6550408
Descripción
Test por Analisa Olivarez, actualizado hace más de 1 año
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Creado por Analisa Olivarez
hace alrededor de 8 años
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Pregunta 1
Pregunta
Which Scientist discovered that a magnetic field always surrounds a conductor in which an electric current is flowing?
Respuesta
-
Hans Oersted
-
Michael Faraday
Pregunta 2
Pregunta
The Magnetic Field will only exist around a wire while the electric current _________ flowing.
Respuesta
-
is
-
is not
Pregunta 3
Pregunta
No Electric Current = No Magnetic Field
Respuesta
- True
- False
Pregunta 4
Pregunta
The Magnetic Field collapses when the current is __________________.
Respuesta
-
terminated
-
flowing
Pregunta 5
Pregunta
If the switch is ____________, there will be no current.
Respuesta
-
open
-
closed
Pregunta 6
Pregunta
If the switch is _____________, there will be a current flowing.
Respuesta
-
closed
-
open
Pregunta 7
Pregunta
Magnetic Field lines form ______________ around the wire.
Respuesta
-
Circles
-
Extra lines
Pregunta 8
Pregunta
The closer to the wire, the _____________ the Magnetic Field.
Respuesta
-
stronger
-
weaker
Pregunta 9
Pregunta
If the wire is a loop, the Magnetic Field lines are concentrated (strongest) on the ____________ of the loop.
Respuesta
-
inside
-
outside
Pregunta 10
Pregunta
If you stack many loops together (coil) with an electric current flowing, the Magnetic Field ______________.
Respuesta
-
increases
-
decreases
Pregunta 11
Pregunta
A coil of wire with an electric current is a _______________.
Respuesta
-
Solenoid
-
Electromagnet
-
Ferromagnet
-
Step-up Transformer
Pregunta 12
Pregunta
The Magnetic Field can be intensified further by wrapping a coil of wire around a _________________ material.
Respuesta
-
ferromagnetic
-
diamagnetic
-
paramagnetic
-
non-magnetic
Pregunta 13
Pregunta
The majority of the magnetic field lines are ____________ the coil.
Respuesta
-
inside
-
outside
Pregunta 14
Pregunta
"The Magnetic Field can be intensified further by wrapping a coil of wire around a ferromagnetic material (iron)". This is considered _____________________.
Respuesta
-
Artificially
-
Naturally
-
Electromagnet
Pregunta 15
Pregunta
A(n) ________________ is a current-carrying coil of wire wrapped around an iron-core, which intensifies the Magnetic Field.
Respuesta
-
Natural Magnet
-
Artificial Magnet
-
Electromagnet
-
Solenoid
Pregunta 16
Pregunta
A Solenoid can be used as a remote control magnet.
Respuesta
- True
- False
Pregunta 17
Pregunta
In Radiography, a _______________ is used as a tube stand lock and bucky tray lock.
Respuesta
-
Solenoid
-
Stator
-
Rotor
-
Transformer
Pregunta 18
Pregunta
When you open and close a switch an electric current starts and ______________.
Respuesta
-
stops
-
continues
Pregunta 19
Pregunta
What did Faraday want to prove?
Respuesta
-
That Oersted's experiment was true.
-
The opposite of Oersted's experiment.
Pregunta 20
Pregunta
Faraday concluded that an electric current _________ be induced by the presence of a magnet.
Respuesta
-
can
-
cannot
Pregunta 21
Pregunta
When a magnet is in motion, the intensity changes, an electric current is ________________.
Respuesta
-
produced
-
absent
Pregunta 22
Pregunta
The changing of the Magnetic Field to produce an electric current is _______________________.
Respuesta
-
Electromagnetic Induction
-
Heat
-
Step-Up Transformer
-
Step-Down Transformer
Pregunta 23
Pregunta
Electromagnetic Induction is AKA ______________________ law.
Respuesta
-
Oersted's
-
Faraday's
Pregunta 24
Pregunta
The basis of Faraday's Law was that ____________ Magnetic Field intensity induces an electric current.
Respuesta
-
varying
-
constant
Pregunta 25
Pregunta
The magnitude of the induced current depends on four factors. The strength of the magnetic field is one of them.
