Question 1

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 2

Cristobalite is an important constituent of

Options :

A : Alumina bricks

B : Silica brick

C : Magnesia brick

D : Insulating brick

Answer: B

Question 3

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 4

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 5

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