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Unit 1
Generators, Rectifiers and Transformers
83
Physics
Undergraduate 4
09/03/2013

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Term
Rectification
Definition
the process of converting AC to DC
Term
the process of converting AC to DC
Definition
Rectification
Term
Device which converts mechanical energy to electrical energy
Definition
Generator
Term
Generator
Definition
device the converts mechanical energy to electrical energy
Term
The maximum emf and current are induced in a conductor when:
Definition
the armature is at a right angle to the lines of force
Term
commutator
Definition
component of a DC generator
Term
the auto transformer operates on the principle of:
Definition
self-induction
Term
the generator is an expanded practical application of ________ experiments.
Definition
Faraday's
Term
solenoid
Definition
a coiled conductor carrying current
Term
a coiled conductor carrying current
Definition
solenoid
Term
frequency
Definition
the number of pulses occurring per second in a DC circuit
Term
the number of pulses occurring per second in a DC circuit
Definition
frequency
Term
device which varies the voltage to the primary side of the x-ray transformer
Definition
autotransformer
Term
where all rectifying devices are located
Definition
between the secondary side of the transformer and tube
Term
the emf induced in any secondary coil is:
Definition
directly related to the number of turns in the coil that links with the magnetic flux
Term
turns ratio
Definition
turns secondary: turns primary
Term
swirling currents set up in the core of the transformer
Definition
eddy currents
Term
eddy currents
Definition
swirling currents set up in the core of the transformer
Term
kv controls:
Definition
the quality of the x-ray beam
Term
the material that makes up solid state rectifiers
Definition
silicon
Term
moving electric charges
Definition
electrodynamics
Term
electrodynamics
Definition
moving electric charges
Term
factors which affect the magnitude of the induced current
Definition
- number of flux lines
- angle of interaction
- strength of magnetic field
Term
The principle behind the operation of a motor was based on experiments by:
Definition
Oersted
Term
The type of motor used to cause the anode to rotate
Definition
AC induction
Term
Transformer
Definition
A device that is capable of varying voltage and amperage over a circuit and operates on mutual induction.
Term
A device that is capable of varying voltage and amperage over a circuit and operates on mutual induction.
Definition
Transformer
Term
The type of transformer that loses power in the form of leakage flux
Definition
open-core
Term
The coils of a transformer are submerged in oil to provide:
Definition
- Insulation between the coils during operation
- A means to dissipate heat during operation
Term
hysteresis losses
Definition
Transformer loss caused by the rearrangement of magnetic domains in the core which leads to production of heat in the core
Term
Transformer loss caused by the rearrangement of magnetic domains in the core which leads to production of heat in the core
Definition
hysteresis losses
Term
the x-ray tube most operate on ____ current.
Definition
direct
Term
The standard current produced in the United States
Definition
60cps
Term
The component of a motor which turns within a series of electromagnets
Definition
rotor
Term
rotor
Definition
the component of a motor which turns within a series of eelectromagnets
Term
the negative terminal of an x-ray tube
Definition
filament
Term
The atomic diagram most frequently used to represent the atomic structure of an atom was proposed by:
Definition
Neils Bohr
Term
The amount of work the current can do per second
Definition
power
Term
power
Definition
the amount of work the current can do per second
Term
Electromagnetic induction can be accomplished by:
Definition
1. moving a wire thru a magnetic field
2. varying the strength of a magnetic field over a stationary wire
3. suspending a closed circuit within a fluctuation magnetic field
Term
Who discovered the experimental link connecting electric and magnetic forces?
Definition
Oersted
Term
The primary coil of the transformer
Definition
input side
Term
The max amount of emf and current is induced when an armature lies at a ______ angle.
Definition
90 degree
Term
Which type of curve represents alternating current?
Definition
sine wave
Term
the structure found on a DC generator that is not found on an AC generator
Definition
split ring / commutator
Term
transformers operate on _______ current
Definition
AC
Term
electric current is measured in units of:
Definition
amps
Term
electrical potential
Definition
the force that pushes electrons across a circuit
Term
the force that pushes electrons across a circuit
Definition
electrical potential
Term
the device that can change the potential difference in AC current
Definition
transformer
Term
a transformer operates on the principle of:
Definition
electromagnetic mutual induction
Term
the part that moves in the operation of a generator
Definition
armature
Term
Allows the technologist to achieve various penetrating powers across the x-ray tube
Definition
autotransformer / kV selector
Term
the exposure factor that controls the intensity of the radiation produced
Definition
mA
Term
tube current
Definition
the number of electrons moving across the tube
Term
the number of electrons moving across the tube
Definition
tube current
Term
What material is the filament composed of?
Definition
thoriated tungsten
Term
thermionic emission
Definition
the process of heating a metal to incandescence for the liberation of electrons
Term
the process of heating a metal to incandescence for the liberation of electrons
Definition
thermionic emission
Term
The focusing cup is composed of what material?
Definition
molybdenum or nickel
Term
The wave forms of which 2 types of rectification will result in identical curves?
Definition
self half-wave and half-wave
Term
the target of the x-ray tube is made out of which material?
Definition
tungsten-rhenium
Term
falling load generator
Definition
Begins the exposure at a high amperage and then decreases it throughout the exposure
Term
Begins the exposure at a high amperage and then decreases it throughout the exposure
Definition
falling load generator
Term
impedance
Definition
the opposition to the flow of current in a DC circuit
Term
the opposition to the flow of current in a DC circuit
Definition
impedance
Term
the number of rectifying devices incorporated into a circuit to accomplish full-wave rectification on a single phase unit
Definition
4
Term
The scientist whose experiments laid the groundwork down for the operation of the generator.
Definition
Faraday
Term
the device that operates on EM self-induction
Definition
autotransformer
Term
another name for a thyristor
Definition
silicon-controlled rectifier
Term
an atom that loses an electron
Definition
cation
Term
the ability to do work
Definition
energy
Term
Types of transformers
Definition
- aircore
- open core
- closed core
- shell type
Term
open-core transformer
Definition
has no iron core in the center
Term
open-core transformer
Definition
2 EMs, side by side
subject to leakage flux
Term
efficiency of transformers
Definition
95-98%
Term
Types of electrical power losses
Definition
- copper losses
- hysteresis loss
- eddy currents
Term
copper losses
Definition
inherent heat loss
Term
hysteresis loss
Definition
heat produced by constant rearrangements of the magnetic domains of the core
Term
Eddy currents
Definition
heat produced in the core due to swirling currents set up in the core by changing magnetic fields
Term
methods of rectification
Definition
- half wave rectification
- full wave rectification
- self rectification
Term
half-wave rectification
Definition
suppress the negative half of the AC cycle
Term
full-wave rectification
Definition
change the negative half into a positive
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