Second Term

Question 1

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

Answer 1

Hydroelectric-power generation plant

Question 2

A power plant that uses steam to produce electricity.

Answer 2

Combustion-power generation plant

Question 3

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

Answer 3

Electricity

Question 4

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

Answer 4

Conductor

Question 5

A material that resists the flow of electrons.

Answer 5

Insulator

Question 6

The amount of electrons flowing through a conductor.

Answer 6

Current

Question 7

The amount of electrical pressure in a conductor.

Answer 7

Voltage

Question 8

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

Answer 8

Resistance

Question 9

Ohm’s law

Answer 9

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

Question 10

A current that flows in one direction only.

Answer 10

Direct current (DC)

Question 11

A current that reverses direction at regular intervals.

Answer 11

Alternating current (AC)

Question 12

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

Answer 12

Series circuit

Question 13

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

Answer 13

Parallel circuit

Question 14

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

Answer 14

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

Question 15

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

Answer 15

Inductance

Question 16

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

Answer 16

Transformer

Question 17

AN AC phase voltage that contains one alternating voltage waveform.

Answer 17

Single-phase

Question 18

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

Answer 18

Three-phase

Question 19

Five common residential and light commercial building power quality problems.

Answer 19

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

Question 20

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

Answer 20

Transient voltage

Question 21

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

Answer 21

Harmonics

Question 22

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.

Answer 22

Noise

Question 23

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

Answer 23

The stator

Question 24

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

Answer 24

The rotor

Question 25

What are common motor voltage ratings?

Answer 25

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

Question 26

What does FLA or RLA mean?

Answer 26

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

Question 27

What is the meaning of LRA?

Answer 27

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

Question 28

What is service factor(SF)?

Answer 28

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

Question 29

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

Answer 29

The larger of the two.

Question 30

What are insulation class ratings?

Answer 30

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

Question 31

The formula for finding synchronous speed of a motor?

Answer 31

Rpm= (120xf)/(Np)

Question 32

The two most common motor mounts.

Answer 32

The rigid mount and resilient mount.

Question 33

The purpose of a motor enclosure.

Answer 33

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

Question 34

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

Answer 34

A rigid coupling.

Question 35

What are the two general categories of flexible couplings?

Answer 35

Flange and sleeve.

Question 36

What is the purpose of a V-belt?

Answer 36

To drive fans and compressors.

Question 37

How do shaded-pole motors operate?

Answer 37

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

Question 38

Describe the operation of split-phase motors.

Answer 38

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

Question 39

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

Answer 39

Capacitor-start motor

Question 40

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

Answer 40

Capacitor-run motor

Question 41

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

Answer 41

Capacitor start-and-run motor

Question 42

How do induction motors operate?

Answer 42

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