Respuesta
-
True
-
False
Pregunta 26
Pregunta
Select the following factors that induce the magnitude of the current:
Respuesta
-
The strength of the magnetic field
-
The velocity of the magnetic field as it moves past the conductor
-
The angle of the conductor to the magnetic field
-
The number of turns in the conductor
-
The rotating speed of the Anode target
-
Direct Current
-
Alternating Current
Pregunta 27
Pregunta
Electric Motors and Generators are NOT good examples of Oersted's and Faraday's Laws.
Respuesta
- True
- False
Pregunta 28
Pregunta
In Radiography, an electric induction motor is used to _____________________.
Respuesta
-
Rotate the Anode target
-
Turn the Cathode
-
Neither
Pregunta 29
Pregunta
Within the Electric motor, what is considered the "Fixed Electromagnetic's"?
Respuesta
-
Stator
-
Rotor
Pregunta 30
Pregunta
The Electric Motor is a good example of __________________ Law(s).
Respuesta
-
Oersted's
-
Faraday's
-
Einstein's
-
Oersted's and Faraday's
Pregunta 31
Pregunta
Within the Electric Motor, what is considered "copper bars and iron core"?
Respuesta
-
stator
-
rotor
Pregunta 32
Pregunta
_______________________ is supplied to the AC induction motor.
Respuesta
-
Direct Current
-
Alternating Current
Pregunta 33
Pregunta
In an AC induction motor the EXTERNAL Magnetic Field is supplied by an _________ number of fixed electromagnets called a stator.
Respuesta
-
odd
-
even
Pregunta 34
Pregunta
A ___________ is placed inside this arrangement of stators as the armature.
Respuesta
-
Rotor
-
Electromagnet
-
Anode
-
Coil
Pregunta 35
Pregunta
The AC current supplying one opposite pair of coils is ___________ phase with the current supplying the next pair of coils.
Respuesta
-
out of
-
in
Pregunta 36
Pregunta
In the production of diagnostic x-rays, it is necessary to ______________ the incoming line voltage of 110 or 220 into the kilovoltage range.
Respuesta
-
increase
-
decrease
Pregunta 37
Pregunta
A transformer does convert one energy to another.
Respuesta
- True
- False
Pregunta 38
Pregunta
Electric Potential AKA ____________________.
Respuesta
-
Voltage
-
Current
-
Electromagnet
-
Flow of electrons
Pregunta 39
Pregunta
Current AKA ____________________.
Respuesta
-
Flow of electrons
-
Voltage
-
Electromagnet
-
Electric Potential
Pregunta 40
Pregunta
A Transformer transforms electric potential (voltage) and current (flow of electrons) into higher or lower intensity.
Respuesta
- True
- False
Pregunta 41
Pregunta
A transformer changes the intensity of alternating ________________ and _______________.
Respuesta
-
voltage, current
-
coils, voltage
-
current, coils
-
Primary coil, Secondary coil
Pregunta 42
Pregunta
Consider an electromagnet with a FERROMAGNETIC core bent around so that it forms a continuous loop.
Respuesta
-
Secondary Coil
-
Primary Coil
Pregunta 43
Pregunta
Transformers.
There are no end surfaces from which the field lines can escape.
Respuesta
- True
- False
Pregunta 44
Pregunta
Transformers.
The __________________ tends to be confined to the loop of the magnetic core material.
Respuesta
-
Magnetic Field
-
Anode
-
Cathode
-
Primary Coil
Pregunta 45
Pregunta
Another coil wound around the other side of the loop of core material.
Respuesta
-
Secondary Coil
-
Primary Coil
Pregunta 46
Pregunta
Will the Magnetic Field produced by the PRIMARY coil pass through the center of the SECONDARY coil?
Respuesta
-
Yes
-
No
Pregunta 47
Pregunta
A good _____________ is created between the magnetic field produced by the primary coil and the secondary coil.
Respuesta
-
coupling
-
current
-
voltage
Pregunta 48
Pregunta
The PRIMARY (input) coil is supplied with ____________________. *Establishing a magnetic field around the coil.
Respuesta
-
Alternating Current
-
Direct Current
Pregunta 49
Pregunta
Which coil is responsible for establishing a magnetic field around the coil?
