Question 1

Throughout a period of at least 24 hours, test specimens for air-setting, phosphate-bonded castable refractories are:

Options :

A : air cured, covered.

B : heat cured, uncovered.

C : air cured, uncovered.

D : heat cured, covered.

Answer: C

Question 2

To compose a sample for CCS test from an equivalent number of refractory shapes the specimen should be

Options :

A : at least five

B : at least three

C : at least four

D : None of the above

Answer: A

Question 3

For the qualification of the applicator/installer, they shall demonstrate their ability to install the refractory:

Options :

A : to meet the specified quality standards utilized for the installation of work.

B : by using the technique prescribed by the manufacturer no matter which material is used.

C : free of visible voids, laminations on the hot face or working surface only for gunned lining.

D : free of visible voids, laminations on the hot face or working surface only of the refractory lining.

Answer: A

Question 4

When drying out a unit or vessel that has multiple refractories, schedules should be based on:

Options :

A : the refractory with the highest density in the dryout.

B : extending the hold times by one hour per additional refractory layer.

C : the refractory or lining system that has the longest duration requirement.

D : an average of heating rates and holding times for the refractories and thicknesses being dried out.

Answer: C

Question 5

According to API 936, test specimens are required to be held at oven dry temperature for how many hours?

Options :

A : 1

B : 3

C : 5

D : 12

Answer: D

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