MRSO PREP 212 Questions with Complete Solutions

MRSO PREP 212 Questions with Complete Solutions Zero Boil-Off - Correct Answers System that reduces/eliminates the need to recharge Helium in a magnet. Quench - Correct Answers Quickly eliminating the magnetic field. Not immediate, takes 3 to 5 minutes to completely eliminate magnetic field. Loud Noise as Helium rushes out of Quench Vent. Can cause crack in the wire (very costly to repair/replace). Ohm's Law - Correct Answers Resistance that is equal to Voltage divided by the amperage in a wire. V=IR Use of Cryogen reduces/eliminates heating with high voltage and amperage which allows for high magnetic field. Cryogen - Correct Answers Liquid Helium 42* Kelvin Dual Cryogen System - Correct Answers Helium Nitrogen (used to keep Helium cold as back-up) Quench Vent - Correct Answers Used to vent boiled off Helium to the outside. Quench Vent in MRI Room is Zone IV (MRI manufacturer/engineer responsible for inspecting)