c.a high halogen background.d.a faulty leak-rate meter.Level II 1.Most leaks detected during a halogen sniffer testcould have been detected and usually can be verifiedby:18 2.The presence of small traces of halogen vapors in thehalogen diode detector:3.A halogen standard leak of a certain size produces aknown signal on a halogen leak detector. To receivethis same intensity signal on the instrument duringthe test of an object containing a 2% by volumehalogen-air mixture, the size of the leak in the objectcausing the signal would theoretically have to be atleast times larger than the standard leak.Mass Spectrometer Level I 1.The sensitivity of a mass spectrometer leak detectionsystem is the mass flow rate of tracer gas:a.that gives a maximum measurable signal.b.that gives a minimum measurable signal.c.at standard temperature and pressure.d.in a leak.2.The diffusion pump and mechanical fore pump in amass spectrometer leak detection system:3. The helium mass spectrometer detector-probe pressure-test technique is:
Level ll 1.A torr is defined as:2. 3. When conducting helium mass spectrometer test of a vacuum vessel in the pressure range of 10-4 to IQ-8 mm Hg, which type gage could be used to measure the pressure? a.Alphatron gage.b.Thermionic ionization gage.c.Pirani gage.d.Thermocouple gage.Helium standard leaks in the range of IQ-6 to 10-10 atm cc/s are known in generai terms as: Pressure Change Measurement Level I 1.A pressure of 66.0 psig, in terms of absolute pressureat sea level and standard temperature, would beapproximately:2.When conducting a long-duration pressure changetest, it is necessary to measure absolute pressure orgage pressure plus barometrie pressure because thebarometrie pressure will:3.Which one of the following is the correctrelationship for converting temperature in degreesrankine (0R) to temperature in kelvin (K)?a.K = (5/9) 0Rb.K = (5/9) 0R + 273c.K = 460 + 0Rd.K = 273 °RLevel Il 1.When a system's internal dry bulb's internaltemperature and, in turn, total pressure, increaseduring a pressure change leakage-rate test, the watervapor pressure in the system under test wouldnormally:2.
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