Question 1

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

Question 2

For air-setting phosphate bonded, erosion – resistant refractories mixing , the mixer’s paddles and bowls shall be

Options :

A : Aluminium

B : Steel

C : Carbon

D : None of the above

Answer: B

Question 3

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 4

Which of the following is a correct condition for gunned material test panels used for CCS and PLC testing?

Options :

A : Test panels must be 24 in. Ã— 24 in. Ã— 6 in. thick and shot vertically.

B : The minimum gunned thickness shall be 2 in., with a tolerance of ±0.25 in.

C : A vibrating screed must be used during panel finishing.

D : Test panels must be dried at 400°F (204°C) for 6 hours before specimen extraction.

Answer: B

Question 5

As per ASTM C- 704, for the erosion tests, silicon carbide grit to be used by

Options :

A : one time

B : two time

C : three time

D : none of the above

Answer: A

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