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Industrial Control > Midterm Controls > Flashcards

Midterm Controls Flashcards

1
Q

To reverse the rotation of a single phase motor, you must:

A

Interchange start winding (or run winding, but not both)

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2
Q

When a motor is being inched its connected to:

A

A reduced voltage

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3
Q

When a motor is being jogged, it’s connected to:

A

Full line voltage

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4
Q

A type of device used to detect flow within a pipe

A

Flow switch

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5
Q

A type of device used to monitor flow rate within a pipe

A

Flow sensor

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6
Q

A motor starter that provides overcurrent protection, overload protection, and a disconnecting means is called a:

A

Combination starter

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7
Q

2 basic types of overload relays are:

A

Thermal and magnetic

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8
Q

A float switch that is used to control a motor directly must be rated to carry:

A

FLA

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9
Q

When Installing/replacing plug-in relays, the electrician should pay close attention to:

A

The relays coil voltage

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10
Q

A method of preventing the coils of a reversing starter from energizing simultaneously is known as:

A

Interlocking

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11
Q

What are the two main parts of a solenoid:

A

Coil and plunger

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12
Q

Multiple stop buttons used to control a magnetic motor starter are placed in:

A

Series

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13
Q

Multiple start buttons used to control a magnetic motor starter are placed in:

A

Parallel

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14
Q

Two wire control provides:

A

Low voltage release

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15
Q

Three wire control provides:

A

Low voltage protection

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16
Q

The contacts of a motor starter that carry the FLA of the motor are called:

A

Pole or Line or Load contacts

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17
Q

A Thermopile exists when:

A

Two or more thermocouples are connected in series

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18
Q

Copper is used to provide good Thermal contact in what device?

A

RTD Probe

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19
Q

A device that works on the change of resistance with a change in heat:

A

RTD - resistance temperature detector

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20
Q

Thermistors exhibit:

A

Rapid change of resistance with a change in temp

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21
Q

Which relay is a length of resistive wire connected in series with the motor to sense motor current?

A

Hot wire relay

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22
Q

A device that employs the heating of two dissimilar metals is called a:

A

Thermocouple

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23
Q

With a spiral bi-metal strip, if a calibrated scale is placed behind the pointer attached to the centre of the spiral, it becomes a:

A

Thermometer

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24
Q

Two dissimilar metals bonded together have:

A

Different expansion rates

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25
Q

What type of wire is an RTD is made of:

A

Platinum wire

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26
Q

The most common heat sensing device used in room Thermostats is:

A

Bi-metal strip

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27
Q

A long bi-metal strip is desirable because it:

A

Exhibits a greater movement with change in heat

28
Q

Which proximity dectectors do not depend on metal to operate?

A

Capacitive Prox. Detectors

29
Q

T or F, proximity detectors are basically just metal detectors

A

True

30
Q

T or F, Sensors should be mounted as close to other metals as possible?

A

False

31
Q

Most ultrasonic detectors have a wide range of adjustable:

A

Sensing distance

32
Q

Ultrasonic detectors admit a:

A

High frequency sound

33
Q

Most capacitive proximity detectors have a range of approximately:

A

25mm

34
Q

A proximity detector that can detect non-metallic objects usually operates on a change in:

A

Capacitance

35
Q

With proximity detectors, sensors should be mounted:

A

As far away from each other as possible

36
Q

With an all-metal detector, a ferrous metal can be sensed at:

A

3 times the distance of a non-ferrous metal

37
Q

All metal detectors operate at:

A

Radio Frequencies

38
Q

Proximity detectors are basically:

A

Metal detectors

39
Q

Photodetectors that have both the transmitter and the receiver units mounted in the same housing, depend on a ______ for operation.

A

Reflector

40
Q

Photodetective devices emit _____ when in the presence of light.

A

Electrons

41
Q

T or F, when the CAD cell is in the presence of light, it’s resistance is high.

A

False

42
Q

T or F, Photodetectors can be used to sense the presence or absence of almost any object.

A

True

43
Q

What are the 3 categories of photo-operated devices:

A
  1. Photo-voltaic
  2. Photo-emissive
  3. Photo-conductive
44
Q

The life span of a photodectectors operation is:

A

Millions of times without damage or wear

45
Q

To allow or stop current to flow, a photoconductive device changes its…

A

Resistance with light

46
Q

Photodectectors detect:

A

Light

47
Q

The greatest advantage of a photo-emissive device over other photo dectectors is its:

A

High speed switching

48
Q

A photo-emissive device emits:

A

Electrons when in the presence of light

49
Q

If neither side of a control transformer is grounded, this is generally referred to as a _____ system

A

Floating

50
Q

The 120v secondary control transformer is usually bonded to ground with terminal ______.

A

X2

51
Q

What terminal type do control transformers have connected to the primary and secondary leads.

A

Screw terminals

52
Q

Magnetic control systems often operate on what voltage?

A

120V

53
Q

Most industrial motors operate on voltages that range from:

A

208V - 600V

54
Q

When do Omron eleven pin timers change state?

A

When the preset time has elapsed

55
Q

Off-delay pneumatic timer contacts change state on:

A

Energization of the coil

56
Q

Typically, 8-pin electronic timers are:

A

On-delay

57
Q

Timers that operate by restricting the flow of air through an orifice to rubber bellows or diaphragm are:

A

Pneumatic

58
Q

Programmable controllers contain _________ electronic timers.

A

Internal

59
Q

Periodically, how do pulse timers operate

A

Continually turn on and off at regular intervals

60
Q

What determines the full range of time for a clock timer

A

Gear ratio

61
Q

T or F, pneumatic timers are limited to either normally open or normally closed contacts

A

False

62
Q

A N.O.T.C contact must be connected to an _______ relay when it is to be time delayed when closing.

A

On-delay

63
Q

In solenoid valves, digital means that the valve has only ______ states of operation

A

Two

64
Q

T or F, Two-way solenoid valves may be normally open or normally closed

A

True

65
Q

4 way solenoid valves are generally used to control air supply to:

A

Double acting cylinders

66
Q

Two way solenoids usually are used to control the flow of:

A

Liquids or Gases

67
Q

If the outlet side of a two-way solenoid valve is connected to the pressure lines, this could cause the valve to:

A

Leak, not function properly, or not seal properly

Industrial Control (1 decks)

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