of products from a manufacturing system that is never interrupted.
C) A system where the delivery time required by the customer is often shorter than the total time it takes to build the product: the product has many options or models; and an inventory of subassemblies is normally present.
D) A system with 100 percent repeat business, multi-year contracts, high but variable production quantities.
E) Non-complex products with few parts and small production volum

Question 23

Match the five manufacturing categories with the description of each type

-Repetitive

A) Many complex parts are used to build a one-of-a-kind product.
B) A flow of products from a manufacturing system that is never interrupted.
C) A system where the delivery time required by the customer is often shorter than the total time it takes to build the product: the product has many options or models; and an inventory of subassemblies is normally present.
D) A system with 100 percent repeat business, multi-year contracts, high but variable production quantities.
E) Non-complex products with few parts and small production volum

Question 24

Match the five manufacturing categories with the description of each type

-Line

A) Many complex parts are used to build a one-of-a-kind product.
B) A flow of products from a manufacturing system that is never interrupted.
C) A system where the delivery time required by the customer is often shorter than the total time it takes to build the product: the product has many options or models; and an inventory of subassemblies is normally present.
D) A system with 100 percent repeat business, multi-year contracts, high but variable production quantities.
E) Non-complex products with few parts and small production volum

Question 25

Match the five manufacturing categories with the description of each type

-Continuous

A) Many complex parts are used to build a one-of-a-kind product.
B) A flow of products from a manufacturing system that is never interrupted.
C) A system where the delivery time required by the customer is often shorter than the total time it takes to build the product: the product has many options or models; and an inventory of subassemblies is normally present.
D) A system with 100 percent repeat business, multi-year contracts, high but variable production quantities.
E) Non-complex products with few parts and small production volum

Question 26

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Space shuttle

A) Repetitive
B) Job shop
C) Line
D) Project
E) Continuous

Question 27

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Automotive wiring harness

A) Repetitive
B) Job shop
C) Line
D) Project
E) Continuous

Question 28

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Metal supports to repair a production machine

A) Repetitive
B) Job shop
C) Line
D) Project
E) Continuous

Question 29

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Computer printers

A) Repetitive
B) Job shop
C) Line
D) Project
E) Continuous

Question 30

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Soft drinks

A) Repetitive
B) Job shop
C) Line
D) Project
E) Continuous

Question 31

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Men's disposalable razors

A) Line
B) Repetitive
C) Continuous

Question 32

Match the products with the catagories of manufacture systems that would be used t o produce them.

-VCR players

A) Line
B) Repetitive
C) Continuous

Question 33

Match the products with the catagories of manufacture systems that would be used t o produce them.

-Electronic boards for control of microwave ovens

A) Line
B) Repetitive
C) Continuous

Question 34

Use the following signal flow diagram when matching the following information
?

-With power applied to the system, no sound is heard from either speaker when both microphones are used.

A) Move the left bracket to the input of the pre-amplifier - the fault is in the pre-amplifier.
B) Right bracket moves to output of pre-amplifier
C) Current braket location
D) Left bracket moves to input side of the power amplifie

Question 35

Use the following signal flow diagram when matching the following information
?

-When switch is changed (position

A) Move the left bracket to the input of the pre-amplifier - the fault is in the pre-amplifier.
B) Right bracket moves to output of pre-amplifier
C) Current braket location
D) Left bracket moves to input side of the power amplifie

Question 36

Use the following signal flow diagram when matching the following information
?

-With right bracket at the output of the pre -amplifier, no output at the
Pre -amplifier is detected by a meter, but there is a signal present at the input to the pre -amplifier.

A) Move the left bracket to the input of the pre-amplifier - the fault is in the pre-amplifier.
B) Right bracket moves to output of pre-amplifier
C) Current braket location
D) Left bracket moves to input side of the power amplifie

Question 37

Use the following signal flow diagram when matching the following information
?

-When switch is changed (position

A) Move the left bracket to the input of the pre-amplifier - the fault is in the pre-amplifier.
B) Right bracket moves to output of pre-amplifier
C) Current braket location
D) Left bracket moves to input side of the power amplifie

Question 38

Use the following signal flow diagram when matching the following information
?

-When power is applied to the system with the selector switch in position B, a CD in the player, the play mode selected and the volumn increased, no sound comes from either speaker.

A) Put the left bracket o n the left side of the CD player box.
B) Move the right bracket to the right side of the CD player box. The fault is in the CD player.
C) The assumption of only single faults means two separate devices cannot fail a t the same time

Question 39

Use the following signal flow diagram when matching the following information
?

-With the left bracket on the left side of the CD player box, the selector switch is placed into position A. When either microphone is used, both speaker perform normally.

A) Put the left bracket o n the left side of the CD player box.
B) Move the right bracket to the right side of the CD player box. The fault is in the CD player.
C) The assumption of only single faults means two separate devices cannot fail a t the same time

Question 40

Use the following signal flow diagram when matching the following information
?

