Study Physics 8.12-8.16 Flash Cards

 
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Physics 8.12-8.16

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what is the advantage of full wave rectification
larger exposures can be used without damaging the tube
what controls the xray tube current
filament control device (mA selector)
what provides the electrical power required to heat the filament of an xray tube
filament circuit
what is additional protection against overloading the circuit
circuit breaker
what are the names of the two switches that open and close the primary circuit
timer & exposure switches
permits adjustment of the line voltage to the correct value
line voltage meter
this detects fluctuations in the line of the primary circuit
compensator voltmeter
indicates the desired kV
prereading kilovoltmeter
changes the voltage supplied to the primary transformer
autotransformer
this protects equipment and reduce fire hazards
fuse
this is a double bladed single throw switch that is designed to break connection with both hot lines simultaneously
main switch
this includes all equipment connected between the electrical source and the primary coil of the xray transformer
primary circuit
what is the voltage supplied to the radiology department called
line voltage
what is the formula for the spinning top test
# of pulses x exposure time = number of dots
what is the only type of unit the spinning top test can be used on
fully rectified single phase units only
what is the simplest device for testing the competence of any type of rectifier diode
spinning top
what is the principal disadvantage of self rectification
low heat loading capacity of an xray tube in such a circuit and exposure factors must be limited to lower values
how many rectifiers are needed to achieve full rectification
4
what are the two types of semiconductors in diode rectification
n-type
p-type
what are made of semiconductors of which silicon is the most commonly used
diode rectification
what is it called when the xray tube allows passage of electrons only from the cathode to the anode during the positive half cycle of the AC curve
self rectification
what is the disadvantage of full wave rectification
using the entire AC wave results in the production of a high percentage of low energy xrays, or low kV range
by changing the negative half of the sine wave to the positive one therefor resulting in two voltage peaks per cycle
full wave rectification
by suppressing that half of the AC cycle represented by the portion of the curve that lies below the line is called what
half-wave rectification
an electrical device that allows current to flow easily in only one direction
rectifier
the process of changing alternating current to direct current
rectification
it's operation is based on ohm's law converting electrical energy into heat
rheostat
it's operation depends on the electromagnetic principle that the inductance of the coil increases as the degree of saturation of the core increases
saturable reactor
an electromagnetic device operating on the principle of self inductance and requires alternating current
choke coil
what consists of a series of resistor coils and a sliding tap which can be moved to increase or decrease the resistance in the circuit
rheostat
a variable resistor which allows us to vary the resistance of a circuit
rheostat
what is the formula for autotransformer law
ATVs/ATVp = # of tapped turns / # of primary turns
the relationship of the voltage output to voltage input in an autotransformer is what
autotransformer law
the autotransformer is an electromagnetic device which operates on the principle of what
self induction
what is made up of a single coil of insulated wire wound around a large iron core
autotransformer
used in radiographic units to regulate the voltage available to the primary side of the high voltage transformer
autotransformer
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