Respuesta
-
Primary (input) coil
-
Secondary (output) coil
Pregunta 50
Pregunta
The Primary Magnetic Field will cut the __________________ coil and induce an Electromagnetic Field (EMF) and alternating current (AC).
Respuesta
-
Secondary (output)
-
Primary (input)
Pregunta 51
Pregunta
A changing current in the primary coil induces a changing current in the secondary coil.
Respuesta
- True
- False
Pregunta 52
Pregunta
A Transformer will operate only with changing current, ________________________.
Respuesta
-
Direct Current
-
Alternating Current
Pregunta 53
Pregunta
The transformer is used to change the magnitude of _____________ and current in an AC circuit.
Respuesta
-
voltage
-
primary coil (input)
-
secondary coil (output)
-
efficiency
Pregunta 54
Pregunta
The change in voltage is _____________ proportional to the ratio of number of turns (winding's) of the secondary coil (Ns) to the number of turns in the primary coil (Np).
Respuesta
-
Directly
-
Inversely
Pregunta 55
Pregunta
Voltage is induced in each of the turns of the _________________ coil.
Respuesta
-
Primary (input)
-
Secondary (output)
Pregunta 56
Pregunta
Turns Ratio:
Respuesta
-
Ns/Np
-
Np/Ns
Pregunta 57
Pregunta
Secondary coil turns are 10 times more than the Primary coil turns.
Respuesta
- True
- False
Pregunta 58
Pregunta
The turns ratio is part of the _________________ Law Formula.
Respuesta
-
Transformer
-
Faraday
-
Oersted
-
Einstein
Pregunta 59
Pregunta
What is the Transformer Law?
Respuesta
-
Vs/Vp = Ns/Np
-
Vp/Vs = Np/Ns
-
Vp/Vs = Ns/Np
-
Vs/Vp = Np/Ns
Pregunta 60
Pregunta
A step-up transformer ____________ the potential difference.
Respuesta
-
increases
-
decreases
Pregunta 61
Pregunta
A step-up transformer will have a turn ratio greater than ___________.
Respuesta
-
one
-
two
-
ten
-
five
Pregunta 62
Pregunta
Does a step-up transformer have more turns in the secondary coil or primary coil?
Respuesta
-
Secondary
-
Primary
Pregunta 63
Pregunta
Step-Up transformer:
_________________ EMF (voltage)
Respuesta
-
Increases
-
Decreases
Pregunta 64
Pregunta
Step-Up transformer:
________________ current
Respuesta
-
Increases
-
Decreases
Pregunta 65
Pregunta
Step-Up transformer:
_________________ is doubled, ______________ is halved.
Respuesta
-
Voltage, Current
-
Current, Voltage
Pregunta 66
Pregunta
A Step-Down transformer _________________ the potential difference.
Respuesta
-
increases
-
decreases
Pregunta 67
Pregunta
A Step-Down transformer will have a turn ratio of less than ___________.
Respuesta
-
one
-
two
-
ten
-
five
Pregunta 68
Pregunta
With the Step-Down transformer there are more turns in the __________________ coil than the _________________ coil.
Respuesta
-
Primary, Secondary
-
Secondary, Primary
Pregunta 69
Pregunta
Step-Down Transformer:
________________ EMF (voltage)
Respuesta
-
Decreases
-
Increases
Pregunta 70
Pregunta
Step-Down Transformer:
__________________ current
Respuesta
-
Increases
-
Decreases
Pregunta 71
Pregunta
Step-Down Transformer:
_____________________ is halved, _________________ doubles
Respuesta
-
Voltage, Current
-
Current, Voltage
Pregunta 72
Pregunta
In a Step-Up transformer, the current on the secondary side is ______________ than the current on the primary side.
Respuesta
-
larger
-
smaller
Pregunta 73
Pregunta
In a Step-Down transformer, the secondary current is _____________ than the primary current.
Respuesta
-
larger
-
smaller
Pregunta 74
Pregunta
According to ______________'s Law, Voltage and Current are inversely proportional.
Respuesta
-
Ohm
-
Faraday
-
Oersted
-
Einstein
Pregunta 75
Pregunta
The # of transformer turns and induced amperage must also be inversely proportional.
