Electricity
100 POINTS: This law describes the relationship between voltage, current, and resistance.
ANSWER: What is Ohm’s Law?
100 POINTS: These lines represent the direction and strength of a magnetic field.
ANSWER: What are flux lines?
100 POINTS: These packets of electromagnetic energy travel at the speed of light.
ANSWER: What are photons?
100 POINTS: This abbreviation refers to the smallest addressable unit in a digital detector.
ANSWER: What is a DEL (Detector Element)?
100 POINTS: This is the acceptable tolerance for kVp accuracy.
ANSWER: What is ±10%?
200 POINTS: This unit measures electrical current in a circuit.
ANSWER: What is the ampere?
200 POINTS: This law describes how a changing magnetic field induces electric current.
ANSWER: What is Faraday's Law?
200 POINTS: This part of the x‑ray tube is where thermionic emission occurs.
ANSWER: What is the cathode filament?
200 POINTS: This grid of rows and columns organizes digital image data.
ANSWER: What is the matrix?
200 POINTS: This organization accredits radiography programs like GTCC.
ANSWER: What is the JRCERT?
300 POINTS: This describes how resistance changes as the temperature of a conductor increases.
ANSWER: What is they increase together (directly proportional)?
300 POINTS: This is the minimum number of windings required for an autotransformer.
ANSWER: What is one?
300 POINTS: This component adjusts filament current in the x‑ray tube.
ANSWER: What is the rheostat?
300 POINTS: This is the minimum allowed distance between the x‑ray tube and patient on fixed fluoro units.
ANSWER: What is 15 cm?
300 POINTS: This is the required lead equivalency range for protective aprons.
ANSWER: What is 0.25–0.5 mm Pb?
400 POINTS: This value is found by dividing electric potential by current.
ANSWER: What is resistance?
400 POINTS: This transformer design is commonly used in x‑ray generators due to efficiency.
ANSWER: What is a shell‑type transformer?
400 POINTS: This device increases voltage to levels needed for x‑ray production.
ANSWER: What is the step‑up transformer?
400 POINTS: This post‑processing technique removes superimposed structures.
ANSWER: What is digital subtraction?
400 POINTS: This is the maximum exposure allowed for the back-up timer verification test.
ANSWER: What is within 6 seconds or at 600 mAs?
500 POINTS: Copper and aluminum fall under this category of materials because they allow electrons to flow easily.
ANSWER: What are conductors?
500 POINTS: This is the minimum number of coils needed for mutual induction.
ANSWER: What is two?
500 POINTS: These electronic devices convert AC into DC.
ANSWER: What are rectifier diodes?
500 POINTS: This equation—FOV divided by matrix size—calculates this important spatial parameter.
ANSWER: What is pixel size?
500 POINTS: This test ensures selected mA stations produce proportionate exposures.
ANSWER: What is the exposure linearity test?
600 POINTS: This electrical formula is used to calculate power.
ANSWER: What is P = V × I?
600 POINTS: Placing a wire loop in a changing magnetic field produces this.
ANSWER: What is current?
600 POINTS: This generator type uses a decreasing mA to achieve the shortest exposure time.
ANSWER: What is a falling‑load generator?
600 POINTS: In a digital receptor, this component stores electrical charge before readout.
ANSWER: What is the TFT?
600 POINTS: This is the range of accuracy that the SID distance should be.
ANSWER: What is plus/minus 10% of the selected SID?
700 POINTS: This term refers to the electrical ‘pressure’ that drives current through a circuit.
ANSWER: What is voltage?
700 POINTS: Mutual induction causes current in the secondary coil to flow in this direction relative to the primary coil.
ANSWER: What is the opposite direction?
700 POINTS: This percentage represents the ripple of a single‑phase generator.
ANSWER: What is 100%?
700 POINTS: This measures how efficiently a detector converts x‑ray photons into a useful image.
ANSWER: What is DQE?
700 POINTS: This is the maximum variation in kVp quality allowed for x-ray equipment.
ANSWER: What is plus/minus 10% or 5 kVp of the setting?
800 POINTS: Silicon and germanium belong to this class of materials with intermediate conductivity.
ANSWER: What are semiconductors?
800 POINTS: This SI unit measures magnetic field strength.
ANSWER: What is the tesla?
800 POINTS: This is the first major component that receives incoming power in the x‑ray circuit.
ANSWER: What is the autotransformer?
800 POINTS: This term describes the number of gray shades available per pixel.
ANSWER: What is bit depth?
800 POINTS: AEC chamber ion sensitivity must fall within this tolerance.
ANSWER: What is ±10%?
900 POINTS: This describes the relationship between conductor diameter and resistance.
ANSWER: What is inverse (bigger diameter = lower resistance)?
900 POINTS: This type of magnetism describes materials weakly attracted to magnetic fields such as gadolinium.
ANSWER: What is paramagnetism?
900 POINTS: Three‑phase, 6‑pulse full‑wave rectification produces this approximate ripple.
ANSWER: What is 13%?
900 POINTS: This process assigns numerical values to each pixel.
ANSWER: What is quantization?
900 POINTS: This is the standard HVL range for diagnostic x‑ray tubes.
ANSWER: What is 3–5 mm AlEq?
1000 POINTS: This calculation determines total resistance in a parallel circuit.
ANSWER: What is the reciprocal sum?
1/Rt = 1/R1 + 1/R2 + 1/R3
1000 POINTS: This classification describes materials weakly repelled by magnetic fields.
ANSWER: What is diamagnetism?
1000 POINTS: This is why AC must reach the step‑up transformer before rectification occurs.
ANSWER: What is because transformers require AC for mutual induction?
1000 POINTS: This computer correction uses histogram analysis to correct for exposure errors.
ANSWER: What is rescaling?
1000 POINTS: What does HIPAA stand for?
ANSWER: What is Health Insurance Portability and Accountability Act?