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RADT 1085 Final Exam Questions and Answers
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RADT 1085 Final Exam Questions and Answers
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RADT 1085 Final Exam Questions andAnswers
The changing of alternating current to direct current is known as what? - Answer -
Rectification
What is the name of the closed path over which electric current flows? - Answer -Circuit
What is a device called that allows current to flow in only one direction? - Answer -
Conductor
Which type of rectification will supply the x-ray tube with the greatest power? - Answer -
Full-wave
What is the voltage supplied to the autotransformer called? - Answer -Line voltage
What controls the incoming voltage to the autotransformer? - Answer -Main breaker switch
Which of the following is the most accurate timer? - Answer -Electronic timer
Tapping windings of the autotransformer to supply voltage to the step-up transformer is the
purpose of which of these? - Answer -kVp selector
If line voltage changes because of demands by other users, automatic adjustments are
made to which of the following? - Answer -Line voltage compensator
Which of the following is placed in the circuit in case of current changes during the
exposure? - Answer -Breaker switch
Where in the x-ray circuit is the timer located? - Answer -Between the autotransformer and
the step-up transformer
Most radiographic equipment manufactured today uses which type of x-ray generator? -
Answer -High-frequency
A high-frequency generator is operated at 100 kVp, 100 ms at 800 mA. What is the power
rating? - Answer -80 kW
What device would be used when the millamperage is set on the control panel? - Answer -
Rheostat
, Which of the following meters does NOT register until an x-ray exposure is made? -
Answer -Milliammeter
Which of the following types of current supplies the x-ray tube? - Answer -Pulsating direct
current
What effect does adjusting the filament control have on the production of x-rays? - Answer
-Controls the quantity
Which of the following is the current indicated by the millimmeter? - Answer -Tube current
The incoming line voltage is 220 volts. 55% of the turns on the autotransformer are used.
What is the voltage sent to the step-up transformer? - Answer -121 volts
How many solid state rectifiers are needed to produce a single-phase, full-wave rectified
current? - Answer -4
If a full-wave rectified current has 60 cycles per second, how many pulses per second
cross the x-ray tube? - Answer -120
A solid-state rectifier is primarily made of which of the following substances? - Answer -
Silicon
To produce equal density and contrast, exposure to the patient with three-phase
equipment is ____ compared to single-phase. - Answer -Equal
Which of the following generators has a voltage ripple of less than 1%? - Answer -High-
frequency
Which of the following is NOT an advantage of automatic exposure control (AEC)?
1. Eliminates the need to select mAs
2. Duplicates radiographic exposures
3. More latitude in patient positioning - Answer -3 only
Why are high-frequency generators more efficient at producing x-rays than single-phase
generators? - Answer -Voltage never drops to zero
Which of the following is NOT essential to the operation of automatic exposure controls
(AEC)? - Answer -Image intensifier
What are the two kinds of electrical charges? - Answer -positive and negative
What is the unit of electrical charge? - Answer -Coulomb
Which of the following statements is true? - Answer -Unlike charges attract each other
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