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Rad Physics 2-Unit 1
X-Ray Circuit
Question | Answer |
---|---|
Table tops are typically made of _________ _________ because it _________ very little of the __________ _________. | Carbon Fiber; Absorbs; Primary Beam |
Most table tops are _________ ________ which allow movement in all directions. | Floating tops |
Most fluoroscopy tables tilt at least _______ to the foot and ________ to the head and are referred to as ________ tables. | 90°; 30°; 90/30 |
Autotransformers work because of ___________ _______ induction. | Electromagnetic self induction |
Step Up/Step Down transformers work because of ___________ ____________ induction | Electromagnetic Mutual Induction |
Where are the main fuses located in a X-Ray circuit? | Incoming Line Voltage |
Where should the line voltage compensator be? | Primary side of the Autotransformer |
Where is the kVp selector located? | Attached to the secondary side of the autotransformer |
The Prereading Voltmeter is located where and how is it connected? | Located on the secondary side of the autotransformer; connected in parallel |
Where is the Exposure Switch & Timer located in the circuit? | Between the secondary side of the autotransformer and the primary side of the step up transformer |
Where is the milliamp meter located? | In the middle of the secondary side of the step up transformer. |
The filament circuit contains a ____________ transformer to increase the __________ to the _____________ of the x-ray tube. _______ Selector | Step-down; Amperage; Filament; mAs |
The mA selector and the filament ammeter are both located where? | On the primary side of the step down transformer |
The mA selector is a ___________ type of selector. | Rheostat |
How is the filament ammeter connected? | In series (primary side of step down transformer) |
Where is the rectification located? | Between the secondary side of the step up transformer and the x-ray tube |
Where are the timers located? | After the autotransformer on the primary side of the step up transformer |
Mechanical timers can only be used for exposures greater than ____________. | 250 ms |
Synchronous timers have a __________ motor and operate on a _______ cycle current. The shortest exposure time that can be used is ______ and increase by multiples of ______. | synchronous; 60; 1/60 sec; 1/60. |
The most sophisticated, complicated and accurate timers are ___________ timers. They are also the most common and have exposure times as low as __________. | Electronic; 1 millisecond (1/1000) |
mAs timers are typically __________ timers and monitor the product of ______ and _______. | Electronic; mA and Time |
mAs timers are located on the _____________ side of the ___________ transformer. | Secondary; Step Up |
Rectification is for _________ ___________ control. | Voltage Polarity |
Rectification ensures that voltage is always being fed from _________ to __________ in the x-ray tube and converts ______ current to _____ current. | Cathode to anode; AC; DC |
Self rectification is where the ___________ rectifies itself and is found in _________ __________ and can only handle _______ technique. | x-ray tube; small portables; low |
Self rectification and half rectification only produce x-rays every ________ second. | 1/120 |
A diode is the electronic version of the ___________ valve. They only permit the flow of electricity in _______ direction. | Check valve; One |
The 2 types of diodes are _________ ________ diode and __________ _________ diode. | Vacuum tube; Solid State |
The solid state diode resembles an _________ yet the current flow goes in the _________ direction. | Arrow; Opposite |
A ____________ Rectification uses either one or two valve tubes. | Half Wave |
What do Half Wave Rectifications prevent? | They prevent the current from reaching the anode on the reverse bias. |
A Half Wave Rectification eliminates the _________ __________ and allows __________ technique than self rectification. | Reverse Bias; Higher |
A Full Wave Rectification uses _______ valve tubes that are _______ ________ rectifiers. | Four; Solid State |
A Full Wave Rectification is also called a ________ _________ Rectification. | Graetz Bridge Rectification |
Thermionic Diodes are what type of rectifiers? | Valve Tubes |
A P-N Junction is what type of rectification? | Solid State Diodes |
In the solid state diodes, electrons jump the __________ _________ from _________ charge to ___________ charge. | Forbidden Zone; negative; Positive |
What is used to replace full wave or 3 phase rectification? | High Frequency Generators |
High frequency generators provide a nearly constant ____________ _____________ waveform; are very ___________ and _____________; and have about a _______ % ripple. | potential voltage; Small & Cheaper; 1% ripple |
High frequency generators use an _____________ circuit which are high speed switches or choppers that convert _______ into a series of _______ pulses. | Inverter; DC; Square pulses |
Self-rectification is a _______% ripple. | 200% |
Half-wave and Full-wave rectification are both ________% ripple. | 100% |
3-Phase, 6-Pulse rectification is a ______% ripple. | 13% |
3-Phase, 12-Pulse rectification is a _____% ripple. | 4% |
High Frequency = _____% ripple; Steady DC is _____% ripple. | <1%; 0% |
The lower the ripple percentage equals _______ x-ray intensity, _______ often. | Higher intensity; more often |
Spinning Top Tests are used to evaluate the accuracy of the __________ and make sure the _______________ system is working properly. | Timer; Rectification |