-Without additional testing the right bracket can be moved to the input side of each speaker.

A) Put the left bracket o n the left side of the CD player box.
B) Move the right bracket to the right side of the CD player box. The fault is in the CD player.
C) The assumption of only single faults means two separate devices cannot fail a t the same time

Question 41

A discrete device is one that has only two states, on and off.

Question 42

The mechanical device used to change the state of a switch is called the pole.

Question 43

Switches designated for electronic circuit applications are not designed to switch medium to high power.

Question 44

Electronic duty switch contacts are designed to switch high currents and pilot duty contacts are more suited for switching very small current levels.

Question 45

When a toggle switch is in the off position, the NO contacts are an open circuit and the NC contacts are shorted.

Question 46

A DPDT switch contact configuration would have two poles, two NC contacts, and two NO contacts.

Question 47

The term "throw"in a switch designation indicates if the switch has only a NO or if the switch has both NO and NC contacts.

Question 48

Mercury switches are useful in applications where the switching force available is very small.

Question 49

Limit switches have double break contacts in most cases.

Question 50

The operator must be held in the on position for maintain contact type switches to have their NO contacts shorted.

Question 51

Industrial selector switches are similar to electronic rotary switches.

Question 52

Selector switches are used to switch medium to high currents in industrial applications.

Question 53

Limit switches come with either a side lever operator or with a side plunger.

Question 54

The held open limit switch symbol is used for normally open contacts that are held open by the process.

Question 55

The angle on a limit switch trip dog is a function of the velocity of the object that makes contact with the limit switch lever or plunger.

Question 56

Relays usually have the same pull in and drop out current.

Question 57

Commercial and industrial relays generally have the same contact configurations as switches.

Question 58

Relays with reed and mercury wetted contacts have the lowest contact resistance.

Question 59

On delay type time delay relays close NO contacts when power is applied and keep the contacts closed for a specified time delay.

Question 60

The instantaneous contacts on a time delay relay operate like NO and NC contacts would on a control relay.

Question 61

Contactors are relays used to switch high current and high power devices like motors.

Question 62

Contactors have thermal overloads built into the switching device.

Question 63

Three wire control just identifies the number of wires between the contactor and the control push buttons.

Question 64

Contactor auxiliary contacts are used in the control circuit to protect the load from overload currents.

Question 65

Contactor overload contacts are used in the motor power circuit to protect the motor from overload currents.

Question 66

Switch problems can be grouped into two categories, problems with the operator and problems with the contacts.

Question 67

Relay problems fall into the same two groups as switch problems, namely operators and contacts.

Question 68

If two loads with different voltage levels had to be switched with a single break type device, you would have to choose a switch that had a minimum of two poles.

Question 69

If it is necessary to switch a load current of 50 mA, then the contacts must have a good dry circuit rating and the switch must be rated for electronic duty.

Question 70

If the position of an object oscillates about the switching point, then you need a position sensing switch with snap action and mercury wetted contacts.

Question 71

The inrush current is higher than the sealed current for a relay because the air gaps are larger and the armature is made of laminated metal.

Question 72

If a motor must start 15 seconds after the start switch is pressed, and a motor run light must come on when the start switch is pressed, then an on -delay type time delay relay must be used with one set of instantenous contacts.

Question 73

The three -wire control circuit for a motor has a momentary stop (NC) and start (NO) push button, motor contactor, and overload contacts wired in series, and an auxiliary contact connected across the stop push button contacts.

Question 74

An industrial selector switch would most often have:

A) a good dry circuit rating.
B) double break contacts.
C) a push button operator.
D) more than three positions for the operator.

Question 75

The type of switch used to separate the motor and its control circuit from main power is a:

A) limit switch.
B) control relay.
C) drum controller.
D) disconnect.
E) selector.

Question 76

Which of the following parts are NOT a component in a lever type limit switch?

A) Lever
B) Operating head
C) Switch body
D) Contact rotator
E) Receptacle

Question 77

Which of the following components are NOT found in a typical motor starter.

A) Auxiliary contact
B) Overload contacts
C) Motor contacts
D) Coil
E) Start switch

Question 78

Which of the following components are NOT a part used in a relay?

A) Armature
B) Stationary contacts
C) Magnet
D) Spool valve
E) Coil

Question 79

Which of the following is true for a 30 second on delay type time delay relay 10 seconds after power applied to the coil?

A) The instantaneous contacts are open.
B) The NC contacts are open.
C) The NO contacts are open.
D) The relay coil is not energized.
E) All of the above

Question 80

Which of the following is true for a 30 second on delay type time delay relay 40 seconds after power applied to the coil?

A) The instantaneous contacts are open.
B) The NO contacts are closed.
C) The NC contacts are closed.
D) The coil is not energized.
E) None of the above.