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Motor Controls Final Exam > Motors > Flashcards

Motors Flashcards

1
Q

A line diagram shows the control devices in their___________ without regard to their_____________.

A
  1. Logical sequence
  2. Physical location
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2
Q

Wiring & line diagrams displays all contacts in their _________ without any __________ applied.

A
  1. De-energized state
  2. External forces
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3
Q

Three sectors of a control circuit.

A
  1. Stop
  2. Start
  3. Run
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4
Q

Manual motor starters must provide ______ protection unless exempted by code

A

O/L

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5
Q

True or False: Manuel control circuits typically provide no or low voltage protection.

A

True

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6
Q

Devices and control circuits some times fail. Electricians must ___________ sources of power to prevent injuries

A

Lock out

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7
Q

True or false: 2 wire control typically provides high voltage protection.

A

False: no or low voltage

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8
Q

When a magnetic motor starter protector is used with pilot devices, a greater degree of ________ may be achieved.

A

Control

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9
Q

Push-buttons contacts may be ______ & _______.

A

N.O & N.C

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10
Q

Pole contacts of a motor starter are intended to carry the ______ of the motor.

A

FLA

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11
Q

The N.O auxiliary contact is called 5 contacts, Name them.

A
  1. Holding
  2. Maintaining
  3. Run
  4. Sealing
  5. Memory
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12
Q

Button interlocking that change state simultaneously. What is this act called?

A

Double acting

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13
Q

Mechanical interlocking for F/R contactors, physically prevents both _________ from moving to the ________ simultaneously.

A
  1. Contactor armatures
  2. Closed position
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14
Q

When a motor starter protector employs a disconnecting means as well as a short circuit protection, it is given the name ____________.

A

Combination starter

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15
Q

A change in direction of a 3 phase motor may be accomplished by interchanging the connections of__________ leads.

A

Any 2

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16
Q

A single phase condition will cause a motor to _____ and _______ when in operation.

A
  1. Hum
  2. Labour
17
Q

Additional start buttons must be connected in what?

A

Parallel

18
Q

A relay is a small _____________ device

A

Electromagnetic

19
Q

What type of pressure switch is generally used to sense small changes in low pressure systems?

A

Diaphragm switch

20
Q

What type of float switches have a differential setting?

A

Rod- operated
Chain operated

21
Q

What are 2 basic classifications of timers?

A
  1. On delay
  2. Off delay
22
Q

What are 3 advantages of a piezoresistive sensor?

A
  1. Small
  2. Reliability
  3. Accurate
23
Q

What are flow switches used for?

A

To detect movement of air/ liquid and is constructed from a snap action micro switch

24
Q

Flow switches generally contain a _________ & _________ micro switch. They are also used to control ______________.

A
  1. Single pole
  2. Double throw
  3. Low current loads
25
Q

In a flow sensor, what detects the amount of liquid and air in pipes/ ducts?

A

Transducer

26
Q

Electromagnetic flow sensors operate on what?

A
  1. Principle of Faradays Law

Faraday law: when a conductor moves through a magnetic field a voltage is induced into the conductor

27
Q

Orifice plate flow sensors operate by inserting a ________ with an orifice of known size into the flow path

A

Plate

28
Q

When a moving liquid strikes an object, a swirling current, called a vortex is created. This is known as?

A

Vortex flow sensors

29
Q

A _________ Operates on the principle that air or gas flowing across a surface causes heat transfer. They’re are also commonly known to sense smaller amounts of air/gas.

A

Airflow switch

30
Q

A __________ can measure flow rate by thermal energy dissipation. Typically have 2 positive coefficients & sense flow of air, water, & oil.

A

Calorimetric flow sensor

31
Q

A __________ is used to detect when an object is present or absent. Activated by motion of machine/ object. Contain a type of bumper arm.

A

Limit switches

32
Q

Limit switches are used as _________ to control ______, ________ .

A
  1. Pilot devices
  2. Relays
  3. Motor starters
33
Q

What are the 2 micro switches?

A
  1. Subminiature micro switch
  2. Micro limit switch
34
Q

Restricts air flow through an orifice to rubber bellows or diaphragm. This is know as?

A

Pneumatic timer

35
Q

Low and no voltage protection aides in protecting an operator from motor driven machinery starting __________ upon restoration of full systems voltage

A

Unexpectedly

36
Q

Low and no voltage protection cannot _______ the safety of an operator

A

Ensure

37
Q

Magnetic starters tend to have what type of wiring control?

A

3 wire control

Motor Controls Final Exam (1 decks)

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