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Automation Technician > Module 2 : Industrial Control Devices > Flashcards

Module 2 : Industrial Control Devices Flashcards

1
Q

SCR (Silicon Controlled Rectifier)

A

Three-terminal PNPN device that acts as a gated diode. The gate terminal switches the device in allowing current to flow from anode to cathode.

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2
Q

Commutation

A

Interrupting current, such as through the various windings of a DC motor armature.

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3
Q

Ladder Logic

A

An industry standard which uses successive horizontal lines with symbols to represent the logic operation of a control system.

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4
Q

Relay Logic

A

A method of controlling industrial electric circuits by using relays and contacts.

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5
Q

Actuator

A

Lever, arm, or wand.

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6
Q

Positioner

A

A servomechanism that moves to persis location

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7
Q

Hydraulic actuators

A
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8
Q

Two types of interfaces used in robotic circuits

A

electrical and hydraulic

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9
Q

Single Pole switch

A

single pole switch only allows the current one circuit to pass through

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10
Q

(NO)

A

Normally Open

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11
Q

(NC)

A

Normally closed

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12
Q

Pole

A

Movable contact on the switch. A completely isolated circuit that is allowed to pass through the switch

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13
Q

Thow

A

The number of positions in which the switch can be set.

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14
Q

What term describes the number of completely isolated circuits that pass through a switch at a given time?

A

POLE

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15
Q

What term describes the total number of individual circuits that each pole is capable of controlling?

A

Throw

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16
Q

How are switched rated?

A

Switches are generally rated by their current-handling capability and the type of load they can control.

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17
Q

Which proximity switches are suitable for high-speed counting applications?

A

RF inductive proximity switches

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18
Q

Capacitive proximity switches can detect only ferromagnetic materials. (True/False)

A

False

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19
Q

What is one disadvantage of optical proximity sensor?

A

The object sensed must have a reflective surface.

20
Q

VA

A

Volt Ampage

21
Q

Calculation for the hold in Current

A

hold-in current= VA hold-in rating
______________
Coil voltage rating

22
Q

Calculation for inrush current

A

inrush current = VA inrush coiling
________________
Coil voltage rating

23
Q

How much current must flow to keep a relay latched?

A

Holding current

24
Q

What configuration ensures that when one device. is energized the other remains de-energized?

A

Electrical interlock

25
Q

A relay’s make rating is often five times it’s normal operating current? (True/False)

26
Q

Seal-in circuit

A

A method of maintaining a current flow after a momentary switch has been pressed and released.

27
Q

holding Contact

A

seal-in contact

28
Q

A seal-in circuit is usually parallel with a switch? (True/False)

29
Q

What maintains current flow to the control relay?

A

Holding Contact

30
Q

Electromagnetic Contactor

A

High power relay Current-handling above 15 A heavy duty contacts for switching industrial loads. designed with a stationary core and moveable armature

31
Q

How are electromagnetic contactors rated?

A

According to the size and type of load by National Electrical Manufacturers Association (NEMA)

32
Q

Electromagnetic contactors can be rated in horsepower.

true/False

33
Q

Overload relays and Circuit breakers can withstand repeated tripping and capable of reset.

A

Used in Excessive current flow in a industrial electronic circuit

34
Q

How are overload relays classified ?

A

as either thermal or magnetic

35
Q

Thermal overload relays

A

Respond to high temperature by overload current

36
Q

Magnetic Overload relays

A

React ONLY to excessive current and Not by temperature

37
Q

Most popular types of thermal relays are?

A

Metal alloy and Bimetal type

38
Q

Solenoid

A

an electro-mechanical device used in industrial control circuits. Commonin robots with hydraulic controls.

39
Q

How do solenoids differ from relays?

A

instead of controlling electrical power, solenoid valves generally control fluid power and have no contacts.

40
Q

Hydraulic fluid is used to rotate rotary actuators, besides filling hydraulic cylinders (True/ False)

41
Q

What are the ports called on a three-way solenoid valve?

A

Inlet, Outlet, exhaust.

42
Q

What devices are often used to operate control valves?

43
Q

Valve positions are used with feedback circuits (True /False)

44
Q

What does TDR do?

A

Provide a delayed switching action

45
Q

What are 3 basic types of TDR?

A

Electromechanical, electropneumatic and electronic

46
Q

What are 2 basic types of counters?

A

Mechanical or Electronic

47
Q

2,9,13,16,20, 28,30

Automation Technician (2 decks)

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