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HVAC and Refrigeration Systems Training Manual > Second Term > Flashcards

Second Term Flashcards

1
Q

A power plant that changes energy from moving water into electrical energy.

A

Hydroelectric-power generation plant

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2
Q

A power plant that uses steam to produce electricity.

A

Combustion-power generation plant

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3
Q

The energy produced from the flow of electrons through a conductor.

A

Electricity

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4
Q

A material with low resistance that permits electrons to flow through it easily.

A

Conductor

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5
Q

A material that resists the flow of electrons.

A

Insulator

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6
Q

The amount of electrons flowing through a conductor.

A

Current

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7
Q

The amount of electrical pressure in a conductor.

A

Voltage

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8
Q

The amount of opposition a material has to the flow of electrons.

A

Resistance

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9
Q

Ohm’s law

A

E = I x R ( voltage = current x resistance)

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10
Q

A current that flows in one direction only.

A

Direct current (DC)

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11
Q

A current that reverses direction at regular intervals.

A

Alternating current (AC)

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12
Q

A circuit that has two or more components connect so that there is one path for current to flow.

A

Series circuit

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13
Q

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

A

Parallel circuit

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14
Q

How does resistance affect a load voltage drop in a series circuit?

A

High resistance will cause a higher voltage drop then a lower resistance.

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15
Q

The production of current flow due to a magnetic failed on a coil.

A

Inductance

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16
Q

An alternating current device that steps up our steps down voltage.

A

Transformer

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17
Q

AN AC phase voltage that contains one alternating voltage waveform.

A

Single-phase

18
Q

This AC phase voltage is a combination of three alternating voltage waveforms.

A

Three-phase

19
Q

Five common residential and light commercial building power quality problems.

A

Voltage interruptions, voltage fluctuation, transient voltages, harmonics, and noise.

20
Q

A temporary, unwanted voltage that ranges from a few volts to several thousand volts and lasts from a few microseconds to a few milliseconds.

A

Transient voltage

21
Q

A power frequencies that are whole integer multiples of the base frequency (60 Hz).

A

Harmonics

22
Q

A sine wave distortion from motors and electrical devices that enters a power distribution system directly on the wires/grounds or through the magnetic coupling of adjacent wires.

A

Noise

23
Q

The stationary part of a motor
that produces a rotating magnetic field.

A

The stator

24
Q

The moving part of a motor that spins in response to current flow.

A

The rotor

25
Q

What are common motor voltage ratings?

A

24v, 120v, 208v, and 230/460v

26
Q

What does FLA or RLA mean?

A

They both represent the amperage draw when a motor is at full load, aka full load amperage.

27
Q

What is the meaning of LRA?

A

This represents the amount of the current drawn of a rotor is unable to turn, is locked, or startup amperage, aka locked-rotor amperage.

28
Q

What is service factor(SF)?

A

A number that represents the amount of extra load that can be placed temporarily on a motor without causing damage.

29
Q

What size of motor is selected if a horsepower requirement falls between two standard horsepower ratings?

A

The larger of the two.

30
Q

What are insulation class ratings?

A

A rating that describes how hot a motor can safely operate in a specific ambient environment.

31
Q

The formula for finding synchronous speed of a motor?

A

Rpm= (120xf)/(Np)

32
Q

The two most common motor mounts.

A

The rigid mount and resilient mount.

33
Q

The purpose of a motor enclosure.

A

To promote safety, reduce maintenance, and to protect internal motor components from the external environment.

34
Q

An inflexible coupling that is used to join two precisely aligned shafts.

A

A rigid coupling.

35
Q

What are the two general categories of flexible couplings?

A

Flange and sleeve.

36
Q

What is the purpose of a V-belt?

A

To drive fans and compressors.

37
Q

How do shaded-pole motors operate?

A

They operate using single phase voltage, they develop low starting torque.

38
Q

Describe the operation of split-phase motors.

A

A single phase motor that has separate start windings and run windings.

39
Q

A split-phase motor that has increased starting torque due to a capacitor connected to the start windings.

A

Capacitor-start motor

40
Q

A split-phase motor that has increased running torque due to a capacitor connected at all times,

A

Capacitor-run motor

41
Q

A split-phase motor with two capacitors to allow greater torque during startup and running.

A

Capacitor start-and-run motor

42
Q

How do induction motors operate?

A

3 phase motors that create a rotating magnetic field in the stator windings, which induces opposite polarity magnetic fields in the rotor bars.

HVAC and Refrigeration Systems Training Manual (3 decks)

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