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Industrial Maintenance > Midterm > Flashcards

Midterm Flashcards

0
Q

What is voltage?

A

The amount of electrical pressure that causes electrons to move in a circuit.

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1
Q

What is a alternating current?

A

A current that reverses its direction of flow at regular intervals.

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2
Q

What is a contact?

A

The conducting part of a switch that operates with another conducting part to complete(close) or break(open) a circuit.

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3
Q

What is an open circuit?

A

A circuit having an incomplete path, which prevents current flow.

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4
Q

What is a closed circuit?

A

The presence of a completed path for current flow.

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5
Q

What is a short circuit?

A

A undesirable, low resistance path for current to leave the normal current carrying path through a load.

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6
Q

What is arcing?

A

The discharge of an electric current across a gap.

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7
Q

What is a series circuit?

A

A circuit that has two or more components connected such that there is only one path for current flow.

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8
Q

What is a conductor?

A

A material that has little resistance and permits electrons to move through it easily.

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9
Q

What is an inverter?

A

A device that changes dc voltage into ac voltage of any frequency.

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10
Q

What is a rectifier?

A

A electrical component that converts ac to dc by allowing voltage and current to move in only one direction.

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11
Q

What is the frequency of electricity in the US?

A

60hz

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12
Q

What is transient voltage?

A

Temporary undesirable voltage spike, ranging from a few volts to several thousand volts and lasting a few micro sends up to several milliseconds.

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13
Q

What is a solid state device?

A

A electronic component that switches or controls the flow of current in a circuit with no parts.

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14
Q

What is a insulator?

A

A material that has high resistance

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15
Q

What is a Overcurrent Protection Device(OCPD)?

A

A device that automatically opens a circuit to prevent damage from a high-current condition?

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16
Q

What is Direct Current(DC)?

A

Current that flows in one direction only.

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17
Q

What is an atom?

A

The smallest building block of matter that cannot be divided into a smaller unit without changing its basic character. Consist of protons, neutrons, and electrons.

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18
Q

What is a current? What is it measured in?

A

The flow of electrons through a conductor. Measured in amperes.

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19
Q

What is resistance? What is it measured in?

A

The opposition to the flow of electrons. It is measured in Ohms.

20
Q

What is a parallel circuit?

A

A circuit that has two or more components connected such that there are multiple paths for current flow.

21
Q

What is a ground circuit/line?

A

Conducting connection between electrical equipment and the earth.

22
Q

What is a relay?What does it do?

A

A electrical switch that is actuated by a separate circuit. It allows a low voltage control circuit to open or close contacts in a high voltage load circuit.

23
Q

What is a thermocouple?

A

A device that produces electricity when two different metals are joined together are heated.

24
Q

What is an air handler?

A

A device used to distribute conditioned air to spaces in a building.

25
Q

What is supply air?

A

The mixture of outside air and return air that is conditioned for use in a building.

26
Q

What is a pneumatic operator?

A

A device that uses air pressure to position HVAC components.

27
Q

What do HVAC systems contain?

A

Heating elements, refrigeration systems,and air handlers.

28
Q

What is a damper?

A

A movable plate that controls airflow.

29
Q

What is Indoor air quality?

A

A description of the type and quantity of contaminants in indoor air.

30
Q

What can contribute to Indoor Air Quality(IAQ )problems?

A

Poorly designed, maintained, and installed HVAC systems.

31
Q

What is a cooling coil?

A

A finned heat exchanger that removes heat from air.

32
Q

What is Variable Air Volume(VAV) box?

A

A terminal unit that varies the amount of air flowing into a zone.

33
Q

What is short cycling?

A

The increase in the frequency of system operation due to improper feedback.

34
Q

What is a work order?

A

A document that details specific maintenance task to be completed.

35
Q

What is preventative maintenance?

A

Scheduled work required to keep equipment in peak operating condition.

36
Q

What is inventory control?

A

The organization and management of commonly used parts, vendors and suppliers, and purchasing records in the PM system.

37
Q

What is a reactive hazard?

A

The degree of susceptibility of materials to explode or release energy by themselves or by exposure to certain conditions or substances.

38
Q

What is a physical hazard?

A

A hazard caused by excessive levels of noise, vibration, illumination, temperature, of the ladder.

39
Q

What is hazardous material?

A

A substance that could cause injury to individuals or damage to the environment.

40
Q

What can be an air contaminate?

A

Dust, fumes, aerosols, fibers.

41
Q

What is required to start and sustain a fire.

A

Fuel, heat, and oxygen, also chemical agents.

42
Q

What is a regulation?

A

A rule made mandatory by a federal, state, or local government.

43
Q

What is a code?

A

A collection of regulations related to a particular trade or environment.

44
Q

What is a standard?

A

A collection of voluntary rules developed through consensus and related to a particular trade, industry, or environment.

45
Q

What is a flow chart used for?

A

To help a troubleshooter follow a logical path when solving a problem.

46
Q

What is sensible heat?

A

Heat energy that can be measured by a change in temperature.

47
Q

What is latent heat?

A

Heat energy that causes a change of state but no change in temperature.

Industrial Maintenance (2 decks)

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