ARRT Radiography Practice Test
ARRT Equipment Operation & QA Practice Questions
Equipment Operation & QA makes up 6 of every 50 questions on a Tigertest ARRT practice test. Here are 10 of the 24 questions on it, each with the answer and the reason.
Updated by the Tigertest team. Based on the ARRT Radiography Examination Content Specifications. Original questions; 50 per test, weighted like the real exam. Not affiliated with ARRT.
1. Which transformer raises the incoming voltage to the kilovolt level needed by the x-ray tube?
- A.Filament transformer
- B.Step-up transformer
- C.Step-down transformer
- D.Autotransformer
Answer: B. The high-voltage step-up transformer boosts voltage to kilovolts. The autotransformer lets the operator select the kVp before it.
2. Which device lets the operator select kVp?
- A.Rectifier
- B.Filament transformer
- C.Step-up transformer
- D.Autotransformer
Answer: D. The autotransformer works on one winding with adjustable taps, varying the voltage sent to the high-voltage transformer.
3. What is the job of the rectification circuit?
- A.Turn AC into DC
- B.Spin the anode
- C.Raise the tube voltage
- D.Heat the filament
Answer: A. Rectifiers (solid-state diodes) make current flow in one direction through the tube, from cathode to anode.
4. Compared with a single-phase unit, a high-frequency generator has:
- A.Lower average photon energy
- B.No need for rectifiers
- C.Much less voltage ripple
- D.Much more voltage ripple
Answer: C. High-frequency generators have about 1% ripple, so the voltage stays near peak and the beam is more efficient and consistent.
5. What is the job of the filament transformer?
- A.Rectify the current
- B.Time the exposure
- C.Supply low-voltage current
- D.Raise voltage to kVp
Answer: C. The filament circuit uses a step-down transformer to supply low voltage and high current that heats the filament for thermionic emission.
6. In a rotating anode tube, what part of the induction motor sits outside the glass envelope?
- A.Stator
- B.Focusing cup
- C.Target disc
- D.Rotor
Answer: A. The stator coils are outside the envelope and drive the rotor inside it by electromagnetic induction, turning the anode.
7. Why is the anode target made largely of tungsten?
- A.It absorbs scatter
- B.Low cost, light weight
- C.Low Z, low density
- D.High Z, high melting point
Answer: D. Tungsten (Z 74) produces x-rays efficiently and its very high melting point lets it tolerate the heat at the focal spot.
8. What does the line focus principle achieve?
- A.Faster anode rotation
- B.A smaller effective spot
- C.A larger effective spot
- D.Even beam intensity
Answer: B. Angling the target makes the effective focal spot (seen from the receptor) smaller than the area bombarded, improving detail while spreading the heat.
9. What is the purpose of the negatively charged focusing cup?
- A.Speed up the rotor
- B.Narrow the electron stream
- C.Absorb off-focus radiation
- D.Cool the filament
Answer: B. The focusing cup around the filament repels electrons inward so they strike a small area of the target.
10. A three-phase, six-pulse unit makes one exposure at 80 kVp, 400 mA, 0.1 second. How many heat units is that?
- A.4,512 HU
- B.320 HU
- C.3,200 HU
- D.4,320 HU
Answer: D. HU = kVp x mA x s x 1.35 for three-phase six-pulse: 80 x 400 x 0.1 x 1.35 = 4,320. 3,200 leaves out the 1.35 factor.
Practice all 24 equipment operation & qa questions, and the rest of the 200-question bank, in the free ARRT training sets. Questions you miss come back until you have mastered them.
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