Respuesta
- True
- False
Pregunta 76
Pregunta
The Effect of Transformer Law on Current may be written as:
Respuesta
-
Is/Ip = Np/Ns
-
Ip/Is = Np/Ns
-
Ip/Is = Ns/Np
-
Is/Ip = Ns/Np
Pregunta 77
Pregunta
A _________________-core transformer consists of heavily insulated coils wound around a square or circular iron core.
Respuesta
-
Open
-
Closed
Pregunta 78
Pregunta
The ___________________ core is not a single piece but rather built up of laminated layers of iron.
Respuesta
-
Ferromagnetic
-
Diamagnetic
-
Non-magnetic
-
Paramagnetic
Pregunta 79
Pregunta
Laminated layers help reduce ______________ loses, resulting in greater efficiency.
Respuesta
-
energy
-
magnitude
-
current
-
voltage
Pregunta 80
Pregunta
An AUTO-TRANSFORMER consists of an iron core with ____________ winding wire around it.
Respuesta
-
one
-
two
-
five
-
ten
Pregunta 81
Pregunta
The single wire on the AUTO-TRANSFORMER acts as __________________.
Respuesta
-
both the primary and secondary winding.
-
the primary winding
-
the secondary winding
-
neither
Pregunta 82
Pregunta
Which transformer operates using self-induction?
Respuesta
-
Transformer
-
AutoTransformer
Pregunta 83
Pregunta
Autotransformer:
Connections are made at ___________ points on the coil for both the primary and secondary sides.
Respuesta
-
same
-
different
Pregunta 84
Pregunta
Autotransformers are usually larger than regular transformers.
Respuesta
- True
- False
Pregunta 85
Pregunta
Autotransformers are generally used when a ___________ step-up or step-down in voltage is required.
Respuesta
-
small
-
large
Pregunta 86
Pregunta
A _______________ transformer consists of a laminated silicon steel core with two rectangular holes and a central section.
Respuesta
-
shell-type
-
regular
-
auto
Pregunta 87
Pregunta
The insulated coils on a Shell-Type transformer are wound around the ________________ section of the core.
Respuesta
-
central (center)
-
outside
-
top
-
bottom
Pregunta 88
Pregunta
Shell-Type Transformer:
Insulated coils are wound around the central section of the core to __________ the distance magnetic flux has to travel between the two coils.
Respuesta
-
increase
-
reduce
Pregunta 89
Pregunta
A Shell-Type Transformer reduces the distance the magnetic flux has to travel and therefore decreases the leakage flux.
Respuesta
- True
- False
Pregunta 90
Pregunta
Which transformer is the most currently used type of transformer?
Respuesta
-
Shell-Type
-
Regular
-
Auto
Pregunta 91
Pregunta
Which transformer is more efficient?
Respuesta
-
Shell-type
-
Auto
-
Regular
Pregunta 92
Pregunta
The effectiveness of _____________ induction is increased with Shell-type Transformer.
Respuesta
-
Mutual
-
Self
Pregunta 93
Pregunta
Transformers:
There is a normal ____________ loss of power in the secondary circuit from heat production that occurs due to resistance.
Respuesta
-
5%-10%
-
10%-50%
-
1%-5%
-
15%-20%
Pregunta 94
Pregunta
An AutoTransformer is considered a(n) _____________ selector.
Respuesta
-
kVp
-
mA
-
s
Pregunta 95
Pregunta
A Step-Up transformer is AKA a _________-Voltage Transformer.
Respuesta
-
High
-
Low
Pregunta 96
Pregunta
A Step-Down Transformer is AKA a(n) ______________ Transformer.
Respuesta
-
Filament
-
High
Pregunta 97
Pregunta
Which Transformer increases the tube voltage to kV?
Respuesta
-
Step-Up
-
Step-Down
Pregunta 98
Pregunta
Which Transformer decreases tube current to mA?
Respuesta
-
Step-Up
-
Step-Down
Pregunta 99
Pregunta
Which Transformer reduces voltage?
Respuesta
-
Step-Up
-
Step-Down
Pregunta 100
Pregunta
Which Transformer increases the filament amperage for thermionic emission?
Respuesta
-
Step-Up
-
Step-Down
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