Q. How much of alumina in weight percent is added to silica refractories?

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Q. Mullite is an example of ______ refractory.

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Q. How much silica do silica refractories usually contain?

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Q. Which of the following is a property of fireclay?

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Q. How is the corrosion resistance of high alumina when compared against fireclay?

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Q. What is the hardness of tungsten at room temperature?

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Q. TMZ is an alloy of _______

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Q. Which of the following is not a characteristic of tungsten?

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Q. How can the ductility of tungsten be improved?

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Q. What is the oxidizing temperature of niobium?

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Q. Which phase represents the matrix of the alloy?

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Q. Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of?

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Q. In which temperature range is Gamma Prime phase of nickel-based superalloys unstable?

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Q. TCP phase of nickel-based superalloys are formed at a temperature of _______

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Q. Which of the following is not an effect of adding boron and silicon to superalloys?

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Q. The thermal coating ‘thermally grown oxide’ is formed by the oxidation of _______

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Q. Which of the following applications does a tungsten-carbide coating provide?

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Q. What is the value of dielectric constant of free space?

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Q. What is the unit of polarization?

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Q. How is the dielectric strength denoted as?

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