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Review For Board Exam > ENERGY CONVERSION/MOTORS/GENERATORS > Flashcards

ENERGY CONVERSION/MOTORS/GENERATORS Flashcards

1
Q

equivalent of or capacity of doing work

A

Energy

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2
Q

transformation of energy from one form to another. Energy in the forms provided by nature that can be used such as electricity.

A

Energy conversion

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3
Q

Two General Methods of Energy Conversions

A
  1. Direct Energy Conversion
  2. Dynamic Energy Conversion
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4
Q

Static without mechanical motion

A

Direct energy conversion

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5
Q

With Mechanical Motion

A

Dynamic energy conversion

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6
Q

somestimes called static energy-conversion devices. Most of these energy converters use electrons as their working fluid.

A

Direct energy-conversion devices

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7
Q

changes chemical energy directly into an electric current.

A

Electrochemical Cell

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8
Q

converts sun light into electricity

A

Solar cell

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9
Q

drives electrons across a potential difference at a semiconductor juction.

A

Radiant energy

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10
Q

used junctions formed by coating selenium (a semiconductor) with an extremely thin layer of gold.

A

Genuine solar cell

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11
Q

is often used interchangeably with photovoltaic cell, photocell, or photoelectric cell.

A

Solar cell

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12
Q

(seedback effect) are devices that convert heat directly into electricity.

A

Thermoelectric generators

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13
Q

generated when electrons are driven by thermal energy across a potential difference at the junction of two conductors made of dissimilar materials.

A

Electric current

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14
Q

junction of two conductors made of dissimilar materials.

A

Thermocouple

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15
Q

generate electricity when subjected to mechanical pressure.

A

Piezoelectric devices

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16
Q

electrochemical producer of electricity. continuous operations is achved by feeding fuel(hydrogen) and an oxidizer(oxygen) to the cell and removing the reaction products.

A

Fuel cell

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17
Q

direct energy converter with considerble potential. produces electricity directly from a high temperature, high pressure electrically conductive fluid (usually an ionized gas) moving through a strong magnetic field.

A

Magnetohydrodynamic

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18
Q

the terminal voltage of the battery with no load connection.

A

Open circuit voltage

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19
Q

the terminal voltage of the battery with load connection.

A

Operating voltage

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20
Q

the capacity of the battery which tells us how long the battery can supply a given load.

A

Ampere hour

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21
Q

when batteries are kept, the length of time under a specified condition that the battery retains its usability.

A

Shell life

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22
Q

cell cannot be recharged, cannot restore chemical reaction, whose chemical reaction is not reversible.

A

Primary cell

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23
Q

cell that can be recharged, can restore chemical reaction, whose chemical reaction is reversible.

A

Secondary cell

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24
Q

cell that have a very long shelf life.

A

Reserve cell or battery

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25
Q

mechanical rotating machine that converts mechanical energy to electrical energy or vice versa.

A

Dynamo

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26
Q

reversible machine can be used as a motor or generator.

A

Gamme dynamo

27
Q

Battery Ratings

A

*Open Circuit Voltage
*Operating Voltage
*Ampere-hour
*Shelf life

28
Q

DYNAMIC ENERGY CONVERSION-DEVICES

A

*Electrical Machines
*Generators
*Motors
*Rotary Converters
*Frequency Converter

29
Q

refer to rotating machines that convert energy from one form to another.

A

Electrical machines

30
Q

convert mechanical to electrical energy.

A

Generators

31
Q

convert electrical to mechanical energy.

32
Q

convert ac voltage to dc voltage, or vice versa.

A

Rotary converters

33
Q

convert ac voltage at one frequency to another ac voltage at another frequency.

A

Frequency converter

34
Q

Parts of Generators

A

*Prime Mover
*Output Voltage

35
Q

the source of mechanical power energy used to turn the rotor of the generator.

A

Prime mover

36
Q

the output electrical energy that is the result of rotating the rotor of the generator.

A

Output voltage

37
Q

TWO IMPORTANT PARTS OF A GENERATOR

A

*Field poles
*Armature winding

38
Q

even sets electromagnets or permanent magnets. Thi provides excitation or flux to the armature.

A

Field poles

39
Q

a laminated core with current-carrying copper wires. This will cut the flux supplied by the field poles.

A

Armature winding

40
Q

Dc generators

A

*Self-Eited Shunt Generator
*separately exited shunt generator
*Series Generators
*Compound Generators
Short and long shunt compound generators

41
Q

is the most important means of producing electrical power.

A

Ac generator

42
Q

Regardless of the size of ac generator they have two mechanical parts

A

*rotor
*stator

43
Q

is the part that rotates

44
Q

is the part that remains stationary

45
Q

armature is always the rotor

A

Dc generator

46
Q

the armature may be either rotor or stator

A

Alternators

47
Q

TYPES OF ALTERNATORS

A
  1. Rotating-armature alternator
  2. Rotating-field alternator
48
Q

This alternator is similar in construction to the dc generator in that he armature rotates in a stationary magnetic field.

A

ROTATING-ARMATURE ALTERNATOR

49
Q

The EMF generated in the armature windings converted from ac to dc means of the commutator.

A

DC GENERATOR

50
Q

The generated ac is brought to the load uncharged by means of slip rings. Generally not used to supply electric power in large quantities.

A

-ROTATING-ARMATURE ALTERNATOR

51
Q

The advantage of having a stationary armature winding is that the generated voltage can be connected directly to the load. A rotating armature requires slip rings and brushes to conduct the current from the armature to the load.

A

-ROTATING FIELD ALTERNATOR

52
Q

The prime movers is the source of the mechanical power that is required to turn the rotors of all generators, large or small, ac or dc.

A

-PRIME MOVERS

53
Q

The prime movers are divided into two classes of generators.

A

-HIGH SPEED AND LOW SPEED

54
Q

Examples of this prime movers are steam and gas turbine.

A

-HIGH SPEED

55
Q

Internal-combustion engines and electric motors are classified as one of the generators in prime movers.

A

-LOW SPEED

56
Q

In rotating field alternators

57
Q

There are two types of rotors

A
  1. TURBINE DRIVEN ROTOR
  2. SALIENT-POLE ROTOR
58
Q

Has winding that are arranged to form two or four distinct poles. These windings are firmly embeded in slots to withstand the tremendous centrifugal forces encountered at high speeds.

A

-TURBINE-DRIVEN ROTOR

59
Q

Is used in low speed alternators it consists often of several separately wound pole pieces bolted to the frame of the rotor.

A

-SALIENT-POLE ROTOR

60
Q

Two essential parts in rotating generators

A
  1. PERMANENT MAGNETS
  2. ARMATURE WINDING
61
Q

The voltage generated at the armature winding is always ac.

A

-ELECTRICAL MACHINES

62
Q

Alternating EMF at the armature winding is converted to DC by the commutator.

A

-DC GENERATOR

63
Q

The armature winding is rotated with respect to a stationary magnetic field produced by electromagnets or permanent magnets.

A

-DC GENERATORS

64
Q

The electromagnets or permanent magnets (magnetic fields) are rotated with respect to the stationary armature winding.

A

-AC GENERATORS

Review For Board Exam (17 decks)

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