RADT 334 - UNIT 3 EXAM QUESTIONS
AND ANSWERS
semiconductor - Answer- A material that can conduct an electric current or not,
depending on the voltage applied across that material
AEC - Answer- An electronic device designed to terminate x-ray exposure after
properly exposing an image receptor
line compensation - Answer- A method of adjusting the voltage to the x-ray
imaging system to a constant value, in response to changes in voltage supplied by
the power company
capacitor - Answer- An electrical circuit device that stores electric charge
mA meter location - Answer- Placed in the tube circuit, connected at the center of
the secondary winding of the high-voltage step-up transformer in series with the x-
ray tube. This reduces the possibility of shock.
diode - Answer- An electrical device that contains two electrodes
voltage ripple - Answer- The fluctuation in the voltage applied to the x-ray tube
expressed as a percentage of peak kilovoltage
rectification - Answer- The process of changing alternating current and voltage
into direct current and voltage
autotransformer - Answer- A type of transformer having a single winding
power - Answer- The product of voltage and current. Watt.
302.5 V - Answer- 220 V is supplied across 1200 windings of the primary coil of
the autotransformer. If 1650 windings are tapped, what voltage will be supplied to
the primary coil of the high-voltage transformer?
71.7 volt peak - Answer- A kVp meter reads 86 kVp and the turns ratio of the
high-voltage step-up transformer is 1200. What is the true voltage across the meter?
5 V - Answer- The supply voltage from the autotransformer to the filament
transformer is 60 V. If the turns ratio of the filament transformer is 1/12, what is the
filament voltage?
, 6 amps - Answer- If the current in the primary of the filament transformer was 0.5
A with a turns ratio of 1/12, what would be the filament current?
104.5 kV - Answer- The suply to a high-voltage step-up transformer with a turns
ratio of 550 is 190 V. What is the voltage across the x-ray tube?
radiolucent - Answer- Allows relatively undiminished intensity of x-rays through
the tabletop
90/20 table - Answer- Allow relatively undiminished intensity of x-rays through the
tabletop
10. On/off control, kVp selection, mA selection, time (mAs) selection, and automatic-
exposure controls - Answer- List the five major controls on the operator's console.
purpose of the autotransformer - Answer- To vary and control the amplitude of the
voltage supplied to the high-voltage step-up transformer and the filament
transformer
primary/secondary voltage relationship in autotransformer - Answer- Primary
voltage and secondary voltage are in direct relation to the number of turns of the
transformer
What the prereading kVp meter allows - Answer- The precise adjustment of the
supply voltage and monitoring the kVp before the x-ray exposure
3.3 - Answer- 200 mA, 1/60s= what mAs?
18 - Answer- 600 mA, 30 ms = what mAs?
Difference between high voltage transformer and high voltage generator - Answer-
The high-voltage transformer is just one component of a high-voltage generator.
direct - Answer- In order that a reverse voltage is not applied across the x-ray
tube and that the tube operates most efficiently, x-ray tubes use ___ current.
rectification - Answer- Direct current is achieved in the x-ray circuit through
______.
100% - Answer- Voltage ripple of single-phase generator
14% - Answer- Voltage ripple of three-phase, six-pulse generator
4% - Answer- Voltage ripple of three-phase, twelve-pulse generator
AND ANSWERS
semiconductor - Answer- A material that can conduct an electric current or not,
depending on the voltage applied across that material
AEC - Answer- An electronic device designed to terminate x-ray exposure after
properly exposing an image receptor
line compensation - Answer- A method of adjusting the voltage to the x-ray
imaging system to a constant value, in response to changes in voltage supplied by
the power company
capacitor - Answer- An electrical circuit device that stores electric charge
mA meter location - Answer- Placed in the tube circuit, connected at the center of
the secondary winding of the high-voltage step-up transformer in series with the x-
ray tube. This reduces the possibility of shock.
diode - Answer- An electrical device that contains two electrodes
voltage ripple - Answer- The fluctuation in the voltage applied to the x-ray tube
expressed as a percentage of peak kilovoltage
rectification - Answer- The process of changing alternating current and voltage
into direct current and voltage
autotransformer - Answer- A type of transformer having a single winding
power - Answer- The product of voltage and current. Watt.
302.5 V - Answer- 220 V is supplied across 1200 windings of the primary coil of
the autotransformer. If 1650 windings are tapped, what voltage will be supplied to
the primary coil of the high-voltage transformer?
71.7 volt peak - Answer- A kVp meter reads 86 kVp and the turns ratio of the
high-voltage step-up transformer is 1200. What is the true voltage across the meter?
5 V - Answer- The supply voltage from the autotransformer to the filament
transformer is 60 V. If the turns ratio of the filament transformer is 1/12, what is the
filament voltage?
, 6 amps - Answer- If the current in the primary of the filament transformer was 0.5
A with a turns ratio of 1/12, what would be the filament current?
104.5 kV - Answer- The suply to a high-voltage step-up transformer with a turns
ratio of 550 is 190 V. What is the voltage across the x-ray tube?
radiolucent - Answer- Allows relatively undiminished intensity of x-rays through
the tabletop
90/20 table - Answer- Allow relatively undiminished intensity of x-rays through the
tabletop
10. On/off control, kVp selection, mA selection, time (mAs) selection, and automatic-
exposure controls - Answer- List the five major controls on the operator's console.
purpose of the autotransformer - Answer- To vary and control the amplitude of the
voltage supplied to the high-voltage step-up transformer and the filament
transformer
primary/secondary voltage relationship in autotransformer - Answer- Primary
voltage and secondary voltage are in direct relation to the number of turns of the
transformer
What the prereading kVp meter allows - Answer- The precise adjustment of the
supply voltage and monitoring the kVp before the x-ray exposure
3.3 - Answer- 200 mA, 1/60s= what mAs?
18 - Answer- 600 mA, 30 ms = what mAs?
Difference between high voltage transformer and high voltage generator - Answer-
The high-voltage transformer is just one component of a high-voltage generator.
direct - Answer- In order that a reverse voltage is not applied across the x-ray
tube and that the tube operates most efficiently, x-ray tubes use ___ current.
rectification - Answer- Direct current is achieved in the x-ray circuit through
______.
100% - Answer- Voltage ripple of single-phase generator
14% - Answer- Voltage ripple of three-phase, six-pulse generator
4% - Answer- Voltage ripple of three-phase, twelve-pulse generator
