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Elementary Electrical Engineering (AC/DC) > AC Machines > Flashcards

AC Machines Flashcards

1
Q

referred to as alternators

A

AC generator

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2
Q

almost all electric power for homes and industries is supplied by this

A

alternators

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3
Q

consists of constant magnetic field, conductors that rotate across the magnetic field, and some means to connect the conductors as they are rotating

A

AC generator

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4
Q

Types of Alternator

A

DC alternator, AC alternator

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5
Q

produces alternating current that is converted to direct current; found on smaller aircraft

A

DC alternator

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6
Q

produces a great deal of power, typically found on larger aircraft

A

AC alternator

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7
Q

You can also define an alternator depending on its ______ and ______.

A

stator, rotor

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8
Q

similar in construction from DC generators; setup is typically found in alternators that have low power rating

A

Revolving-armature type alternator

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9
Q

has both a stator and a rotor; armature is connected directly to the load without sliding contacts in the load circuit

A

Revolving-field type alternator

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10
Q

stator is made up of several windings connected in series to form a single circuit

A

Single-phase alternator

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11
Q

has two or more single phase windings; windings are electrically separated from each other so that one would cut the maximum number of flux lines, and the other one would not cut any

A

Two-phase alternator

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12
Q

referred to as ‘polyphase alternator’

A

Three-phase alternator

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13
Q

it has three single-phase windings spaced so that the voltage induced in each windings is ____ out of phase with the voltage in the other two windings

A

Three-phase alternator, 120 degrees

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14
Q

most powerplant utilize this concept for it allows an increase in power

A

operating in parallel (paralleling generators)

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15
Q

To parallel two generators, their terminal voltages must be _____, and voltages must be _______, as well as their frequencies must be equal.

A

equal, in phase

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16
Q

when conditions in parallel generators are met, they are now operating in ______

A

synchronism

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17
Q

the process of getting the generators into synchronism is called

A

synchronizing

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18
Q

consists of a frame (yoke) and two end brackets (bearings housing)

A

enclosure

19
Q

holds the components together and protects it

A

enclosure

20
Q

permits the cooling air to flow through the motor

A

open enclosure

21
Q

limits the flow of air into the motor

A

totally enclosed enclosure

22
Q

Types of Totally Enclosed Enclosure

A

totally enclosed non-ventilated enclosure, totally enclosed fan-cooled enclosure, explosion-proof enclosure

23
Q

2 Main Parts of Stator

A

stator core, stator windings

24
Q

an electromagnet when built and current is applied

A

stator

25
Q

made up of many thin metal sheets known as laminations

A

stator core

26
Q

thin metal sheets making up the stator core

A

laminations

27
Q

used to reduce energy losses

A

stator core

28
Q

directly connected in the power source

A

stator windings

29
Q

rotating part of the electromagnetic circuit

A

rotor

30
Q

mounted on the shaft and support the rotor to turn

A

bearings

31
Q

metal box on motor which protects one or more terminal boards

A

conduit box

32
Q

Two Types of Commutator Motor

A

AC Series Motor, Repulsion Motor

33
Q

known as the universal motor

A

AC series motor

34
Q

repulsion motor has an armature and commutator similar to that of a dc motor; brushes are not connected to the supply but are short-circuited

A

repulsion motor

35
Q

not self-starting; magnetic field set up in the stator by the ac power supply stays lined up in one direction

A

induction motor

36
Q

if two stator windings of unequal impedance are spaced 90 degrees apart but connected in parallel to a single-phase source, the filed produced will appear to rotate

A

Split-Phase Motor

37
Q

Two Types of Split-Phase Motor

A

Capacitor Start Motor, Permanent Capacitor Motor

38
Q

windings connected to a commutator

A

repulsion start induction motor

39
Q

a shaded pole is produced by a short-circuited coil wound around a part of each pole of a motor

A

shaded-pole motor

40
Q

several types exist to drive electric clocks, phonograph, turntables, and other devices requiring precise rotation

A

synchronous motor

41
Q

most used type of AC motor because of its simple, rugged construction, and good operating characteristics

A

induction motors

42
Q

laminated core with conductors placed parallel to the shaft

A

squirrel cage motor

43
Q

insulated winding similar to the stator winding

A

wound rotor motor

44
Q

rotor circuit is excited and have stators that produced rotating magnetic fields

A

synchronous motors

Elementary Electrical Engineering (AC/DC) (9 decks)

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