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Flashcards in Fall 2016 Final Deck (102)
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61

Electromagnet=__1__ when electric current is supply to a coil of wire.

Temporary

62

Highly attracted to a magnet

Ferromagnetic
EX: iron,cobalt, nickel

63

Partially attracted to a magnet

Paramagnetic
EX: platinum, Gadolinium

64

Non-magnetic are ___ attracted

Not

65

Magnetic susceptibility

Permeability

66

Ability to retain magnetization

Retentivity

67

Soft iron= __1__ permeability and __2__ retentivity;
Hard steel= __3__ permeability and __4__ retentivity

1. High
2. Low
3. Low
4. High

68

Every current carrying wire is surrounded by a ______

Magnetic field

69

Helix with a current

Solenoid

70

Coil of wire

Helix

71

Solenoid with an iron core

Electromagnet

72

Strength of induced current in a wire is affect by:
1. _____ of magnetic field
2. _____ that wire cuts through magnetic field
3. _____ between wire and mag field
4. _____ of turns

1. Strength
2. Velocity
3. Angle
4. #

73

Ways to induce a current in a wire:
1.
2.
3

1. Pass wire through a magnetic field
2. Pass magnetic field OVER a wire
3. Allow a wire to lay with in varying strength magnetic field

74

Generator-a wire is placed within a __1__. If the wire is rotated, a current will be __2__ in a wire. AC generator uses __3__ and DC generator uses __4__.

1. Magnetic field
2. Induced
3. Slip rings
4. Commutator Ring

75

Motor-a wire is placed within a __1__. If electricity is applied to the wire, it will __2__.

1. Magnetic field
2. Rotate

76

Left hand thumb rule: wire grasp in hand...thumb indicates direction of __1__ and fingers indicate direction of __2__.

1. Current flow
2. Flux lines

77

Right hand thumb rule:
1. Thumb
2. Index
3. Middle
**MOTOR RULE**

1. Motion
2. Field
3. Current

78

Left hand rule:
1. Thumb
2. Index
3. Middle
**GENERATOR RULE**

1. Motion
2. Field
3. Current

79

Anode is rotated by and __1__ motor that has __2__ and __3__.

1. Induction
2. Rotor
3. Stator

80

Auto transformer= AC, __1__ kVp selector, __2__ coil of wire

1. Self induction
2. One

81

Transformer law

Vs = Ns
-- --
Vp Np

82

Step-up transformer=AC, __1__ induction, increases volt and decreases __2__, generates __3__, more turns on secondary side, __4__ wire on primary side.

1. Mutual
2. Amps
3. KVP
4. Thicker

83

Step-down transformer=AC, __1__ induction, decreases __2__ no increases __3__, heats filament for __4__ emission, more turns on primary side, __5__ wire on secondary side.

1. Mutual
2. Volts
3. Amps
4. Thermionic
5. Thicker

84

Lamination is

Layering

85

Lamination (layering) of core will help _____ transformer power losses

Decrease

86

Air core, open core, closed core, and shell type are __1__.
__2__ I most commonly used

1. Transformers
2. Shell type

87

Meters on all the time=line voltmeter, filament __1__, pre-reading __2__

1. Ammeter
2. Voltmeter

88

__1__ or __2__=Only registers during actual exposure=__3__

1. MAS
2. Milliammeter
3. Tube current

89

Line voltage compensator adjusts incoming volts to maintain _____

220V

90

EXs of Variable Resistors: __1__ coil, __2__, saturable reactor, high __3__ circuit.

1. Choke
2. Rheostat
3. Frequency