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| what controls the xray tube current |
filament control device (mA selector) |
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usnavalmd Thu, 22 Jan 2009 00:06:22 GMT |
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| what provides the electrical power required to heat the filament of an xray tube |
filament circuit |
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usnavalmd Thu, 22 Jan 2009 00:06:22 GMT |
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| what is additional protection against overloading the circuit |
circuit breaker |
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usnavalmd Thu, 22 Jan 2009 00:06:22 GMT |
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| what are the names of the two switches that open and close the primary circuit |
timer & exposure switches |
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usnavalmd Wed, 21 Jan 2009 23:58:22 GMT |
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| permits adjustment of the line voltage to the correct value |
line voltage meter |
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usnavalmd Wed, 21 Jan 2009 23:57:56 GMT |
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| this detects fluctuations in the line of the primary circuit |
compensator voltmeter |
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usnavalmd Wed, 21 Jan 2009 23:57:56 GMT |
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| indicates the desired kV |
prereading kilovoltmeter |
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usnavalmd Wed, 21 Jan 2009 23:57:56 GMT |
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| changes the voltage supplied to the primary transformer |
autotransformer |
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usnavalmd Wed, 21 Jan 2009 23:53:10 GMT |
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| this protects equipment and reduce fire hazards |
fuse |
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usnavalmd Wed, 21 Jan 2009 23:53:10 GMT |
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| this is a double bladed single throw switch that is designed to break connection with both hot lines simultaneously |
main switch |
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usnavalmd Wed, 21 Jan 2009 23:53:10 GMT |
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| this includes all equipment connected between the electrical source and the primary coil of the xray transformer |
primary circuit |
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usnavalmd Wed, 21 Jan 2009 23:53:10 GMT |
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| what is the voltage supplied to the radiology department called |
line voltage |
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usnavalmd Wed, 21 Jan 2009 23:33:26 GMT |
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| what is the formula for the spinning top test |
# of pulses x exposure time = number of dots |
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usnavalmd Wed, 21 Jan 2009 23:33:26 GMT |
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| what is the only type of unit the spinning top test can be used on |
fully rectified single phase units only |
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usnavalmd Wed, 21 Jan 2009 23:33:26 GMT |
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| what is the simplest device for testing the competence of any type of rectifier diode |
spinning top |
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usnavalmd Wed, 21 Jan 2009 23:33:26 GMT |
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| 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 |
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usnavalmd Wed, 21 Jan 2009 23:26:11 GMT |
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| how many rectifiers are needed to achieve full rectification |
4 |
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usnavalmd Wed, 21 Jan 2009 23:26:11 GMT |
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| what are the two types of semiconductors in diode rectification |
n-type
p-type |
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usnavalmd Wed, 21 Jan 2009 23:26:11 GMT |
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| what are made of semiconductors of which silicon is the most commonly used |
diode rectification |
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usnavalmd Wed, 21 Jan 2009 23:26:11 GMT |
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| 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 |
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usnavalmd Wed, 21 Jan 2009 16:41:10 GMT |
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| what is the advantage of full wave rectification |
larger exposures can be used without damaging the tube |
1 |
usnavalmd Thu, 22 Jan 2009 00:16:14 GMT |
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| 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 |
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usnavalmd Tue, 20 Jan 2009 14:16:10 GMT |
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| by changing the negative half of the sine wave to the positive one therefor resulting in two voltage peaks per cycle |
full wave rectification |
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usnavalmd Tue, 20 Jan 2009 14:16:10 GMT |
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| 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 |
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usnavalmd Tue, 20 Jan 2009 14:16:10 GMT |
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| an electrical device that allows current to flow easily in only one direction |
rectifier |
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usnavalmd Tue, 20 Jan 2009 14:02:24 GMT |
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| the process of changing alternating current to direct current |
rectification |
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usnavalmd Tue, 20 Jan 2009 14:02:24 GMT |
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| it's operation is based on ohm's law converting electrical energy into heat |
rheostat |
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usnavalmd Tue, 20 Jan 2009 14:02:24 GMT |
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| 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 |
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usnavalmd Tue, 20 Jan 2009 14:02:23 GMT |
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| an electromagnetic device operating on the principle of self inductance and requires alternating current |
choke coil |
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usnavalmd Tue, 20 Jan 2009 13:12:44 GMT |
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| 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 |
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usnavalmd Tue, 20 Jan 2009 13:12:44 GMT |
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| a variable resistor which allows us to vary the resistance of a circuit |
rheostat |
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usnavalmd Tue, 20 Jan 2009 13:12:44 GMT |
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| what is the formula for autotransformer law |
ATVs/ATVp = # of tapped turns / # of primary turns |
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usnavalmd Tue, 20 Jan 2009 13:12:44 GMT |
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| the relationship of the voltage output to voltage input in an autotransformer is what |
autotransformer law |
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usnavalmd Tue, 20 Jan 2009 13:05:24 GMT |
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| the autotransformer is an electromagnetic device which operates on the principle of what |
self induction |
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usnavalmd Tue, 20 Jan 2009 13:05:03 GMT |
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| what is made up of a single coil of insulated wire wound around a large iron core |
autotransformer |
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usnavalmd Tue, 20 Jan 2009 13:05:03 GMT |
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| used in radiographic units to regulate the voltage available to the primary side of the high voltage transformer |
autotransformer |
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usnavalmd Tue, 20 Jan 2009 13:05:03 GMT |
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