<prompt> True regarding anaesthesia apparatusRotameter reading may not get affected by dirt inside the tubeRotameter reading may not get affected by static electricityThe Boyle machine is an intermittent flow deviceAn oxygen failure safety device operate even in the absences of nitrous oxide  <response>: Oxygen failure safety device operates to detect oxygen supply pressure not N2O pressure. So, if O2 supply pressure is low it operates to interrupt the flow of N2O. 