Asnt questions download

A type of virtual leak caused by the slow release of absorbed or entrapped tracer gas in a helium mass spectrometer vacuum system is a : a. The sensitivity of a mass spectrometer leak detector system is the mass flow rate of tracer gas : a. As the required sensitivity of a leak test increases, the cost of the test : a. Decreases b. Which of the following can be considered a major class of mass spectrometer leak testing? Out gassing is defined as : a. Vacuum bake-out is defined as the : a.

A material which is included in a vacuum system for removing gas by absorption is called: a. A getter b. A collector c.

An orifice d. A molecularizer The diffusion pump and mechanical forepump in a MSLD system: a. Use the same type of oil b. Use different types of oil c. Operate using the same motor d. Use the same principal of operation Diffusion pumps generally warm up: a. Instantly b. In ten to twenty minutes c. After the system is below 1 mm mercury d. Diffusion pumps do not require warm up www. When calibrating a helium mass spectrometer instrument sensitivity, which one of the following statements is not true?

The condition of the oil in the forepump of a vacuum system is important because: a. The pump will not be lubricated properly b. The limiting forepressure of the diffusion pump may be exceeded c. The water introduced will rust the pump internals d. All of the above The helium mass spectrometer detector probe pressure test technique is : a. When performing a tracer probe mass spectrometer vacuum test, it is desirable to : a.

In vacuum systems, a mechanical pump is used in a series with the diffusion pump because the : a. No damage will occur since the automatic protection system will be activated b. The vacuum system will stay at low vacuum as long as the cold trap remains filled c. Backstreaming of the diffusion pump oil vapors will occur contaminating the system d.

The system will continue to function properly as long as the diffusion pump is operating www. In the normal sequence of starting up a mass spectrometer leak detector unit with a mechanical forepump and diffusion pump, what is the start up sequence? Increasing the length of a tube connecting the mass spectrometer leak detector to an evacuated test object may: a.

When vacuum testing large volumes with a mass spectrometer leak detector, the response and cleanup times depend on : a. Operating the mass spectrometer tube at a pressure greater than that recommended by the manufacturer is undesirable because : a. When connecting an auxiliary vacuum pump system to a test vessel, the pumbing lines should be kept as short as possible because the : a.

The minimum leakage detectable in a helium mass spectrometer leak testing system changes when a continuous parallel vacuum auxiliary pump is used according to the : a.

The accumulation technique of helium mass spectrometer leak testing is a: a. Semiquantitative test b. Static quantitative test c. Qualitative test d. Both b and c It is desirable that a system being helium mass spectrometer leak tested should have: a. A long response time b. A short response time c. A fluctuating time constant d. None of the above When performing a helium mass spectrometer detector probe test technique, it is : a. When using the mass spectrometer leak detector probe test technique, it is : a.

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Of the following, which is considered the most important structural nonferrous metal? Copper b. Zinc c. Tin d.

Aluminium 3. Aluminium cannot be used in most areas where vibrations combine with high stress. There are special care has to be taken to remove all stress raisers. Which below is considered a stress rasier? A notch b. A scratch c. A sudden change of section d.

A notch and a scratch e. All of the above 4. When applying the term annealed to pure aluminium it is interpreted to mean? Work hardenning b. Re-crsytalisation c. Stress releasing d. Normalising 5.

Which NDT method can be used to give general sorting of aluminium alloys? Which metal is most used in electrical work, wiring, etc? Brass c. Aluminium d. Steel 7. It is generally understood that the principal alloying elements of brass 1 are? Copper and tin b. Copper and zinc c.

Bronze and tin d. Tin and zinc 8. Which two NDT methods are usually used to inspect Magnesium components? Radiography and penetrant b. Radiography and magnetic particle c. Ultrasonic and magnetic particle d. Ultrasonic and penetrant 9. Wrought zinc and its alloys have very little NDT inspection on them, when a material is plated with zinc it is known as? Anodizing b. Wrapping c.

Galvanising d. Flashing Thermoplasting can be? Melted down and re-used without loss of properties b. Softened by heat c. Will char when heated d. Melted down and re-used without loss of properties and softened by heat Thermosetting plastics are?

Rigid b. Deteriorated by heat c. Charred by heat d. All of the above Which of the following non-ferrous metals is classed as a light alloy? Which of the metals listed below has the highest strength to weight ratio?

Beryllium b. Titanium c. Zinc One of the major drawbacks of magnesium alloys is? Poor corrosion resistance 2 b. Notch sensitivity c. High density d. More expensive than using beryllium which exhibits similar properties Which of the following non-ferrous metals is almost exclusively diecast? Aluminium b. Copper c. Magnesium d. Cobalt is used as an alloying constituent in? Bearing alloys b. Solders c. Permanent magnets d. Dental alloys Manufacturing is a term used generally to describe the???

Designing b. Production c.